drivers/usb/storage/usb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for USB Mass Storage compliant devices
   4  *
   5  * Current development and maintenance by:
   6  *   (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
   7  *
   8  * Developed with the assistance of:
   9  *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
  10  *   (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu)
  11  *
  12  * Initial work by:
  13  *   (c) 1999 Michael Gee (michael@linuxspecific.com)
  14  *
  15  * usb_device_id support by Adam J. Richter (adam@yggdrasil.com):
  16  *   (c) 2000 Yggdrasil Computing, Inc.
  17  *
  18  * This driver is based on the 'USB Mass Storage Class' document. This
  19  * describes in detail the protocol used to communicate with such
  20  * devices.  Clearly, the designers had SCSI and ATAPI commands in
  21  * mind when they created this document.  The commands are all very
  22  * similar to commands in the SCSI-II and ATAPI specifications.
  23  *
  24  * It is important to note that in a number of cases this class
  25  * exhibits class-specific exemptions from the USB specification.
  26  * Notably the usage of NAK, STALL and ACK differs from the norm, in
  27  * that they are used to communicate wait, failed and OK on commands.
  28  *
  29  * Also, for certain devices, the interrupt endpoint is used to convey
  30  * status of a command.
  31  */
  32
  33 #ifdef CONFIG_USB_STORAGE_DEBUG
  34 #define DEBUG
  35 #endif
  36
  37 #include <linux/sched.h>
  38 #include <linux/errno.h>
  39 #include <linux/module.h>
  40 #include <linux/slab.h>
  41 #include <linux/kthread.h>
  42 #include <linux/mutex.h>
  43 #include <linux/utsname.h>
  44
  45 #include <scsi/scsi.h>
  46 #include <scsi/scsi_cmnd.h>
  47 #include <scsi/scsi_device.h>
  48
  49 #include "usb.h"
  50 #include "scsiglue.h"
  51 #include "transport.h"
  52 #include "protocol.h"
  53 #include "debug.h"
  54 #include "initializers.h"
  55
  56 #include "sierra_ms.h"
  57 #include "option_ms.h"
  58
  59 #if IS_ENABLED(CONFIG_USB_UAS)
  60 #include "uas-detect.h"
  61 #endif
  62
  63 #define DRV_NAME "usb-storage"
  64
  65 /* Some informational data */
  66 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
  67 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
  68 MODULE_LICENSE("GPL");
  69
  70 static unsigned int delay_use = 1;
  71 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
  72 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
  73
  74 static char quirks[128];
  75 module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
  76 MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
  77
  78
  79 /*
  80  * The entries in this table correspond, line for line,
  81  * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
  82  */
  83
  84 /*
  85  *The vendor name should be kept at eight characters or less, and
  86  * the product name should be kept at 16 characters or less. If a device
  87  * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
  88  * normally generated by a device through the INQUIRY response will be
  89  * taken from this list, and this is the reason for the above size
  90  * restriction. However, if the flag is not present, then you
  91  * are free to use as many characters as you like.
