drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/cdev.h>
  36 #include <linux/notifier.h>
  37 #include <linux/security.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/dma-mapping.h>
  42 #include <asm/byteorder.h>
  43 #include <linux/moduleparam.h>
  44
  45 #include "usb.h"
  46
  47 #ifdef CONFIG_PM
  48 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  49 #else
  50 #define MAYBE_CAP_SUSPEND       0
  51 #endif
  52
  53 #define USB_MAXBUS                      64
  54 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  55 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  56
  57 /* Mutual exclusion for ps->list in resume vs. release and remove */
  58 static DEFINE_MUTEX(usbfs_mutex);
  59
  60 struct usb_dev_state {
  61         struct list_head list;      /* state list */
  62         struct usb_device *dev;
  63         struct file *file;
  64         spinlock_t lock;            /* protects the async urb lists */
  65         struct list_head async_pending;
  66         struct list_head async_completed;
  67         struct list_head memory_list;
  68         wait_queue_head_t wait;     /* wake up if a request completed */
  69         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         const struct cred *cred;
  73         sigval_t disccontext;
  74         unsigned long ifclaimed;
  75         u32 disabled_bulk_eps;
  76         unsigned long interface_allowed_mask;
  77         int not_yet_resumed;
  78         bool suspend_allowed;
  79         bool privileges_dropped;
  80 };
  81
  82 struct usb_memory {
  83         struct list_head memlist;
  84         int vma_use_count;
  85         int urb_use_count;
  86         u32 size;
  87         void *mem;
  88         dma_addr_t dma_handle;
  89         unsigned long vm_start;
  90         struct usb_dev_state *ps;
  91 };
  92
  93 struct async {
  94         struct list_head asynclist;
  95         struct usb_dev_state *ps;
  96         struct pid *pid;
  97         const struct cred *cred;
  98         unsigned int signr;
  99         unsigned int ifnum;
 100         void __user *userbuffer;
 101         void __user *userurb;
 102         sigval_t userurb_sigval;
 103         struct urb *urb;
 104         struct usb_memory *usbm;
 105         unsigned int mem_usage;
 106         int status;
 107         u8 bulk_addr;
 108         u8 bulk_status;
 109 };
 110
 111 static bool usbfs_snoop;
 112 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 113 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 114
 115 static unsigned usbfs_snoop_max = 65536;
 116 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 117 MODULE_PARM_DESC(usbfs_snoop_max,
 118                 "maximum number of bytes to print while snooping");
 119
 120 #define snoop(dev, format, arg...)                              \
 121         do {                                                    \
 122                 if (usbfs_snoop)                                \
 123                         dev_info(dev, format, ## arg);          \
 124         } while (0)
 125
 126 enum snoop_when {
 127         SUBMIT, COMPLETE
 128 };
 129
 130 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 131
 132 /* Limit on the total amount of memory we can allocate for transfers */
 133 static u32 usbfs_memory_mb = 16;
 134 module_param(usbfs_memory_mb, uint, 0644);
 135 MODULE_PARM_DESC(usbfs_memory_mb,
 136                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 137
 138 /* Hard limit, necessary to avoid arithmetic overflow */
 139 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 140
 141 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 142
 143 /* Check whether it's okay to allocate more memory for a transfer */
 144 static int usbfs_increase_memory_usage(u64 amount)
 145 {
 146         u64 lim;
 147
 148         lim = READ_ONCE(usbfs_memory_mb);
 149         lim <<= 20;
 150
 151         atomic64_add(amount, &usbfs_memory_usage);
 152
 153         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 154                 atomic64_sub(amount, &usbfs_memory_usage);
 155                 return -ENOMEM;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /* Memory for a transfer is being deallocated */
 162 static void usbfs_decrease_memory_usage(u64 amount)
 163 {
 164         atomic64_sub(amount, &usbfs_memory_usage);
 165 }
 166
 167 static int connected(struct usb_dev_state *ps)
 168 {
 169         return (!list_empty(&ps->list) &&
 170                         ps->dev->state != USB_STATE_NOTATTACHED);
 171 }
 172
 173 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 174 {
 175         struct usb_dev_state *ps = usbm->ps;
 176         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 177         unsigned long flags;
 178
 179         spin_lock_irqsave(&ps->lock, flags);
 180         --*count;
 181         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 182                 list_del(&usbm->memlist);
 183                 spin_unlock_irqrestore(&ps->lock, flags);
 184
 185                 hcd_buffer_free_pages(hcd, usbm->size,
 186                                 usbm->mem, usbm->dma_handle);
 187                 usbfs_decrease_memory_usage(
 188                         usbm->size + sizeof(struct usb_memory));
 189                 kfree(usbm);
 190         } else {
 191                 spin_unlock_irqrestore(&ps->lock, flags);
 192         }
 193 }
 194
 195 static void usbdev_vm_open(struct vm_area_struct *vma)
 196 {
 197         struct usb_memory *usbm = vma->vm_private_data;
 198         unsigned long flags;
 199
 200         spin_lock_irqsave(&usbm->ps->lock, flags);
 201         ++usbm->vma_use_count;
 202         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 203 }
 204
 205 static void usbdev_vm_close(struct vm_area_struct *vma)
 206 {
 207         struct usb_memory *usbm = vma->vm_private_data;
 208
 209         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 210 }
 211
 212 static const struct vm_operations_struct usbdev_vm_ops = {
 213         .open = usbdev_vm_open,
 214         .close = usbdev_vm_close
 215 };
 216
 217 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 218 {
 219         struct usb_memory *usbm = NULL;
 220         struct usb_dev_state *ps = file->private_data;
 221         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 222         size_t size = vma->vm_end - vma->vm_start;
 223         void *mem;
 224         unsigned long flags;
 225         dma_addr_t dma_handle = DMA_MAPPING_ERROR;
 226         int ret;
 227
 228         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 229         if (ret)
 230                 goto error;
 231
 232         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 233         if (!usbm) {
 234                 ret = -ENOMEM;
 235                 goto error_decrease_mem;
 236         }
 237
 238         mem = hcd_buffer_alloc_pages(hcd,
 239                         size, GFP_USER | __GFP_NOWARN, &dma_handle);
 240         if (!mem) {
 241                 ret = -ENOMEM;
 242                 goto error_free_usbm;
 243         }
 244
 245         memset(mem, 0, size);
 246
 247         usbm->mem = mem;
 248         usbm->dma_handle = dma_handle;
 249         usbm->size = size;
 250         usbm->ps = ps;
 251         usbm->vm_start = vma->vm_start;
 252         usbm->vma_use_count = 1;
 253         INIT_LIST_HEAD(&usbm->memlist);
 254
 255         /*
 256          * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
 257          * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
 258          * whether we are in such cases, and then use remap_pfn_range (or
 259          * dma_mmap_coherent) to map normal (or DMA) pages into the user
 260          * space, respectively.
 261          */
 262         if (dma_handle == DMA_MAPPING_ERROR) {
 263                 if (remap_pfn_range(vma, vma->vm_start,
 264                                     virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 265                                     size, vma->vm_page_prot) < 0) {
 266                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 267                         return -EAGAIN;
 268                 }
 269         } else {
 270                 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 271                                       size)) {
 272                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 273                         return -EAGAIN;
 274                 }
 275         }
 276
 277         vma->vm_flags |= VM_IO;
 278         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 279         vma->vm_ops = &usbdev_vm_ops;
 280         vma->vm_private_data = usbm;
 281
 282         spin_lock_irqsave(&ps->lock, flags);
 283         list_add_tail(&usbm->memlist, &ps->memory_list);
 284         spin_unlock_irqrestore(&ps->lock, flags);
 285
 286         return 0;
 287
 288 error_free_usbm:
 289         kfree(usbm);
 290 error_decrease_mem:
 291         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 292 error:
 293         return ret;
 294 }
 295
 296 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 297                            loff_t *ppos)
 298 {
 299         struct usb_dev_state *ps = file->private_data;
 300         struct usb_device *dev = ps->dev;
 301         ssize_t ret = 0;
 302         unsigned len;
 303         loff_t pos;
 304         int i;
 305
 306         pos = *ppos;
 307         usb_lock_device(dev);
 308         if (!connected(ps)) {
 309                 ret = -ENODEV;
 310                 goto err;
 311         } else if (pos < 0) {
 312                 ret = -EINVAL;
 313                 goto err;
 314         }
 315
 316         if (pos < sizeof(struct usb_device_descriptor)) {
 317                 /* 18 bytes - fits on the stack */
 318                 struct usb_device_descriptor temp_desc;
 319
 320                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 321                 le16_to_cpus(&temp_desc.bcdUSB);
 322                 le16_to_cpus(&temp_desc.idVendor);
 323                 le16_to_cpus(&temp_desc.idProduct);
 324                 le16_to_cpus(&temp_desc.bcdDevice);
 325
 326                 len = sizeof(struct usb_device_descriptor) - pos;
 327                 if (len > nbytes)
 328                         len = nbytes;
 329                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 330                         ret = -EFAULT;
 331                         goto err;
 332                 }
 333
 334                 *ppos += len;
 335                 buf += len;
 336                 nbytes -= len;
 337                 ret += len;
 338         }
 339
 340         pos = sizeof(struct usb_device_descriptor);
 341         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 342                 struct usb_config_descriptor *config =
 343                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 344                 unsigned int length = le16_to_cpu(config->wTotalLength);
 345
 346                 if (*ppos < pos + length) {
 347
 348                         /* The descriptor may claim to be longer than it
 349                          * really is.  Here is the actual allocated length. */
 350                         unsigned alloclen =
 351                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 352
 353                         len = length - (*ppos - pos);
 354                         if (len > nbytes)
 355                                 len = nbytes;
 356
 357                         /* Simply don't write (skip over) unallocated parts */
 358                         if (alloclen > (*ppos - pos)) {
 359                                 alloclen -= (*ppos - pos);
 360                                 if (copy_to_user(buf,
 361                                     dev->rawdescriptors[i] + (*ppos - pos),
 362                                     min(len, alloclen))) {
 363                                         ret = -EFAULT;
 364                                         goto err;
 365                                 }
 366                         }
 367
 368                         *ppos += len;
 369                         buf += len;
 370                         nbytes -= len;
 371                         ret += len;
 372                 }