  92  */
  93
  94 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
  95                     vendor_name, product_name, use_protocol, use_transport, \
  96                     init_function, Flags) \
  97 { \
  98         .vendorName = vendor_name,      \
  99         .productName = product_name,    \
 100         .useProtocol = use_protocol,    \
 101         .useTransport = use_transport,  \
 102         .initFunction = init_function,  \
 103 }
 104
 105 #define COMPLIANT_DEV   UNUSUAL_DEV
 106
 107 #define USUAL_DEV(use_protocol, use_transport) \
 108 { \
 109         .useProtocol = use_protocol,    \
 110         .useTransport = use_transport,  \
 111 }
 112
 113 #define UNUSUAL_VENDOR_INTF(idVendor, cl, sc, pr, \
 114                 vendor_name, product_name, use_protocol, use_transport, \
 115                 init_function, Flags) \
 116 { \
 117         .vendorName = vendor_name,      \
 118         .productName = product_name,    \
 119         .useProtocol = use_protocol,    \
 120         .useTransport = use_transport,  \
 121         .initFunction = init_function,  \
 122 }
 123
 124 static struct us_unusual_dev us_unusual_dev_list[] = {
 125 #       include "unusual_devs.h"
 126         { }             /* Terminating entry */
 127 };
 128
 129 static struct us_unusual_dev for_dynamic_ids =
 130                 USUAL_DEV(USB_SC_SCSI, USB_PR_BULK);
 131
 132 #undef UNUSUAL_DEV
 133 #undef COMPLIANT_DEV
 134 #undef USUAL_DEV
 135 #undef UNUSUAL_VENDOR_INTF
 136
 137 #ifdef CONFIG_LOCKDEP
 138
 139 static struct lock_class_key us_interface_key[USB_MAXINTERFACES];
 140
 141 static void us_set_lock_class(struct mutex *mutex,
 142                 struct usb_interface *intf)
 143 {
 144         struct usb_device *udev = interface_to_usbdev(intf);
 145         struct usb_host_config *config = udev->actconfig;
 146         int i;
 147
 148         for (i = 0; i < config->desc.bNumInterfaces; i++) {
 149                 if (config->interface[i] == intf)
 150                         break;
 151         }
 152
 153         BUG_ON(i == config->desc.bNumInterfaces);
 154
 155         lockdep_set_class(mutex, &us_interface_key[i]);
 156 }
 157
 158 #else
 159
 160 static void us_set_lock_class(struct mutex *mutex,
 161                 struct usb_interface *intf)
 162 {
 163 }
 164
 165 #endif
 166
 167 #ifdef CONFIG_PM        /* Minimal support for suspend and resume */
 168
 169 int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
 170 {
 171         struct us_data *us = usb_get_intfdata(iface);
 172
 173         /* Wait until no command is running */
 174         mutex_lock(&us->dev_mutex);
 175
 176         if (us->suspend_resume_hook)
 177                 (us->suspend_resume_hook)(us, US_SUSPEND);
 178
 179         /*
 180          * When runtime PM is working, we'll set a flag to indicate
 181          * whether we should autoresume when a SCSI request arrives.
 182          */
 183
 184         mutex_unlock(&us->dev_mutex);
 185         return 0;
 186 }
 187 EXPORT_SYMBOL_GPL(usb_stor_suspend);
 188
 189 int usb_stor_resume(struct usb_interface *iface)
 190 {
 191         struct us_data *us = usb_get_intfdata(iface);
 192
 193         mutex_lock(&us->dev_mutex);
 194
 195         if (us->suspend_resume_hook)
 196                 (us->suspend_resume_hook)(us, US_RESUME);
 197
 198         mutex_unlock(&us->dev_mutex);
 199         return 0;
 200 }
 201 EXPORT_SYMBOL_GPL(usb_stor_resume);
 202
 203 int usb_stor_reset_resume(struct usb_interface *iface)
 204 {
 205         struct us_data *us = usb_get_intfdata(iface);
 206
 207         /* Report the reset to the SCSI core */
 208         usb_stor_report_bus_reset(us);
 209
 210         /*
 211          * If any of the subdrivers implemented a reinitialization scheme,
 212          * this is where the callback would be invoked.
 213          */
 214         return 0;
 215 }
 216 EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
 217
 218 #endif /* CONFIG_PM */
 219
 220 /*
 221  * The next two routines get called just before and just after
 222  * a USB port reset, whether from this driver or a different one.
 223  */
 224
 225 int usb_stor_pre_reset(struct usb_interface *iface)
 226 {
 227         struct us_data *us = usb_get_intfdata(iface);
 228
 229         /* Make sure no command runs during the reset */
 230         mutex_lock(&us->dev_mutex);
 231         return 0;
 232 }
 233 EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
 234
 235 int usb_stor_post_reset(struct usb_interface *iface)
 236 {
 237         struct us_data *us = usb_get_intfdata(iface);
 238
 239         /* Report the reset to the SCSI core */
 240         usb_stor_report_bus_reset(us);
 241
 242         /*
 243          * If any of the subdrivers implemented a reinitialization scheme,
 244          * this is where the callback would be invoked.