 373
 374                 pos += length;
 375         }
 376
 377 err:
 378         usb_unlock_device(dev);
 379         return ret;
 380 }
 381
 382 /*
 383  * async list handling
 384  */
 385
 386 static struct async *alloc_async(unsigned int numisoframes)
 387 {
 388         struct async *as;
 389
 390         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 391         if (!as)
 392                 return NULL;
 393         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 394         if (!as->urb) {
 395                 kfree(as);
 396                 return NULL;
 397         }
 398         return as;
 399 }
 400
 401 static void free_async(struct async *as)
 402 {
 403         int i;
 404
 405         put_pid(as->pid);
 406         if (as->cred)
 407                 put_cred(as->cred);
 408         for (i = 0; i < as->urb->num_sgs; i++) {
 409                 if (sg_page(&as->urb->sg[i]))
 410                         kfree(sg_virt(&as->urb->sg[i]));
 411         }
 412
 413         kfree(as->urb->sg);
 414         if (as->usbm == NULL)
 415                 kfree(as->urb->transfer_buffer);
 416         else
 417                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 418
 419         kfree(as->urb->setup_packet);
 420         usb_free_urb(as->urb);
 421         usbfs_decrease_memory_usage(as->mem_usage);
 422         kfree(as);
 423 }
 424
 425 static void async_newpending(struct async *as)
 426 {
 427         struct usb_dev_state *ps = as->ps;
 428         unsigned long flags;
 429
 430         spin_lock_irqsave(&ps->lock, flags);
 431         list_add_tail(&as->asynclist, &ps->async_pending);
 432         spin_unlock_irqrestore(&ps->lock, flags);
 433 }
 434
 435 static void async_removepending(struct async *as)
 436 {
 437         struct usb_dev_state *ps = as->ps;
 438         unsigned long flags;
 439
 440         spin_lock_irqsave(&ps->lock, flags);
 441         list_del_init(&as->asynclist);
 442         spin_unlock_irqrestore(&ps->lock, flags);
 443 }
 444
 445 static struct async *async_getcompleted(struct usb_dev_state *ps)
 446 {
 447         unsigned long flags;
 448         struct async *as = NULL;
 449
 450         spin_lock_irqsave(&ps->lock, flags);
 451         if (!list_empty(&ps->async_completed)) {
 452                 as = list_entry(ps->async_completed.next, struct async,
 453                                 asynclist);
 454                 list_del_init(&as->asynclist);
 455         }
 456         spin_unlock_irqrestore(&ps->lock, flags);
 457         return as;
 458 }
 459
 460 static struct async *async_getpending(struct usb_dev_state *ps,
 461                                              void __user *userurb)
 462 {
 463         struct async *as;
 464
 465         list_for_each_entry(as, &ps->async_pending, asynclist)
 466                 if (as->userurb == userurb) {
 467                         list_del_init(&as->asynclist);
 468                         return as;
 469                 }
 470
 471         return NULL;
 472 }
 473
 474 static void snoop_urb(struct usb_device *udev,
 475                 void __user *userurb, int pipe, unsigned length,
 476                 int timeout_or_status, enum snoop_when when,
 477                 unsigned char *data, unsigned data_len)
 478 {
 479         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 480         static const char *dirs[] = {"out", "in"};
 481         int ep;
 482         const char *t, *d;
 483
 484         if (!usbfs_snoop)
 485                 return;
 486
 487         ep = usb_pipeendpoint(pipe);
 488         t = types[usb_pipetype(pipe)];
 489         d = dirs[!!usb_pipein(pipe)];
 490
 491         if (userurb) {          /* Async */
 492                 if (when == SUBMIT)
 493                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 494                                         "length %u\n",
 495                                         userurb, ep, t, d, length);
 496                 else
 497                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 498                                         "actual_length %u status %d\n",
 499                                         userurb, ep, t, d, length,
 500                                         timeout_or_status);
 501         } else {
 502                 if (when == SUBMIT)
 503                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 504                                         "timeout %d\n",
 505                                         ep, t, d, length, timeout_or_status);
 506                 else
 507                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 508                                         "status %d\n",
 509                                         ep, t, d, length, timeout_or_status);
 510         }
 511
 512         data_len = min(data_len, usbfs_snoop_max);
 513         if (data && data_len > 0) {
 514                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 515                         data, data_len, 1);
 516         }
 517 }
 518
 519 static void snoop_urb_data(struct urb *urb, unsigned len)
 520 {
 521         int i, size;
 522
 523         len = min(len, usbfs_snoop_max);
 524         if (!usbfs_snoop || len == 0)
 525                 return;
 526
 527         if (urb->num_sgs == 0) {
 528                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 529                         urb->transfer_buffer, len, 1);
 530                 return;
 531         }
 532
 533         for (i = 0; i < urb->num_sgs && len; i++) {
 534                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 535                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 536                         sg_virt(&urb->sg[i]), size, 1);
 537                 len -= size;
 538         }
 539 }
 540
 541 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 542 {
 543         unsigned i, len, size;
 544
 545         if (urb->number_of_packets > 0)         /* Isochronous */
 546                 len = urb->transfer_buffer_length;
 547         else                                    /* Non-Isoc */
 548                 len = urb->actual_length;
 549
 550         if (urb->num_sgs == 0) {
 551                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 552                         return -EFAULT;
 553                 return 0;
 554         }
 555
 556         for (i = 0; i < urb->num_sgs && len; i++) {
 557                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 558                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 559                         return -EFAULT;
 560                 userbuffer += size;
 561                 len -= size;
 562         }
 563
 564         return 0;
 565 }
 566
 567 #define AS_CONTINUATION 1
 568 #define AS_UNLINK       2
 569
 570 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 571 __releases(ps->lock)
 572 __acquires(ps->lock)
 573 {
 574         struct urb *urb;
 575         struct async *as;
 576
 577         /* Mark all the pending URBs that match bulk_addr, up to but not
 578          * including the first one without AS_CONTINUATION.  If such an
 579          * URB is encountered then a new transfer has already started so
 580          * the endpoint doesn't need to be disabled; otherwise it does.
 581          */
 582         list_for_each_entry(as, &ps->async_pending, asynclist) {
 583                 if (as->bulk_addr == bulk_addr) {
 584                         if (as->bulk_status != AS_CONTINUATION)
 585                                 goto rescan;
 586                         as->bulk_status = AS_UNLINK;
 587                         as->bulk_addr = 0;
 588                 }
 589         }
 590         ps->disabled_bulk_eps |= (1 << bulk_addr);
 591
 592         /* Now carefully unlink all the marked pending URBs */
 593  rescan:
 594         list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
 595                 if (as->bulk_status == AS_UNLINK) {
 596                         as->bulk_status = 0;            /* Only once */
 597                         urb = as->urb;
 598                         usb_get_urb(urb);
 599                         spin_unlock(&ps->lock);         /* Allow completions */
 600                         usb_unlink_urb(urb);
 601                         usb_put_urb(urb);
 602                         spin_lock(&ps->lock);
 603                         goto rescan;
 604                 }
 605         }
 606 }
 607
 608 static void async_completed(struct urb *urb)
 609 {
 610         struct async *as = urb->context;
 611         struct usb_dev_state *ps = as->ps;
 612         struct pid *pid = NULL;
 613         const struct cred *cred = NULL;
 614         unsigned long flags;
 615         sigval_t addr;
 616         int signr, errno;
 617
 618         spin_lock_irqsave(&ps->lock, flags);
 619         list_move_tail(&as->asynclist, &ps->async_completed);
 620         as->status = urb->status;
 621         signr = as->signr;
 622         if (signr) {
 623                 errno = as->status;
 624                 addr = as->userurb_sigval;
 625                 pid = get_pid(as->pid);
 626                 cred = get_cred(as->cred);
 627         }
 628         snoop(&urb->dev->dev, "urb complete\n");
 629         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 630                         as->status, COMPLETE, NULL, 0);
 631         if (usb_urb_dir_in(urb))
 632                 snoop_urb_data(urb, urb->actual_length);
 633
 634         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 635                         as->status != -ENOENT)
 636                 cancel_bulk_urbs(ps, as->bulk_addr);
 637
 638         wake_up(&ps->wait);
 639         spin_unlock_irqrestore(&ps->lock, flags);
 640
 641         if (signr) {
 642                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 643                 put_pid(pid);
 644                 put_cred(cred);
 645         }
 646 }
 647
 648 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 649 {
 650         struct urb *urb;
 651         struct async *as;
 652         unsigned long flags;
 653
 654         spin_lock_irqsave(&ps->lock, flags);
 655         while (!list_empty(list)) {
 656                 as = list_last_entry(list, struct async, asynclist);
 657                 list_del_init(&as->asynclist);
 658                 urb = as->urb;
 659                 usb_get_urb(urb);
 660
 661                 /* drop the spinlock so the completion handler can run */
 662                 spin_unlock_irqrestore(&ps->lock, flags);
 663                 usb_kill_urb(urb);
 664                 usb_put_urb(urb);
 665                 spin_lock_irqsave(&ps->lock, flags);
 666         }
 667         spin_unlock_irqrestore(&ps->lock, flags);
 668 }
 669
 670 static void destroy_async_on_interface(struct usb_dev_state *ps,
 671                                        unsigned int ifnum)
 672 {
 673         struct list_head *p, *q, hitlist;
 674         unsigned long flags;
 675
 676         INIT_LIST_HEAD(&hitlist);
 677         spin_lock_irqsave(&ps->lock, flags);
 678         list_for_each_safe(p, q, &ps->async_pending)
 679                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 680                         list_move_tail(p, &hitlist);
 681         spin_unlock_irqrestore(&ps->lock, flags);
 682         destroy_async(ps, &hitlist);
 683 }
 684
 685 static void destroy_all_async(struct usb_dev_state *ps)
 686 {
 687         destroy_async(ps, &ps->async_pending);
 688 }
 689
 690 /*
 691  * interface claims are made only at the request of user level code,
 692  * which can also release them (explicitly or by closing files).
 693  * they're also undone when devices disconnect.
 694  */
 695
 696 static int driver_probe(struct usb_interface *intf,
 697                         const struct usb_device_id *id)
 698 {
 699         return -ENODEV;
 700 }
 701
 702 static void driver_disconnect(struct usb_interface *intf)
 703 {
 704         struct usb_dev_state *ps = usb_get_intfdata(intf);
 705         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 706
 707         if (!ps)
 708                 return;
 709
 710         /* NOTE:  this relies on usbcore having canceled and completed
 711          * all pending I/O requests; 2.6 does that.