 245          */
 246
 247         mutex_unlock(&us->dev_mutex);
 248         return 0;
 249 }
 250 EXPORT_SYMBOL_GPL(usb_stor_post_reset);
 251
 252 /*
 253  * fill_inquiry_response takes an unsigned char array (which must
 254  * be at least 36 characters) and populates the vendor name,
 255  * product name, and revision fields. Then the array is copied
 256  * into the SCSI command's response buffer (oddly enough
 257  * called request_buffer). data_len contains the length of the
 258  * data array, which again must be at least 36.
 259  */
 260
 261 void fill_inquiry_response(struct us_data *us, unsigned char *data,
 262                 unsigned int data_len)
 263 {
 264         if (data_len < 36) /* You lose. */
 265                 return;
 266
 267         memset(data+8, ' ', 28);
 268         if (data[0]&0x20) { /*
 269                              * USB device currently not connected. Return
 270                              * peripheral qualifier 001b ("...however, the
 271                              * physical device is not currently connected
 272                              * to this logical unit") and leave vendor and
 273                              * product identification empty. ("If the target
 274                              * does store some of the INQUIRY data on the
 275                              * device, it may return zeros or ASCII spaces
 276                              * (20h) in those fields until the data is
 277                              * available from the device.").
 278                              */
 279         } else {
 280                 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
 281                 int n;
 282
 283                 n = strlen(us->unusual_dev->vendorName);
 284                 memcpy(data+8, us->unusual_dev->vendorName, min(8, n));
 285                 n = strlen(us->unusual_dev->productName);
 286                 memcpy(data+16, us->unusual_dev->productName, min(16, n));
 287
 288                 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
 289                 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
 290                 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
 291                 data[35] = 0x30 + ((bcdDevice) & 0x0F);
 292         }
 293
 294         usb_stor_set_xfer_buf(data, data_len, us->srb);
 295 }
 296 EXPORT_SYMBOL_GPL(fill_inquiry_response);
 297
 298 static int usb_stor_control_thread(void * __us)
 299 {
 300         struct us_data *us = (struct us_data *)__us;
 301         struct Scsi_Host *host = us_to_host(us);
 302         struct scsi_cmnd *srb;
 303
 304         for (;;) {
 305                 usb_stor_dbg(us, "*** thread sleeping\n");
 306                 if (wait_for_completion_interruptible(&us->cmnd_ready))
 307                         break;
 308
 309                 usb_stor_dbg(us, "*** thread awakened\n");
 310
 311                 /* lock the device pointers */
 312                 mutex_lock(&(us->dev_mutex));
 313
 314                 /* lock access to the state */
 315                 scsi_lock(host);
 316
 317                 /* When we are called with no command pending, we're done */
 318                 srb = us->srb;
 319                 if (srb == NULL) {
 320                         scsi_unlock(host);
 321                         mutex_unlock(&us->dev_mutex);
 322                         usb_stor_dbg(us, "-- exiting\n");
 323                         break;
 324                 }
 325
 326                 /* has the command timed out *already* ? */
 327                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 328                         srb->result = DID_ABORT << 16;
 329                         goto SkipForAbort;
 330                 }
 331
 332                 scsi_unlock(host);
 333
 334                 /*
 335                  * reject the command if the direction indicator
 336                  * is UNKNOWN
 337                  */
 338                 if (srb->sc_data_direction == DMA_BIDIRECTIONAL) {
 339                         usb_stor_dbg(us, "UNKNOWN data direction\n");
 340                         srb->result = DID_ERROR << 16;
 341                 }
 342
 343                 /*
 344                  * reject if target != 0 or if LUN is higher than
 345                  * the maximum known LUN
 346                  */
 347                 else if (srb->device->id &&
 348                                 !(us->fflags & US_FL_SCM_MULT_TARG)) {
 349                         usb_stor_dbg(us, "Bad target number (%d:%llu)\n",
 350                                      srb->device->id,
 351                                      srb->device->lun);
 352                         srb->result = DID_BAD_TARGET << 16;
 353                 }
 354
 355                 else if (srb->device->lun > us->max_lun) {
 356                         usb_stor_dbg(us, "Bad LUN (%d:%llu)\n",
 357                                      srb->device->id,
 358                                      srb->device->lun);
 359                         srb->result = DID_BAD_TARGET << 16;
 360                 }
 361
 362                 /*
 363                  * Handle those devices which need us to fake