 712          */
 713
 714         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 715                 clear_bit(ifnum, &ps->ifclaimed);
 716         else
 717                 dev_warn(&intf->dev, "interface number %u out of range\n",
 718                          ifnum);
 719
 720         usb_set_intfdata(intf, NULL);
 721
 722         /* force async requests to complete */
 723         destroy_async_on_interface(ps, ifnum);
 724 }
 725
 726 /* We don't care about suspend/resume of claimed interfaces */
 727 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 728 {
 729         return 0;
 730 }
 731
 732 static int driver_resume(struct usb_interface *intf)
 733 {
 734         return 0;
 735 }
 736
 737 #ifdef CONFIG_PM
 738 /* The following routines apply to the entire device, not interfaces */
 739 void usbfs_notify_suspend(struct usb_device *udev)
 740 {
 741         /* We don't need to handle this */
 742 }
 743
 744 void usbfs_notify_resume(struct usb_device *udev)
 745 {
 746         struct usb_dev_state *ps;
 747
 748         /* Protect against simultaneous remove or release */
 749         mutex_lock(&usbfs_mutex);
 750         list_for_each_entry(ps, &udev->filelist, list) {
 751                 WRITE_ONCE(ps->not_yet_resumed, 0);
 752                 wake_up_all(&ps->wait_for_resume);
 753         }
 754         mutex_unlock(&usbfs_mutex);
 755 }
 756 #endif
 757
 758 struct usb_driver usbfs_driver = {
 759         .name =         "usbfs",
 760         .probe =        driver_probe,
 761         .disconnect =   driver_disconnect,
 762         .suspend =      driver_suspend,
 763         .resume =       driver_resume,
 764         .supports_autosuspend = 1,
 765 };
 766
 767 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 768 {
 769         struct usb_device *dev = ps->dev;
 770         struct usb_interface *intf;
 771         int err;
 772
 773         if (ifnum >= 8*sizeof(ps->ifclaimed))
 774                 return -EINVAL;
 775         /* already claimed */
 776         if (test_bit(ifnum, &ps->ifclaimed))
 777                 return 0;
 778
 779         if (ps->privileges_dropped &&
 780                         !test_bit(ifnum, &ps->interface_allowed_mask))
 781                 return -EACCES;
 782
 783         intf = usb_ifnum_to_if(dev, ifnum);
 784         if (!intf)
 785                 err = -ENOENT;
 786         else {
 787                 unsigned int old_suppress;
 788
 789                 /* suppress uevents while claiming interface */
 790                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 791                 dev_set_uevent_suppress(&intf->dev, 1);
 792                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 793                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 794         }
 795         if (err == 0)
 796                 set_bit(ifnum, &ps->ifclaimed);
 797         return err;
 798 }
 799
 800 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 801 {
 802         struct usb_device *dev;
 803         struct usb_interface *intf;
 804         int err;
 805
 806         err = -EINVAL;
 807         if (ifnum >= 8*sizeof(ps->ifclaimed))
 808                 return err;
 809         dev = ps->dev;
 810         intf = usb_ifnum_to_if(dev, ifnum);
 811         if (!intf)
 812                 err = -ENOENT;
 813         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 814                 unsigned int old_suppress;
 815
 816                 /* suppress uevents while releasing interface */
 817                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 818                 dev_set_uevent_suppress(&intf->dev, 1);
 819                 usb_driver_release_interface(&usbfs_driver, intf);
 820                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 821                 err = 0;
 822         }
 823         return err;
 824 }
 825
 826 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 827 {
 828         if (ps->dev->state != USB_STATE_CONFIGURED)
 829                 return -EHOSTUNREACH;
 830         if (ifnum >= 8*sizeof(ps->ifclaimed))
 831                 return -EINVAL;
 832         if (test_bit(ifnum, &ps->ifclaimed))
 833                 return 0;
 834         /* if not yet claimed, claim it for the driver */
 835         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 836                  "interface %u before use\n", task_pid_nr(current),
 837                  current->comm, ifnum);
 838         return claimintf(ps, ifnum);
 839 }
 840
 841 static int findintfep(struct usb_device *dev, unsigned int ep)
 842 {
 843         unsigned int i, j, e;
 844         struct usb_interface *intf;
 845         struct usb_host_interface *alts;
 846         struct usb_endpoint_descriptor *endpt;
 847
 848         if (ep & ~(USB_DIR_IN|0xf))
 849                 return -EINVAL;
 850         if (!dev->actconfig)
 851                 return -ESRCH;
 852         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 853                 intf = dev->actconfig->interface[i];
 854                 for (j = 0; j < intf->num_altsetting; j++) {
 855                         alts = &intf->altsetting[j];
 856                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 857                                 endpt = &alts->endpoint[e].desc;
 858                                 if (endpt->bEndpointAddress == ep)
 859                                         return alts->desc.bInterfaceNumber;
 860                         }
 861                 }
 862         }
 863         return -ENOENT;
 864 }
 865
 866 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 867                            unsigned int request, unsigned int index)
 868 {
 869         int ret = 0;
 870         struct usb_host_interface *alt_setting;
 871
 872         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 873          && ps->dev->state != USB_STATE_ADDRESS
 874          && ps->dev->state != USB_STATE_CONFIGURED)
 875                 return -EHOSTUNREACH;
 876         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 877                 return 0;
 878
 879         /*
 880          * check for the special corner case 'get_device_id' in the printer
 881          * class specification, which we always want to allow as it is used
 882          * to query things like ink level, etc.
 883          */
 884         if (requesttype == 0xa1 && request == 0) {
 885                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 886                                                    index >> 8, index & 0xff);
 887                 if (alt_setting
 888                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 889                         return 0;
 890         }
 891
 892         index &= 0xff;
 893         switch (requesttype & USB_RECIP_MASK) {
 894         case USB_RECIP_ENDPOINT:
 895                 if ((index & ~USB_DIR_IN) == 0)
 896                         return 0;
 897                 ret = findintfep(ps->dev, index);
 898                 if (ret < 0) {
 899                         /*
 900                          * Some not fully compliant Win apps seem to get
 901                          * index wrong and have the endpoint number here
 902                          * rather than the endpoint address (with the
 903                          * correct direction). Win does let this through,
 904                          * so we'll not reject it here but leave it to
 905                          * the device to not break KVM. But we warn.
 906                          */
 907                         ret = findintfep(ps->dev, index ^ 0x80);
 908                         if (ret >= 0)
 909                                 dev_info(&ps->dev->dev,
 910                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 911                                         __func__, task_pid_nr(current),
 912                                         current->comm, index, index ^ 0x80);
 913                 }
 914                 if (ret >= 0)
 915                         ret = checkintf(ps, ret);
 916                 break;
 917
 918         case USB_RECIP_INTERFACE:
 919                 ret = checkintf(ps, index);
 920                 break;
 921         }
 922         return ret;
 923 }
 924
 925 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 926                                                      unsigned char ep)
 927 {
 928         if (ep & USB_ENDPOINT_DIR_MASK)
 929                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 930         else
 931                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 932 }
 933
 934 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 935                                   struct usbdevfs_streams __user *streams,
 936                                   unsigned int *num_streams_ret,
 937                                   unsigned int *num_eps_ret,
 938                                   struct usb_host_endpoint ***eps_ret,
 939                                   struct usb_interface **intf_ret)
 940 {
 941         unsigned int i, num_streams, num_eps;
 942         struct usb_host_endpoint **eps;
 943         struct usb_interface *intf = NULL;
 944         unsigned char ep;
 945         int ifnum, ret;
 946
 947         if (get_user(num_streams, &streams->num_streams) ||
 948             get_user(num_eps, &streams->num_eps))
 949                 return -EFAULT;
 950
 951         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 952                 return -EINVAL;
 953
 954         /* The XHCI controller allows max 2 ^ 16 streams */
 955         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 956                 return -EINVAL;
 957
 958         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 959         if (!eps)
 960                 return -ENOMEM;
 961
 962         for (i = 0; i < num_eps; i++) {
 963                 if (get_user(ep, &streams->eps[i])) {
 964                         ret = -EFAULT;
 965                         goto error;
 966                 }
 967                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 968                 if (!eps[i]) {
 969                         ret = -EINVAL;
 970                         goto error;
 971                 }
 972
 973                 /* usb_alloc/free_streams operate on an usb_interface */
 974                 ifnum = findintfep(ps->dev, ep);
 975                 if (ifnum < 0) {
 976                         ret = ifnum;
 977                         goto error;
 978                 }
 979
 980                 if (i == 0) {
 981                         ret = checkintf(ps, ifnum);
 982                         if (ret < 0)
 983                                 goto error;
 984                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 985                 } else {
 986                         /* Verify all eps belong to the same interface */
 987                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 988                                 ret = -EINVAL;
 989                                 goto error;
 990                         }
 991                 }
 992         }
 993
 994         if (num_streams_ret)
 995                 *num_streams_ret = num_streams;
 996         *num_eps_ret = num_eps;
 997         *eps_ret = eps;
 998         *intf_ret = intf;
 999
1000         return 0;
1001
1002 error:
1003         kfree(eps);
1004         return ret;
1005 }
1006
1007 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1008 {
1009         struct device *dev;
1010
1011         dev = bus_find_device_by_devt(&usb_bus_type, devt);
1012         if (!dev)
1013                 return NULL;
1014         return to_usb_device(dev);
1015 }
1016
1017 /*
1018  * file operations
1019  */
1020 static int usbdev_open(struct inode *inode, struct file *file)
1021 {
1022         struct usb_device *dev = NULL;
1023         struct usb_dev_state *ps;
1024         int ret;
1025
1026         ret = -ENOMEM;
1027         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1028         if (!ps)
1029                 goto out_free_ps;
1030
1031         ret = -ENODEV;
1032
1033         /* usbdev device-node */
1034         if (imajor(inode) == USB_DEVICE_MAJOR)
1035                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1036         if (!dev)
1037                 goto out_free_ps;
1038
1039         usb_lock_device(dev);
1040         if (dev->state == USB_STATE_NOTATTACHED)
1041                 goto out_unlock_device;
1042
1043         ret = usb_autoresume_device(dev);
1044         if (ret)
1045                 goto out_unlock_device;
1046
1047         ps->dev = dev;
1048         ps->file = file;
1049         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1050         spin_lock_init(&ps->lock);
1051         INIT_LIST_HEAD(&ps->list);
1052         INIT_LIST_HEAD(&ps->async_pending);
1053         INIT_LIST_HEAD(&ps->async_completed);
1054         INIT_LIST_HEAD(&ps->memory_list);
1055         init_waitqueue_head(&ps->wait);
1056         init_waitqueue_head(&ps->wait_for_resume);
1057         ps->disc_pid = get_pid(task_pid(current));
1058         ps->cred = get_current_cred();
1059         smp_wmb();
1060
1061         /* Can't race with resume; the device is already active */
1062         list_add_tail(&ps->list, &dev->filelist);
1063         file->private_data = ps;
1064         usb_unlock_device(dev);
1065         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1066                         current->comm);
1067         return ret;
1068
1069  out_unlock_device:
1070         usb_unlock_device(dev);
1071         usb_put_dev(dev);
1072  out_free_ps:
1073         kfree(ps);
1074         return ret;
1075 }
1076
1077 static int usbdev_release(struct inode *inode, struct file *file)
1078 {
1079         struct usb_dev_state *ps = file->private_data;
1080         struct usb_device *dev = ps->dev;
1081         unsigned int ifnum;
1082         struct async *as;
1083
1084         usb_lock_device(dev);
1085         usb_hub_release_all_ports(dev, ps);
1086
1087         /* Protect against simultaneous resume */
1088         mutex_lock(&usbfs_mutex);
1089         list_del_init(&ps->list);
1090         mutex_unlock(&usbfs_mutex);
1091
1092         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1093                         ifnum++) {
1094                 if (test_bit(ifnum, &ps->ifclaimed))
1095                         releaseintf(ps, ifnum);
1096         }
1097         destroy_all_async(ps);
1098         if (!ps->suspend_allowed)
1099                 usb_autosuspend_device(dev);
1100         usb_unlock_device(dev);
1101         usb_put_dev(dev);
1102         put_pid(ps->disc_pid);
1103         put_cred(ps->cred);
1104
1105         as = async_getcompleted(ps);
1106         while (as) {
1107                 free_async(as);
1108                 as = async_getcompleted(ps);
1109         }
1110
1111         kfree(ps);
1112         return 0;
1113 }
1114
1115 static int do_proc_control(struct usb_dev_state *ps,
1116                 struct usbdevfs_ctrltransfer *ctrl)
1117 {
1118         struct usb_device *dev = ps->dev;
1119         unsigned int tmo;
1120         unsigned char *tbuf;
1121         unsigned wLength;
1122         int i, pipe, ret;
1123
1124         ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1125                               ctrl->wIndex);
1126         if (ret)
1127                 return ret;
1128         wLength = ctrl->wLength;        /* To suppress 64k PAGE_SIZE warning */
1129         if (wLength > PAGE_SIZE)
1130                 return -EINVAL;
1131         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1132                         sizeof(struct usb_ctrlrequest));
1133         if (ret)
1134                 return ret;
1135         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1136         if (!tbuf) {
1137                 ret = -ENOMEM;
1138                 goto done;
1139         }
1140         tmo = ctrl->timeout;
1141         snoop(&dev->dev, "control urb: bRequestType=%02x "
1142                 "bRequest=%02x wValue=%04x "
1143                 "wIndex=%04x wLength=%04x\n",
1144                 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1145                 ctrl->wIndex, ctrl->wLength);
1146         if ((ctrl->bRequestType & USB_DIR_IN) && ctrl->wLength) {
1147                 pipe = usb_rcvctrlpipe(dev, 0);
1148                 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, NULL, 0);
1149
1150                 usb_unlock_device(dev);
1151                 i = usb_control_msg(dev, pipe, ctrl->bRequest,
1152                                     ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1153                                     tbuf, ctrl->wLength, tmo);
1154                 usb_lock_device(dev);
1155                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1156                           tbuf, max(i, 0));
1157                 if ((i > 0) && ctrl->wLength) {
1158                         if (copy_to_user(ctrl->data, tbuf, i)) {
1159                                 ret = -EFAULT;
1160                                 goto done;
1161                         }
1162                 }
1163         } else {
1164                 if (ctrl->wLength) {
1165                         if (copy_from_user(tbuf, ctrl->data, ctrl->wLength)) {
1166                                 ret = -EFAULT;
1167                                 goto done;
1168                         }
1169                 }
1170                 pipe = usb_sndctrlpipe(dev, 0);
1171                 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT,
1172                         tbuf, ctrl->wLength);
1173
1174                 usb_unlock_device(dev);
1175                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl->bRequest,
1176                                     ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1177                                     tbuf, ctrl->wLength, tmo);
1178                 usb_lock_device(dev);
1179                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1180         }
1181         if (i < 0 && i != -EPIPE) {
1182                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1183                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1184                            current->comm, ctrl->bRequestType, ctrl->bRequest,
1185                            ctrl->wLength, i);
1186         }
1187         ret = i;
1188  done:
1189         free_page((unsigned long) tbuf);
1190         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1191                         sizeof(struct usb_ctrlrequest));
1192         return ret;
1193 }
1194
1195 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1196 {
1197         struct usbdevfs_ctrltransfer ctrl;
1198
1199         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1200                 return -EFAULT;
1201         return do_proc_control(ps, &ctrl);
1202 }
1203
1204 static int do_proc_bulk(struct usb_dev_state *ps,
1205                 struct usbdevfs_bulktransfer *bulk)
1206 {
1207         struct usb_device *dev = ps->dev;
1208         unsigned int tmo, len1, pipe;
1209         int len2;
1210         unsigned char *tbuf;
1211         int i, ret;
1212
1213         ret = findintfep(ps->dev, bulk->ep);
1214         if (ret < 0)
1215                 return ret;
1216         ret = checkintf(ps, ret);
1217         if (ret)
1218                 return ret;
1219         if (bulk->ep & USB_DIR_IN)
1220                 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1221         else
1222                 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1223         if (!usb_maxpacket(dev, pipe, !(bulk->ep & USB_DIR_IN)))
1224                 return -EINVAL;
1225         len1 = bulk->len;
1226         if (len1 >= (INT_MAX - sizeof(struct urb)))
1227                 return -EINVAL;
1228         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1229         if (ret)
1230                 return ret;
1231
1232         /*
1233          * len1 can be almost arbitrarily large.  Don't WARN if it's
1234          * too big, just fail the request.
1235          */
1236         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1237         if (!tbuf) {
1238                 ret = -ENOMEM;
1239                 goto done;
1240         }
1241         tmo = bulk->timeout;
1242         if (bulk->ep & 0x80) {
1243                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1244
1245                 usb_unlock_device(dev);
1246                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1247                 usb_lock_device(dev);
1248                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1249
1250                 if (!i && len2) {
1251                         if (copy_to_user(bulk->data, tbuf, len2)) {
1252                                 ret = -EFAULT;
1253                                 goto done;
1254                         }
1255                 }
1256         } else {
1257                 if (len1) {
1258                         if (copy_from_user(tbuf, bulk->data, len1)) {
1259                                 ret = -EFAULT;
1260                                 goto done;
1261                         }
1262                 }
1263                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1264
1265                 usb_unlock_device(dev);
1266                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1267                 usb_lock_device(dev);
1268                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1269         }
1270         ret = (i < 0 ? i : len2);
1271  done:
1272         kfree(tbuf);
1273         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1274         return ret;
1275 }
1276
1277 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1278 {
1279         struct usbdevfs_bulktransfer bulk;
1280
1281         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1282                 return -EFAULT;
1283         return do_proc_bulk(ps, &bulk);
1284 }
1285
1286 static void check_reset_of_active_ep(struct usb_device *udev,
1287                 unsigned int epnum, char *ioctl_name)
1288 {
1289         struct usb_host_endpoint **eps;
1290         struct usb_host_endpoint *ep;
1291
1292         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1293         ep = eps[epnum & 0x0f];
1294         if (ep && !list_empty(&ep->urb_list))
1295                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1296                                 task_pid_nr(current), current->comm,
1297                                 ioctl_name, epnum);
1298 }
1299
1300 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1301 {
1302         unsigned int ep;
1303         int ret;
1304
1305         if (get_user(ep, (unsigned int __user *)arg))
1306                 return -EFAULT;
1307         ret = findintfep(ps->dev, ep);
1308         if (ret < 0)
1309                 return ret;
1310         ret = checkintf(ps, ret);
1311         if (ret)
1312                 return ret;
1313         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1314         usb_reset_endpoint(ps->dev, ep);
1315         return 0;
1316 }
1317
1318 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1319 {
1320         unsigned int ep;
1321         int pipe;
1322         int ret;
1323
1324         if (get_user(ep, (unsigned int __user *)arg))
1325                 return -EFAULT;
1326         ret = findintfep(ps->dev, ep);
1327         if (ret < 0)
1328                 return ret;
1329         ret = checkintf(ps, ret);
1330         if (ret)
1331                 return ret;
1332         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1333         if (ep & USB_DIR_IN)
1334                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1335         else
1336                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1337
1338         return usb_clear_halt(ps->dev, pipe);
1339 }
1340
1341 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1342 {
1343         struct usbdevfs_getdriver gd;
1344         struct usb_interface *intf;
1345         int ret;
1346
1347         if (copy_from_user(&gd, arg, sizeof(gd)))
1348                 return -EFAULT;
1349         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1350         if (!intf || !intf->dev.driver)
1351                 ret = -ENODATA;
1352         else {
1353                 strlcpy(gd.driver, intf->dev.driver->name,
1354                                 sizeof(gd.driver));
1355                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1356         }
1357         return ret;
1358 }
1359
1360 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1361 {
1362         struct usbdevfs_connectinfo ci;
1363
1364         memset(&ci, 0, sizeof(ci));
1365         ci.devnum = ps->dev->devnum;
1366         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1367
1368         if (copy_to_user(arg, &ci, sizeof(ci)))
1369                 return -EFAULT;
1370         return 0;
1371 }
1372
1373 static int proc_conninfo_ex(struct usb_dev_state *ps,
1374                             void __user *arg, size_t size)
1375 {
1376         struct usbdevfs_conninfo_ex ci;
1377         struct usb_device *udev = ps->dev;
1378
1379         if (size < sizeof(ci.size))
1380                 return -EINVAL;
1381
1382         memset(&ci, 0, sizeof(ci));
1383         ci.size = sizeof(ci);
1384         ci.busnum = udev->bus->busnum;
1385         ci.devnum = udev->devnum;
1386         ci.speed = udev->speed;
1387
1388         while (udev && udev->portnum != 0) {
1389                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1390                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1391                                         udev->portnum;
1392                 udev = udev->parent;
1393         }
1394
1395         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1396                 memmove(&ci.ports[0],
1397                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1398                         ci.num_ports);
1399
1400         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1401                 return -EFAULT;
1402
1403         return 0;
1404 }
1405
1406 static int proc_resetdevice(struct usb_dev_state *ps)
1407 {
1408         struct usb_host_config *actconfig = ps->dev->actconfig;
1409         struct usb_interface *interface;
1410         int i, number;
1411
1412         /* Don't allow a device reset if the process has dropped the
1413          * privilege to do such things and any of the interfaces are
1414          * currently claimed.
1415          */
1416         if (ps->privileges_dropped && actconfig) {
1417                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1418                         interface = actconfig->interface[i];
1419                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1420                         if (usb_interface_claimed(interface) &&
1421                                         !test_bit(number, &ps->ifclaimed)) {
1422                                 dev_warn(&ps->dev->dev,
1423                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1424                                         number, interface->dev.driver->name, current->comm);
1425                                 return -EACCES;
1426                         }
1427                 }
1428         }
1429
1430         return usb_reset_device(ps->dev);
1431 }
1432
1433 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1434 {
1435         struct usbdevfs_setinterface setintf;
1436         int ret;
1437
1438         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1439                 return -EFAULT;
1440         ret = checkintf(ps, setintf.interface);
1441         if (ret)
1442                 return ret;
1443
1444         destroy_async_on_interface(ps, setintf.interface);
1445
1446         return usb_set_interface(ps->dev, setintf.interface,
1447                         setintf.altsetting);
1448 }
1449
1450 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1451 {
1452         int u;
1453         int status = 0;
1454         struct usb_host_config *actconfig;
1455
1456         if (get_user(u, (int __user *)arg))
1457                 return -EFAULT;
1458
1459         actconfig = ps->dev->actconfig;
1460
1461         /* Don't touch the device if any interfaces are claimed.