 364                  * their inquiry data
 365                  */
 366                 else if ((srb->cmnd[0] == INQUIRY) &&
 367                             (us->fflags & US_FL_FIX_INQUIRY)) {
 368                         unsigned char data_ptr[36] = {
 369                             0x00, 0x80, 0x02, 0x02,
 370                             0x1F, 0x00, 0x00, 0x00};
 371
 372                         usb_stor_dbg(us, "Faking INQUIRY command\n");
 373                         fill_inquiry_response(us, data_ptr, 36);
 374                         srb->result = SAM_STAT_GOOD;
 375                 }
 376
 377                 /* we've got a command, let's do it! */
 378                 else {
 379                         US_DEBUG(usb_stor_show_command(us, srb));
 380                         us->proto_handler(srb, us);
 381                         usb_mark_last_busy(us->pusb_dev);
 382                 }
 383
 384                 /* lock access to the state */
 385                 scsi_lock(host);
 386
 387                 /* was the command aborted? */
 388                 if (srb->result == DID_ABORT << 16) {
 389 SkipForAbort:
 390                         usb_stor_dbg(us, "scsi command aborted\n");
 391                         srb = NULL;     /* Don't call srb->scsi_done() */
 392                 }
 393
 394                 /*
 395                  * If an abort request was received we need to signal that
 396                  * the abort has finished.  The proper test for this is
 397                  * the TIMED_OUT flag, not srb->result == DID_ABORT, because
 398                  * the timeout might have occurred after the command had
 399                  * already completed with a different result code.
 400                  */
 401                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 402                         complete(&(us->notify));
 403
 404                         /* Allow USB transfers to resume */
 405                         clear_bit(US_FLIDX_ABORTING, &us->dflags);
 406                         clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
 407                 }
 408
 409                 /* finished working on this command */
 410                 us->srb = NULL;
 411                 scsi_unlock(host);
 412
 413                 /* unlock the device pointers */
 414                 mutex_unlock(&us->dev_mutex);
 415
 416                 /* now that the locks are released, notify the SCSI core */
 417                 if (srb) {
 418                         usb_stor_dbg(us, "scsi cmd done, result=0x%x\n",
 419                                         srb->result);
 420                         srb->scsi_done(srb);
 421                 }
 422         } /* for (;;) */
 423
 424         /* Wait until we are told to stop */
 425         for (;;) {
 426                 set_current_state(TASK_INTERRUPTIBLE);
 427                 if (kthread_should_stop())
 428                         break;
 429                 schedule();
 430         }
 431         __set_current_state(TASK_RUNNING);
 432         return 0;
 433 }
 434
 435 /***********************************************************************
 436  * Device probing and disconnecting
 437  ***********************************************************************/
 438
 439 /* Associate our private data with the USB device */
 440 static int associate_dev(struct us_data *us, struct usb_interface *intf)
 441 {
 442         /* Fill in the device-related fields */
 443         us->pusb_dev = interface_to_usbdev(intf);
 444         us->pusb_intf = intf;
 445         us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 446         usb_stor_dbg(us, "Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
 447                      le16_to_cpu(us->pusb_dev->descriptor.idVendor),
 448                      le16_to_cpu(us->pusb_dev->descriptor.idProduct),
 449                      le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
 450         usb_stor_dbg(us, "Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
 451                      intf->cur_altsetting->desc.bInterfaceSubClass,
 452                      intf->cur_altsetting->desc.bInterfaceProtocol);
 453
 454         /* Store our private data in the interface */
 455         usb_set_intfdata(intf, us);
 456
 457         /* Allocate the control/setup and DMA-mapped buffers */
 458         us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
 459         if (!us->cr)
 460                 return -ENOMEM;
 461
 462         us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE,
 463                         GFP_KERNEL, &us->iobuf_dma);
 464         if (!us->iobuf) {
 465                 usb_stor_dbg(us, "I/O buffer allocation failed\n");
 466                 return -ENOMEM;
 467         }
 468         return 0;
 469 }
 470
 471 /* Works only for digits and letters, but small and fast */
 472 #define TOLOWER(x) ((x) | 0x20)
 473
 474 /* Adjust device flags based on the "quirks=" module parameter */
 475 void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags)
 476 {
 477         char *p;
 478         u16 vid = le16_to_cpu(udev->descriptor.idVendor);
 479         u16 pid = le16_to_cpu(udev->descriptor.idProduct);
 480         unsigned f = 0;
 481         unsigned int mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE |
 482                         US_FL_FIX_CAPACITY | US_FL_IGNORE_UAS |
 483                         US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
 484                         US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
 485                         US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
 486                         US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
 487                         US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
 488                         US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE |
 489                         US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES |
 490                         US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS |
 491                         US_FL_ALWAYS_SYNC);
 492
 493         p = quirks;
 494         while (*p) {
 495                 /* Each entry consists of VID:PID:flags */
 496                 if (vid == simple_strtoul(p, &p, 16) &&
 497                                 *p == ':' &&
 498                                 pid == simple_strtoul(p+1, &p, 16) &&
 499                                 *p == ':')
 500                         break;
 501
 502                 /* Move forward to the next entry */
 503                 while (*p) {
 504                         if (*p++ == ',')
 505                                 break;
 506                 }
 507         }
 508         if (!*p)        /* No match */
 509                 return;
 510
 511         /* Collect the flags */
 512         while (*++p && *p != ',') {
 513                 switch (TOLOWER(*p)) {
 514                 case 'a':
 515                         f |= US_FL_SANE_SENSE;
 516                         break;
 517                 case 'b':
 518                         f |= US_FL_BAD_SENSE;
 519                         break;
 520                 case 'c':
 521                         f |= US_FL_FIX_CAPACITY;
 522                         break;
 523                 case 'd':
 524                         f |= US_FL_NO_READ_DISC_INFO;
 525                         break;
 526                 case 'e':
 527                         f |= US_FL_NO_READ_CAPACITY_16;
 528                         break;
 529                 case 'f':
 530                         f |= US_FL_NO_REPORT_OPCODES;
 531                         break;
 532                 case 'g':
 533                         f |= US_FL_MAX_SECTORS_240;
 534                         break;
 535                 case 'h':
 536                         f |= US_FL_CAPACITY_HEURISTICS;
 537                         break;
 538                 case 'i':
 539                         f |= US_FL_IGNORE_DEVICE;
 540                         break;
 541                 case 'j':
 542                         f |= US_FL_NO_REPORT_LUNS;
 543                         break;
 544                 case 'k':
 545                         f |= US_FL_NO_SAME;
 546                         break;
 547                 case 'l':
 548                         f |= US_FL_NOT_LOCKABLE;
 549                         break;
 550                 case 'm':
 551                         f |= US_FL_MAX_SECTORS_64;
 552                         break;
 553                 case 'n':
 554                         f |= US_FL_INITIAL_READ10;
 555                         break;
 556                 case 'o':
 557                         f |= US_FL_CAPACITY_OK;
 558                         break;
 559                 case 'p':
 560                         f |= US_FL_WRITE_CACHE;
 561                         break;
 562                 case 'r':
 563                         f |= US_FL_IGNORE_RESIDUE;
 564                         break;
 565                 case 's':
 566                         f |= US_FL_SINGLE_LUN;
 567                         break;
 568                 case 't':
 569                         f |= US_FL_NO_ATA_1X;
 570                         break;
 571                 case 'u':
 572                         f |= US_FL_IGNORE_UAS;
 573                         break;
 574                 case 'w':
 575                         f |= US_FL_NO_WP_DETECT;
 576                         break;
 577                 case 'y':
 578                         f |= US_FL_ALWAYS_SYNC;
 579                         break;
 580                 /* Ignore unrecognized flag characters */
 581                 }
 582         }
 583         *fflags = (*fflags & ~mask) | f;
 584 }
 585 EXPORT_SYMBOL_GPL(usb_stor_adjust_quirks);
 586
 587 /* Get the unusual_devs entries and the string descriptors */
 588 static int get_device_info(struct us_data *us, const struct usb_device_id *id,
 589                 struct us_unusual_dev *unusual_dev)
 590 {
 591         struct usb_device *dev = us->pusb_dev;
 592         struct usb_interface_descriptor *idesc =
 593                 &us->pusb_intf->cur_altsetting->desc;
 594         struct device *pdev = &us->pusb_intf->dev;
 595
 596         /* Store the entries */
 597         us->unusual_dev = unusual_dev;
 598         us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ?