1462          * It could interfere with other drivers' operations, and if
1463          * an interface is claimed by usbfs it could easily deadlock.
1464          */
1465         if (actconfig) {
1466                 int i;
1467
1468                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1469                         if (usb_interface_claimed(actconfig->interface[i])) {
1470                                 dev_warn(&ps->dev->dev,
1471                                         "usbfs: interface %d claimed by %s "
1472                                         "while '%s' sets config #%d\n",
1473                                         actconfig->interface[i]
1474                                                 ->cur_altsetting
1475                                                 ->desc.bInterfaceNumber,
1476                                         actconfig->interface[i]
1477                                                 ->dev.driver->name,
1478                                         current->comm, u);
1479                                 status = -EBUSY;
1480                                 break;
1481                         }
1482                 }
1483         }
1484
1485         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1486          * so avoid usb_set_configuration()'s kick to sysfs
1487          */
1488         if (status == 0) {
1489                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1490                         status = usb_reset_configuration(ps->dev);
1491                 else
1492                         status = usb_set_configuration(ps->dev, u);
1493         }
1494
1495         return status;
1496 }
1497
1498 static struct usb_memory *
1499 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1500 {
1501         struct usb_memory *usbm = NULL, *iter;
1502         unsigned long flags;
1503         unsigned long uurb_start = (unsigned long)uurb->buffer;
1504
1505         spin_lock_irqsave(&ps->lock, flags);
1506         list_for_each_entry(iter, &ps->memory_list, memlist) {
1507                 if (uurb_start >= iter->vm_start &&
1508                                 uurb_start < iter->vm_start + iter->size) {
1509                         if (uurb->buffer_length > iter->vm_start + iter->size -
1510                                         uurb_start) {
1511                                 usbm = ERR_PTR(-EINVAL);
1512                         } else {
1513                                 usbm = iter;
1514                                 usbm->urb_use_count++;
1515                         }
1516                         break;
1517                 }
1518         }
1519         spin_unlock_irqrestore(&ps->lock, flags);
1520         return usbm;
1521 }
1522
1523 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1524                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1525                         void __user *arg, sigval_t userurb_sigval)
1526 {
1527         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1528         struct usb_host_endpoint *ep;
1529         struct async *as = NULL;
1530         struct usb_ctrlrequest *dr = NULL;
1531         unsigned int u, totlen, isofrmlen;
1532         int i, ret, num_sgs = 0, ifnum = -1;
1533         int number_of_packets = 0;
1534         unsigned int stream_id = 0;
1535         void *buf;
1536         bool is_in;
1537         bool allow_short = false;
1538         bool allow_zero = false;
1539         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1540                                 USBDEVFS_URB_BULK_CONTINUATION |
1541                                 USBDEVFS_URB_NO_FSBR |
1542                                 USBDEVFS_URB_ZERO_PACKET |
1543                                 USBDEVFS_URB_NO_INTERRUPT;
1544         /* USBDEVFS_URB_ISO_ASAP is a special case */
1545         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1546                 mask |= USBDEVFS_URB_ISO_ASAP;
1547
1548         if (uurb->flags & ~mask)
1549                         return -EINVAL;
1550
1551         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1552                 return -EINVAL;
1553         if (uurb->buffer_length > 0 && !uurb->buffer)
1554                 return -EINVAL;
1555         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1556             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1557                 ifnum = findintfep(ps->dev, uurb->endpoint);
1558                 if (ifnum < 0)
1559                         return ifnum;
1560                 ret = checkintf(ps, ifnum);
1561                 if (ret)
1562                         return ret;
1563         }
1564         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1565         if (!ep)
1566                 return -ENOENT;
1567         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1568
1569         u = 0;
1570         switch (uurb->type) {
1571         case USBDEVFS_URB_TYPE_CONTROL:
1572                 if (!usb_endpoint_xfer_control(&ep->desc))
1573                         return -EINVAL;
1574                 /* min 8 byte setup packet */
1575                 if (uurb->buffer_length < 8)
1576                         return -EINVAL;
1577                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1578                 if (!dr)
1579                         return -ENOMEM;
1580                 if (copy_from_user(dr, uurb->buffer, 8)) {
1581                         ret = -EFAULT;
1582                         goto error;
1583                 }
1584                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1585                         ret = -EINVAL;
1586                         goto error;
1587                 }
1588                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1589                                       le16_to_cpu(dr->wIndex));
1590                 if (ret)
1591                         goto error;
1592                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1593                 uurb->buffer += 8;
1594                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1595                         is_in = true;
1596                         uurb->endpoint |= USB_DIR_IN;
1597                 } else {
1598                         is_in = false;
1599                         uurb->endpoint &= ~USB_DIR_IN;
1600                 }
1601                 if (is_in)
1602                         allow_short = true;
1603                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1604                         "bRequest=%02x wValue=%04x "
1605                         "wIndex=%04x wLength=%04x\n",
1606                         dr->bRequestType, dr->bRequest,
1607                         __le16_to_cpu(dr->wValue),
1608                         __le16_to_cpu(dr->wIndex),
1609                         __le16_to_cpu(dr->wLength));
1610                 u = sizeof(struct usb_ctrlrequest);
1611                 break;
1612
1613         case USBDEVFS_URB_TYPE_BULK:
1614                 if (!is_in)
1615                         allow_zero = true;
1616                 else
1617                         allow_short = true;
1618                 switch (usb_endpoint_type(&ep->desc)) {
1619                 case USB_ENDPOINT_XFER_CONTROL:
1620                 case USB_ENDPOINT_XFER_ISOC:
1621                         return -EINVAL;
1622                 case USB_ENDPOINT_XFER_INT:
1623                         /* allow single-shot interrupt transfers */
1624                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1625                         goto interrupt_urb;
1626                 }
1627                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1628                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1629                         num_sgs = 0;
1630                 if (ep->streams)
1631                         stream_id = uurb->stream_id;
1632                 break;
1633
1634         case USBDEVFS_URB_TYPE_INTERRUPT:
1635                 if (!usb_endpoint_xfer_int(&ep->desc))
1636                         return -EINVAL;
1637  interrupt_urb:
1638                 if (!is_in)
1639                         allow_zero = true;
1640                 else
1641                         allow_short = true;
1642                 break;
1643
1644         case USBDEVFS_URB_TYPE_ISO:
1645                 /* arbitrary limit */
1646                 if (uurb->number_of_packets < 1 ||
1647                     uurb->number_of_packets > 128)
1648                         return -EINVAL;
1649                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1650                         return -EINVAL;
1651                 number_of_packets = uurb->number_of_packets;
1652                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1653                                    number_of_packets;
1654                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1655                 if (IS_ERR(isopkt)) {
1656                         ret = PTR_ERR(isopkt);
1657                         isopkt = NULL;
1658                         goto error;
1659                 }
1660                 for (totlen = u = 0; u < number_of_packets; u++) {
1661                         /*
1662                          * arbitrary limit need for USB 3.1 Gen2
1663                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1664                          */
1665                         if (isopkt[u].length > 98304) {
1666                                 ret = -EINVAL;
1667                                 goto error;
1668                         }
1669                         totlen += isopkt[u].length;
1670                 }
1671                 u *= sizeof(struct usb_iso_packet_descriptor);
1672                 uurb->buffer_length = totlen;
1673                 break;
1674
1675         default:
1676                 return -EINVAL;
1677         }
1678
1679         if (uurb->buffer_length > 0 &&
1680                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1681                 ret = -EFAULT;
1682                 goto error;
1683         }
1684         as = alloc_async(number_of_packets);
1685         if (!as) {
1686                 ret = -ENOMEM;
1687                 goto error;
1688         }
1689
1690         as->usbm = find_memory_area(ps, uurb);
1691         if (IS_ERR(as->usbm)) {
1692                 ret = PTR_ERR(as->usbm);
1693                 as->usbm = NULL;
1694                 goto error;
1695         }
1696
1697         /* do not use SG buffers when memory mapped segments
1698          * are in use
1699          */
1700         if (as->usbm)
1701                 num_sgs = 0;
1702
1703         u += sizeof(struct async) + sizeof(struct urb) +
1704              (as->usbm ? 0 : uurb->buffer_length) +
1705              num_sgs * sizeof(struct scatterlist);
1706         ret = usbfs_increase_memory_usage(u);
1707         if (ret)
1708                 goto error;
1709         as->mem_usage = u;
1710
1711         if (num_sgs) {
1712                 as->urb->sg = kmalloc_array(num_sgs,
1713                                             sizeof(struct scatterlist),
1714                                             GFP_KERNEL | __GFP_NOWARN);
1715                 if (!as->urb->sg) {
1716                         ret = -ENOMEM;
1717                         goto error;
1718                 }
1719                 as->urb->num_sgs = num_sgs;
1720                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1721
1722                 totlen = uurb->buffer_length;
1723                 for (i = 0; i < as->urb->num_sgs; i++) {
1724                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1725                         buf = kmalloc(u, GFP_KERNEL);
1726                         if (!buf) {
1727                                 ret = -ENOMEM;
1728                                 goto error;
1729                         }
1730                         sg_set_buf(&as->urb->sg[i], buf, u);
1731
1732                         if (!is_in) {
1733                                 if (copy_from_user(buf, uurb->buffer, u)) {
1734                                         ret = -EFAULT;
1735                                         goto error;
1736                                 }
1737                                 uurb->buffer += u;
1738                         }
1739                         totlen -= u;
1740                 }
1741         } else if (uurb->buffer_length > 0) {
1742                 if (as->usbm) {
1743                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1744
1745                         as->urb->transfer_buffer = as->usbm->mem +
1746                                         (uurb_start - as->usbm->vm_start);
1747                 } else {
1748                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1749                                         GFP_KERNEL | __GFP_NOWARN);
1750                         if (!as->urb->transfer_buffer) {
1751                                 ret = -ENOMEM;
1752                                 goto error;
1753                         }
1754                         if (!is_in) {
1755                                 if (copy_from_user(as->urb->transfer_buffer,
1756                                                    uurb->buffer,
1757                                                    uurb->buffer_length)) {
1758                                         ret = -EFAULT;
1759                                         goto error;
1760                                 }
1761                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1762                                 /*
1763                                  * Isochronous input data may end up being
1764                                  * discontiguous if some of the packets are
1765                                  * short. Clear the buffer so that the gaps
1766                                  * don't leak kernel data to userspace.
1767                                  */
1768                                 memset(as->urb->transfer_buffer, 0,
1769                                                 uurb->buffer_length);
1770                         }
1771                 }
1772         }
1773         as->urb->dev = ps->dev;
1774         as->urb->pipe = (uurb->type << 30) |
1775                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1776                         (uurb->endpoint & USB_DIR_IN);
1777
1778         /* This tedious sequence is necessary because the URB_* flags
1779          * are internal to the kernel and subject to change, whereas
1780          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1781          */
1782         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1783         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1784                 u |= URB_ISO_ASAP;
1785         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1786                 u |= URB_SHORT_NOT_OK;
1787         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1788                 u |= URB_ZERO_PACKET;
1789         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1790                 u |= URB_NO_INTERRUPT;
1791         as->urb->transfer_flags = u;
1792
1793         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1794                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1795         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1796                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1797
1798         as->urb->transfer_buffer_length = uurb->buffer_length;
1799         as->urb->setup_packet = (unsigned char *)dr;
1800         dr = NULL;
1801         as->urb->start_frame = uurb->start_frame;
1802         as->urb->number_of_packets = number_of_packets;
1803         as->urb->stream_id = stream_id;
1804
1805         if (ep->desc.bInterval) {
1806                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1807                                 ps->dev->speed == USB_SPEED_HIGH ||
1808                                 ps->dev->speed >= USB_SPEED_SUPER)
1809                         as->urb->interval = 1 <<
1810                                         min(15, ep->desc.bInterval - 1);
1811                 else
1812                         as->urb->interval = ep->desc.bInterval;
1813         }
1814
1815         as->urb->context = as;
1816         as->urb->complete = async_completed;
1817         for (totlen = u = 0; u < number_of_packets; u++) {
1818                 as->urb->iso_frame_desc[u].offset = totlen;
1819                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1820                 totlen += isopkt[u].length;
1821         }
1822         kfree(isopkt);
1823         isopkt = NULL;
1824         as->ps = ps;
1825         as->userurb = arg;
1826         as->userurb_sigval = userurb_sigval;
1827         if (as->usbm) {
1828                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1829
1830                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1831                 as->urb->transfer_dma = as->usbm->dma_handle +
1832                                 (uurb_start - as->usbm->vm_start);
1833         } else if (is_in && uurb->buffer_length > 0)
1834                 as->userbuffer = uurb->buffer;
1835         as->signr = uurb->signr;
1836         as->ifnum = ifnum;
1837         as->pid = get_pid(task_pid(current));
1838         as->cred = get_current_cred();
1839         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1840                         as->urb->transfer_buffer_length, 0, SUBMIT,
1841                         NULL, 0);
1842         if (!is_in)
1843                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1844
1845         async_newpending(as);
1846
1847         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1848                 spin_lock_irq(&ps->lock);
1849
1850                 /* Not exactly the endpoint address; the direction bit is
1851                  * shifted to the 0x10 position so that the value will be
1852                  * between 0 and 31.
1853                  */
1854                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1855                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1856                                 >> 3);
1857
1858                 /* If this bulk URB is the start of a new transfer, re-enable
1859                  * the endpoint.  Otherwise mark it as a continuation URB.
1860                  */
1861                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1862                         as->bulk_status = AS_CONTINUATION;
1863                 else
1864                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1865
1866                 /* Don't accept continuation URBs if the endpoint is
1867                  * disabled because of an earlier error.
1868                  */
1869                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1870                         ret = -EREMOTEIO;
1871                 else
1872                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1873                 spin_unlock_irq(&ps->lock);
1874         } else {
1875                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1876         }
1877
1878         if (ret) {
1879                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1880                            "usbfs: usb_submit_urb returned %d\n", ret);
1881                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1882                                 0, ret, COMPLETE, NULL, 0);
1883                 async_removepending(as);
1884                 goto error;
1885         }
1886         return 0;
1887
1888  error:
1889         kfree(isopkt);
1890         kfree(dr);
1891         if (as)
1892                 free_async(as);
1893         return ret;
1894 }
1895
1896 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1897 {
1898         struct usbdevfs_urb uurb;
1899         sigval_t userurb_sigval;
1900
1901         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1902                 return -EFAULT;
1903
1904         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1905         userurb_sigval.sival_ptr = arg;
1906
1907         return proc_do_submiturb(ps, &uurb,
1908                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1909                         arg, userurb_sigval);
1910 }
1911
1912 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1913 {
1914         struct urb *urb;
1915         struct async *as;
1916         unsigned long flags;
1917
1918         spin_lock_irqsave(&ps->lock, flags);
1919         as = async_getpending(ps, arg);
1920         if (!as) {
1921                 spin_unlock_irqrestore(&ps->lock, flags);
1922                 return -EINVAL;
1923         }
1924
1925         urb = as->urb;
1926         usb_get_urb(urb);
1927         spin_unlock_irqrestore(&ps->lock, flags);
1928
1929         usb_kill_urb(urb);
1930         usb_put_urb(urb);
1931
1932         return 0;
1933 }
1934
1935 static void compute_isochronous_actual_length(struct urb *urb)
1936 {
1937         unsigned int i;
1938
1939         if (urb->number_of_packets > 0) {
1940                 urb->actual_length = 0;
1941                 for (i = 0; i < urb->number_of_packets; i++)
1942                         urb->actual_length +=
1943                                         urb->iso_frame_desc[i].actual_length;
1944         }
1945 }
1946
1947 static int processcompl(struct async *as, void __user * __user *arg)
1948 {
1949         struct urb *urb = as->urb;
1950         struct usbdevfs_urb __user *userurb = as->userurb;
1951         void __user *addr = as->userurb;
1952         unsigned int i;
1953
1954         compute_isochronous_actual_length(urb);
1955         if (as->userbuffer && urb->actual_length) {
1956                 if (copy_urb_data_to_user(as->userbuffer, urb))
1957                         goto err_out;
1958         }
1959         if (put_user(as->status, &userurb->status))
1960                 goto err_out;
1961         if (put_user(urb->actual_length, &userurb->actual_length))
1962                 goto err_out;
1963         if (put_user(urb->error_count, &userurb->error_count))
1964                 goto err_out;
1965
1966         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1967                 for (i = 0; i < urb->number_of_packets; i++) {
1968                         if (put_user(urb->iso_frame_desc[i].actual_length,
1969                                      &userurb->iso_frame_desc[i].actual_length))
1970                                 goto err_out;
1971                         if (put_user(urb->iso_frame_desc[i].status,
1972                                      &userurb->iso_frame_desc[i].status))
1973                                 goto err_out;
1974                 }
1975         }
1976
1977         if (put_user(addr, (void __user * __user *)arg))
1978                 return -EFAULT;
1979         return 0;
1980
1981 err_out:
1982         return -EFAULT;
1983 }
1984
1985 static struct async *reap_as(struct usb_dev_state *ps)
1986 {
1987         DECLARE_WAITQUEUE(wait, current);
1988         struct async *as = NULL;
1989         struct usb_device *dev = ps->dev;
1990
1991         add_wait_queue(&ps->wait, &wait);
1992         for (;;) {
1993                 __set_current_state(TASK_INTERRUPTIBLE);
1994                 as = async_getcompleted(ps);
1995                 if (as || !connected(ps))
1996                         break;
1997                 if (signal_pending(current))
1998                         break;
1999                 usb_unlock_device(dev);
2000                 schedule();
2001                 usb_lock_device(dev);
2002         }
2003         remove_wait_queue(&ps->wait, &wait);
2004         set_current_state(TASK_RUNNING);
2005         return as;
2006 }
2007
2008 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2009 {
2010         struct async *as = reap_as(ps);
2011
2012         if (as) {
2013                 int retval;
2014
2015                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2016                 retval = processcompl(as, (void __user * __user *)arg);
2017                 free_async(as);
2018                 return retval;
2019         }
2020         if (signal_pending(current))
2021                 return -EINTR;
2022         return -ENODEV;
2023 }
2024
2025 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2026 {
2027         int retval;
2028         struct async *as;
2029
2030         as = async_getcompleted(ps);
2031         if (as) {
2032                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2033                 retval = processcompl(as, (void __user * __user *)arg);
2034                 free_async(as);
2035         } else {
2036                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2037         }
2038         return retval;
2039 }
2040
2041 #ifdef CONFIG_COMPAT
2042 static int proc_control_compat(struct usb_dev_state *ps,
2043                                 struct usbdevfs_ctrltransfer32 __user *p32)
2044 {
2045         struct usbdevfs_ctrltransfer ctrl;
2046         u32 udata;
2047
2048         if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2049             get_user(udata, &p32->data))
2050                 return -EFAULT;
2051         ctrl.data = compat_ptr(udata);
2052         return do_proc_control(ps, &ctrl);
2053 }
2054
2055 static int proc_bulk_compat(struct usb_dev_state *ps,
2056                         struct usbdevfs_bulktransfer32 __user *p32)
2057 {
2058         struct usbdevfs_bulktransfer bulk;
2059         compat_caddr_t addr;
2060
2061         if (get_user(bulk.ep, &p32->ep) ||
2062             get_user(bulk.len, &p32->len) ||
2063             get_user(bulk.timeout, &p32->timeout) ||
2064             get_user(addr, &p32->data))
2065                 return -EFAULT;
2066         bulk.data = compat_ptr(addr);
2067         return do_proc_bulk(ps, &bulk);
2068 }
2069
2070 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2071 {
2072         struct usbdevfs_disconnectsignal32 ds;
2073
2074         if (copy_from_user(&ds, arg, sizeof(ds)))
2075                 return -EFAULT;
2076         ps->discsignr = ds.signr;
2077         ps->disccontext.sival_int = ds.context;
2078         return 0;
2079 }
2080
2081 static int get_urb32(struct usbdevfs_urb *kurb,
2082                      struct usbdevfs_urb32 __user *uurb)
2083 {
2084         struct usbdevfs_urb32 urb32;
2085         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2086                 return -EFAULT;
2087         kurb->type = urb32.type;
2088         kurb->endpoint = urb32.endpoint;
2089         kurb->status = urb32.status;
2090         kurb->flags = urb32.flags;
2091         kurb->buffer = compat_ptr(urb32.buffer);
2092         kurb->buffer_length = urb32.buffer_length;
2093         kurb->actual_length = urb32.actual_length;
2094         kurb->start_frame = urb32.start_frame;
2095         kurb->number_of_packets = urb32.number_of_packets;
2096         kurb->error_count = urb32.error_count;
2097         kurb->signr = urb32.signr;
2098         kurb->usercontext = compat_ptr(urb32.usercontext);
2099         return 0;
2100 }
2101
2102 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2103 {
2104         struct usbdevfs_urb uurb;
2105         sigval_t userurb_sigval;
2106
2107         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2108                 return -EFAULT;
2109
2110         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2111         userurb_sigval.sival_int = ptr_to_compat(arg);
2112
2113         return proc_do_submiturb(ps, &uurb,
2114                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2115                         arg, userurb_sigval);
2116 }
2117
2118 static int processcompl_compat(struct async *as, void __user * __user *arg)
2119 {
2120         struct urb *urb = as->urb;
2121         struct usbdevfs_urb32 __user *userurb = as->userurb;
2122         void __user *addr = as->userurb;
2123         unsigned int i;
2124
2125         compute_isochronous_actual_length(urb);
2126         if (as->userbuffer && urb->actual_length) {
2127                 if (copy_urb_data_to_user(as->userbuffer, urb))
2128                         return -EFAULT;
2129         }
2130         if (put_user(as->status, &userurb->status))
2131                 return -EFAULT;
2132         if (put_user(urb->actual_length, &userurb->actual_length))
2133                 return -EFAULT;
2134         if (put_user(urb->error_count, &userurb->error_count))
2135                 return -EFAULT;
2136
2137         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2138                 for (i = 0; i < urb->number_of_packets; i++) {
2139                         if (put_user(urb->iso_frame_desc[i].actual_length,
2140                                      &userurb->iso_frame_desc[i].actual_length))
2141                                 return -EFAULT;
2142                         if (put_user(urb->iso_frame_desc[i].status,
2143                                      &userurb->iso_frame_desc[i].status))
2144                                 return -EFAULT;
2145                 }
2146         }
2147
2148         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2149                 return -EFAULT;
2150         return 0;
2151 }
2152
2153 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2154 {
2155         struct async *as = reap_as(ps);
2156
2157         if (as) {
2158                 int retval;
2159
2160                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2161                 retval = processcompl_compat(as, (void __user * __user *)arg);
2162                 free_async(as);
2163                 return retval;
2164         }
2165         if (signal_pending(current))
2166                 return -EINTR;
2167         return -ENODEV;
2168 }
2169
2170 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2171 {
2172         int retval;
2173         struct async *as;
2174
2175         as = async_getcompleted(ps);
2176         if (as) {
2177                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2178                 retval = processcompl_compat(as, (void __user * __user *)arg);
2179                 free_async(as);
2180         } else {
2181                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2182         }
2183         return retval;
2184 }
2185
2186
2187 #endif
2188
2189 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2190 {
2191         struct usbdevfs_disconnectsignal ds;
2192
2193         if (copy_from_user(&ds, arg, sizeof(ds)))
2194                 return -EFAULT;
2195         ps->discsignr = ds.signr;
2196         ps->disccontext.sival_ptr = ds.context;
2197         return 0;
2198 }
2199
2200 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2201 {
2202         unsigned int ifnum;
2203
2204         if (get_user(ifnum, (unsigned int __user *)arg))
2205                 return -EFAULT;
2206         return claimintf(ps, ifnum);
2207 }
2208
2209 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2210 {
2211         unsigned int ifnum;
2212         int ret;
2213
2214         if (get_user(ifnum, (unsigned int __user *)arg))
2215                 return -EFAULT;
2216         ret = releaseintf(ps, ifnum);
2217         if (ret < 0)
2218                 return ret;
2219         destroy_async_on_interface(ps, ifnum);
2220         return 0;
2221 }
2222
2223 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2224 {
2225         int                     size;
2226         void                    *buf = NULL;
2227         int                     retval = 0;
2228         struct usb_interface    *intf = NULL;
2229         struct usb_driver       *driver = NULL;
2230
2231         if (ps->privileges_dropped)
2232                 return -EACCES;
2233
2234         if (!connected(ps))
2235                 return -ENODEV;
2236
2237         /* alloc buffer */
2238         size = _IOC_SIZE(ctl->ioctl_code);
2239         if (size > 0) {
2240                 buf = kmalloc(size, GFP_KERNEL);
2241                 if (buf == NULL)
2242                         return -ENOMEM;
2243                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2244                         if (copy_from_user(buf, ctl->data, size)) {
2245                                 kfree(buf);
2246                                 return -EFAULT;
2247                         }
2248                 } else {
2249                         memset(buf, 0, size);
2250                 }
2251         }
2252
2253         if (ps->dev->state != USB_STATE_CONFIGURED)
2254                 retval = -EHOSTUNREACH;
2255         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2256                 retval = -EINVAL;
2257         else switch (ctl->ioctl_code) {
2258
2259         /* disconnect kernel driver from interface */
2260         case USBDEVFS_DISCONNECT:
2261                 if (intf->dev.driver) {
2262                         driver = to_usb_driver(intf->dev.driver);
2263                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2264                         usb_driver_release_interface(driver, intf);
2265                 } else
2266                         retval = -ENODATA;
2267                 break;
2268
2269         /* let kernel drivers try to (re)bind to the interface */
2270         case USBDEVFS_CONNECT:
2271                 if (!intf->dev.driver)
2272                         retval = device_attach(&intf->dev);
2273                 else
2274                         retval = -EBUSY;
2275                 break;
2276
2277         /* talk directly to the interface's driver */
2278         default:
2279                 if (intf->dev.driver)
2280                         driver = to_usb_driver(intf->dev.driver);
2281                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2282                         retval = -ENOTTY;
2283                 } else {
2284                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2285                         if (retval == -ENOIOCTLCMD)
2286                                 retval = -ENOTTY;
2287                 }
2288         }
2289
2290         /* cleanup and return */
2291         if (retval >= 0
2292                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2293                         && size > 0
2294                         && copy_to_user(ctl->data, buf, size) != 0)
2295                 retval = -EFAULT;
2296
2297         kfree(buf);
2298         return retval;
2299 }
2300
2301 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2302 {
2303         struct usbdevfs_ioctl   ctrl;
2304
2305         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2306                 return -EFAULT;
2307         return proc_ioctl(ps, &ctrl);
2308 }
2309
2310 #ifdef CONFIG_COMPAT
2311 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2312 {
2313         struct usbdevfs_ioctl32 ioc32;
2314         struct usbdevfs_ioctl ctrl;
2315
2316         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2317                 return -EFAULT;
2318         ctrl.ifno = ioc32.ifno;
2319         ctrl.ioctl_code = ioc32.ioctl_code;
2320         ctrl.data = compat_ptr(ioc32.data);
2321         return proc_ioctl(ps, &ctrl);
2322 }
2323 #endif
2324
2325 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2326 {
2327         unsigned portnum;
2328         int rc;
2329
2330         if (get_user(portnum, (unsigned __user *) arg))
2331                 return -EFAULT;
2332         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2333         if (rc == 0)
2334                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2335                         portnum, task_pid_nr(current), current->comm);
2336         return rc;
2337 }
2338
2339 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2340 {
2341         unsigned portnum;
2342
2343         if (get_user(portnum, (unsigned __user *) arg))
2344                 return -EFAULT;
2345         return usb_hub_release_port(ps->dev, portnum, ps);
2346 }
2347
2348 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2349 {
2350         __u32 caps;
2351
2352         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2353                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2354                         USBDEVFS_CAP_DROP_PRIVILEGES |
2355                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2356         if (!ps->dev->bus->no_stop_on_short)
2357                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2358         if (ps->dev->bus->sg_tablesize)
2359                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2360
2361         if (put_user(caps, (__u32 __user *)arg))
2362                 return -EFAULT;
2363
2364         return 0;
2365 }
2366
2367 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2368 {
2369         struct usbdevfs_disconnect_claim dc;
2370         struct usb_interface *intf;
2371
2372         if (copy_from_user(&dc, arg, sizeof(dc)))
2373                 return -EFAULT;
2374
2375         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2376         if (!intf)
2377                 return -EINVAL;
2378
2379         if (intf->dev.driver) {
2380                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2381
2382                 if (ps->privileges_dropped)
2383                         return -EACCES;
2384
2385                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2386                                 strncmp(dc.driver, intf->dev.driver->name,
2387                                         sizeof(dc.driver)) != 0)
2388                         return -EBUSY;
2389
2390                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2391                                 strncmp(dc.driver, intf->dev.driver->name,
2392                                         sizeof(dc.driver)) == 0)
2393                         return -EBUSY;
2394
2395                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2396                 usb_driver_release_interface(driver, intf);
2397         }
2398
2399         return claimintf(ps, dc.interface);
2400 }
2401
2402 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2403 {
2404         unsigned num_streams, num_eps;
2405         struct usb_host_endpoint **eps;
2406         struct usb_interface *intf;
2407         int r;
2408
2409         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2410                                    &eps, &intf);
2411         if (r)
2412                 return r;
2413
2414         destroy_async_on_interface(ps,
2415                                    intf->altsetting[0].desc.bInterfaceNumber);
2416
2417         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2418         kfree(eps);
2419         return r;
2420 }
2421
2422 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2423 {
2424         unsigned num_eps;
2425         struct usb_host_endpoint **eps;
2426         struct usb_interface *intf;
2427         int r;
2428
2429         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2430         if (r)
2431                 return r;
2432
2433         destroy_async_on_interface(ps,
2434                                    intf->altsetting[0].desc.bInterfaceNumber);
2435
2436         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2437         kfree(eps);
2438         return r;
2439 }
2440
2441 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2442 {
2443         u32 data;
2444
2445         if (copy_from_user(&data, arg, sizeof(data)))
2446                 return -EFAULT;
2447
2448         /* This is a one way operation. Once privileges are
2449          * dropped, you cannot regain them. You may however reissue
2450          * this ioctl to shrink the allowed interfaces mask.
2451          */
2452         ps->interface_allowed_mask &= data;
2453         ps->privileges_dropped = true;
2454
2455         return 0;
2456 }
2457
2458 static int proc_forbid_suspend(struct usb_dev_state *ps)
2459 {
2460         int ret = 0;
2461
2462         if (ps->suspend_allowed) {
2463                 ret = usb_autoresume_device(ps->dev);
2464                 if (ret == 0)
2465                         ps->suspend_allowed = false;
2466                 else if (ret != -ENODEV)
2467                         ret = -EIO;
2468         }
2469         return ret;
2470 }
2471
2472 static int proc_allow_suspend(struct usb_dev_state *ps)
2473 {
2474         if (!connected(ps))
2475                 return -ENODEV;
2476
2477         WRITE_ONCE(ps->not_yet_resumed, 1);
2478         if (!ps->suspend_allowed) {
2479                 usb_autosuspend_device(ps->dev);
2480                 ps->suspend_allowed = true;
2481         }
2482         return 0;
2483 }
2484
2485 static int proc_wait_for_resume(struct usb_dev_state *ps)
2486 {
2487         int ret;
2488
2489         usb_unlock_device(ps->dev);
2490         ret = wait_event_interruptible(ps->wait_for_resume,
2491                         READ_ONCE(ps->not_yet_resumed) == 0);
2492         usb_lock_device(ps->dev);
2493
2494         if (ret != 0)
2495                 return -EINTR;
2496         return proc_forbid_suspend(ps);
2497 }
2498
2499 /*
2500  * NOTE:  All requests here that have interface numbers as parameters
2501  * are assuming that somehow the configuration has been prevented from
2502  * changing.  But there's no mechanism to ensure that...
2503  */
2504 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2505                                 void __user *p)
2506 {
2507         struct usb_dev_state *ps = file->private_data;
2508         struct inode *inode = file_inode(file);
2509         struct usb_device *dev = ps->dev;
2510         int ret = -ENOTTY;
2511
2512         if (!(file->f_mode & FMODE_WRITE))
2513                 return -EPERM;
2514
2515         usb_lock_device(dev);
2516
2517         /* Reap operations are allowed even after disconnection */
2518         switch (cmd) {
2519         case USBDEVFS_REAPURB:
2520                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2521                 ret = proc_reapurb(ps, p);
2522                 goto done;
2523
2524         case USBDEVFS_REAPURBNDELAY:
2525                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2526                 ret = proc_reapurbnonblock(ps, p);
2527                 goto done;
2528
2529 #ifdef CONFIG_COMPAT
2530         case USBDEVFS_REAPURB32:
2531                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2532                 ret = proc_reapurb_compat(ps, p);
2533                 goto done;
2534
2535         case USBDEVFS_REAPURBNDELAY32:
2536                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2537                 ret = proc_reapurbnonblock_compat(ps, p);
2538                 goto done;
2539 #endif
2540         }
2541
2542         if (!connected(ps)) {
2543                 usb_unlock_device(dev);
2544                 return -ENODEV;
2545         }
2546
2547         switch (cmd) {
2548         case USBDEVFS_CONTROL:
2549                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2550                 ret = proc_control(ps, p);
2551                 if (ret >= 0)
2552                         inode->i_mtime = current_time(inode);
2553                 break;
2554
2555         case USBDEVFS_BULK:
2556                 snoop(&dev->dev, "%s: BULK\n", __func__);
2557                 ret = proc_bulk(ps, p);
2558                 if (ret >= 0)
2559                         inode->i_mtime = current_time(inode);
2560                 break;
2561
2562         case USBDEVFS_RESETEP:
2563                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2564                 ret = proc_resetep(ps, p);
2565                 if (ret >= 0)
2566                         inode->i_mtime = current_time(inode);
2567                 break;
2568
2569         case USBDEVFS_RESET:
2570                 snoop(&dev->dev, "%s: RESET\n", __func__);
2571                 ret = proc_resetdevice(ps);
2572                 break;
2573
2574         case USBDEVFS_CLEAR_HALT:
2575                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2576                 ret = proc_clearhalt(ps, p);
2577                 if (ret >= 0)
2578                         inode->i_mtime = current_time(inode);
2579                 break;
2580
2581         case USBDEVFS_GETDRIVER:
2582                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2583                 ret = proc_getdriver(ps, p);
2584                 break;
2585
2586         case USBDEVFS_CONNECTINFO:
2587                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2588                 ret = proc_connectinfo(ps, p);
2589                 break;
2590
2591         case USBDEVFS_SETINTERFACE:
2592                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2593                 ret = proc_setintf(ps, p);
2594                 break;
2595
2596         case USBDEVFS_SETCONFIGURATION:
2597                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2598                 ret = proc_setconfig(ps, p);
2599                 break;
2600
2601         case USBDEVFS_SUBMITURB:
2602                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2603                 ret = proc_submiturb(ps, p);
2604                 if (ret >= 0)
2605                         inode->i_mtime = current_time(inode);
2606                 break;
2607
2608 #ifdef CONFIG_COMPAT
2609         case USBDEVFS_CONTROL32:
2610                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2611                 ret = proc_control_compat(ps, p);
2612                 if (ret >= 0)
2613                         inode->i_mtime = current_time(inode);
2614                 break;
2615
2616         case USBDEVFS_BULK32:
2617                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2618                 ret = proc_bulk_compat(ps, p);
2619                 if (ret >= 0)
2620                         inode->i_mtime = current_time(inode);
2621                 break;
2622
2623         case USBDEVFS_DISCSIGNAL32:
2624                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2625                 ret = proc_disconnectsignal_compat(ps, p);
2626                 break;
2627
2628         case USBDEVFS_SUBMITURB32:
2629                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2630                 ret = proc_submiturb_compat(ps, p);
2631                 if (ret >= 0)
2632                         inode->i_mtime = current_time(inode);
2633                 break;
2634
2635         case USBDEVFS_IOCTL32:
2636                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2637                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2638                 break;
2639 #endif
2640
2641         case USBDEVFS_DISCARDURB:
2642                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2643                 ret = proc_unlinkurb(ps, p);
2644                 break;
2645
2646         case USBDEVFS_DISCSIGNAL:
2647                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2648                 ret = proc_disconnectsignal(ps, p);
2649                 break;
2650
2651         case USBDEVFS_CLAIMINTERFACE:
2652                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2653                 ret = proc_claiminterface(ps, p);
2654                 break;
2655
2656         case USBDEVFS_RELEASEINTERFACE:
2657                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2658                 ret = proc_releaseinterface(ps, p);
2659                 break;
2660
2661         case USBDEVFS_IOCTL:
2662                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2663                 ret = proc_ioctl_default(ps, p);
2664                 break;
2665
2666         case USBDEVFS_CLAIM_PORT:
2667                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2668                 ret = proc_claim_port(ps, p);
2669                 break;
2670
2671         case USBDEVFS_RELEASE_PORT:
2672                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2673                 ret = proc_release_port(ps, p);
2674                 break;
2675         case USBDEVFS_GET_CAPABILITIES:
2676                 ret = proc_get_capabilities(ps, p);
2677                 break;
2678         case USBDEVFS_DISCONNECT_CLAIM:
2679                 ret = proc_disconnect_claim(ps, p);
2680                 break;
2681         case USBDEVFS_ALLOC_STREAMS:
2682                 ret = proc_alloc_streams(ps, p);
2683                 break;
2684         case USBDEVFS_FREE_STREAMS:
2685                 ret = proc_free_streams(ps, p);
2686                 break;
2687         case USBDEVFS_DROP_PRIVILEGES:
2688                 ret = proc_drop_privileges(ps, p);
2689                 break;
2690         case USBDEVFS_GET_SPEED:
2691                 ret = ps->dev->speed;
2692                 break;
2693         case USBDEVFS_FORBID_SUSPEND:
2694                 ret = proc_forbid_suspend(ps);
2695                 break;
2696         case USBDEVFS_ALLOW_SUSPEND:
2697                 ret = proc_allow_suspend(ps);
2698                 break;
2699         case USBDEVFS_WAIT_FOR_RESUME:
2700                 ret = proc_wait_for_resume(ps);
2701                 break;
2702         }
2703
2704         /* Handle variable-length commands */
2705         switch (cmd & ~IOCSIZE_MASK) {
2706         case USBDEVFS_CONNINFO_EX(0):
2707                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2708                 break;
2709         }
2710
2711  done:
2712         usb_unlock_device(dev);
2713         if (ret >= 0)
2714                 inode->i_atime = current_time(inode);
2715         return ret;
2716 }
2717
2718 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2719                         unsigned long arg)
2720 {
2721         int ret;
2722
2723         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2724
2725         return ret;
2726 }
2727
2728 /* No kernel lock - fine */
2729 static __poll_t usbdev_poll(struct file *file,
2730                                 struct poll_table_struct *wait)
2731 {
2732         struct usb_dev_state *ps = file->private_data;
2733         __poll_t mask = 0;
2734
2735         poll_wait(file, &ps->wait, wait);
2736         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2737                 mask |= EPOLLOUT | EPOLLWRNORM;
2738         if (!connected(ps))
2739                 mask |= EPOLLHUP;
2740         if (list_empty(&ps->list))
2741                 mask |= EPOLLERR;
2742         return mask;
2743 }
2744
2745 const struct file_operations usbdev_file_operations = {
2746         .owner =          THIS_MODULE,
2747         .llseek =         no_seek_end_llseek,
2748         .read =           usbdev_read,
2749         .poll =           usbdev_poll,
2750         .unlocked_ioctl = usbdev_ioctl,
2751         .compat_ioctl =   compat_ptr_ioctl,
2752         .mmap =           usbdev_mmap,
2753         .open =           usbdev_open,
2754         .release =        usbdev_release,
2755 };
2756
2757 static void usbdev_remove(struct usb_device *udev)
2758 {
2759         struct usb_dev_state *ps;
2760
2761         /* Protect against simultaneous resume */
2762         mutex_lock(&usbfs_mutex);
2763         while (!list_empty(&udev->filelist)) {
2764                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2765                 destroy_all_async(ps);
2766                 wake_up_all(&ps->wait);
2767                 WRITE_ONCE(ps->not_yet_resumed, 0);
2768                 wake_up_all(&ps->wait_for_resume);
2769                 list_del_init(&ps->list);
2770                 if (ps->discsignr)
2771                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2772                                              ps->disc_pid, ps->cred);
2773         }
2774         mutex_unlock(&usbfs_mutex);
2775 }
2776
2777 static int usbdev_notify(struct notifier_block *self,
2778                                unsigned long action, void *dev)
2779 {
2780         switch (action) {
2781         case USB_DEVICE_ADD:
2782                 break;
2783         case USB_DEVICE_REMOVE:
2784                 usbdev_remove(dev);
2785                 break;
2786         }
2787         return NOTIFY_OK;
2788 }
2789
2790 static struct notifier_block usbdev_nb = {
2791         .notifier_call =        usbdev_notify,
2792 };
2793
2794 static struct cdev usb_device_cdev;
2795
2796 int __init usb_devio_init(void)
2797 {
2798         int retval;
2799
2800         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2801                                         "usb_device");
2802         if (retval) {
2803                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2804                 goto out;
2805         }
2806         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2807         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2808         if (retval) {
2809                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2810                        USB_DEVICE_MAJOR);
2811                 goto error_cdev;
2812         }
2813         usb_register_notify(&usbdev_nb);
2814 out:
2815         return retval;
2816
2817 error_cdev:
2818         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2819         goto out;
2820 }
2821
2822 void usb_devio_cleanup(void)
2823 {
2824         usb_unregister_notify(&usbdev_nb);
2825         cdev_del(&usb_device_cdev);
2826         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2827 }