 599                         idesc->bInterfaceSubClass :
 600                         unusual_dev->useProtocol;
 601         us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ?
 602                         idesc->bInterfaceProtocol :
 603                         unusual_dev->useTransport;
 604         us->fflags = id->driver_info;
 605         usb_stor_adjust_quirks(us->pusb_dev, &us->fflags);
 606
 607         if (us->fflags & US_FL_IGNORE_DEVICE) {
 608                 dev_info(pdev, "device ignored\n");
 609                 return -ENODEV;
 610         }
 611
 612         /*
 613          * This flag is only needed when we're in high-speed, so let's
 614          * disable it if we're in full-speed
 615          */
 616         if (dev->speed != USB_SPEED_HIGH)
 617                 us->fflags &= ~US_FL_GO_SLOW;
 618
 619         if (us->fflags)
 620                 dev_info(pdev, "Quirks match for vid %04x pid %04x: %lx\n",
 621                                 le16_to_cpu(dev->descriptor.idVendor),
 622                                 le16_to_cpu(dev->descriptor.idProduct),
 623                                 us->fflags);
 624
 625         /*
 626          * Log a message if a non-generic unusual_dev entry contains an
 627          * unnecessary subclass or protocol override.  This may stimulate
 628          * reports from users that will help us remove unneeded entries
 629          * from the unusual_devs.h table.
 630          */
 631         if (id->idVendor || id->idProduct) {
 632                 static const char *msgs[3] = {
 633                         "an unneeded SubClass entry",
 634                         "an unneeded Protocol entry",
 635                         "unneeded SubClass and Protocol entries"};
 636                 struct usb_device_descriptor *ddesc = &dev->descriptor;
 637                 int msg = -1;
 638
 639                 if (unusual_dev->useProtocol != USB_SC_DEVICE &&
 640                         us->subclass == idesc->bInterfaceSubClass)
 641                         msg += 1;
 642                 if (unusual_dev->useTransport != USB_PR_DEVICE &&
 643                         us->protocol == idesc->bInterfaceProtocol)
 644                         msg += 2;
 645                 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
 646                         dev_notice(pdev, "This device "
 647                                         "(%04x,%04x,%04x S %02x P %02x)"
 648                                         " has %s in unusual_devs.h (kernel"
 649                                         " %s)\n"
 650                                         "   Please send a copy of this message to "
 651                                         "<linux-usb@vger.kernel.org> and "
 652                                         "<usb-storage@lists.one-eyed-alien.net>\n",
 653                                         le16_to_cpu(ddesc->idVendor),
 654                                         le16_to_cpu(ddesc->idProduct),
 655                                         le16_to_cpu(ddesc->bcdDevice),
 656                                         idesc->bInterfaceSubClass,
 657                                         idesc->bInterfaceProtocol,
 658                                         msgs[msg],
 659                                         utsname()->release);
 660         }
 661
 662         return 0;
 663 }
 664
 665 /* Get the transport settings */
 666 static void get_transport(struct us_data *us)
 667 {
 668         switch (us->protocol) {
 669         case USB_PR_CB:
 670                 us->transport_name = "Control/Bulk";
 671                 us->transport = usb_stor_CB_transport;
 672                 us->transport_reset = usb_stor_CB_reset;
 673                 us->max_lun = 7;
 674                 break;
 675
 676         case USB_PR_CBI:
 677                 us->transport_name = "Control/Bulk/Interrupt";
 678                 us->transport = usb_stor_CB_transport;
 679                 us->transport_reset = usb_stor_CB_reset;
 680                 us->max_lun = 7;
 681                 break;
 682
 683         case USB_PR_BULK:
 684                 us->transport_name = "Bulk";
 685                 us->transport = usb_stor_Bulk_transport;
 686                 us->transport_reset = usb_stor_Bulk_reset;
 687                 break;
 688         }
 689 }
 690
 691 /* Get the protocol settings */
 692 static void get_protocol(struct us_data *us)
 693 {
 694         switch (us->subclass) {
 695         case USB_SC_RBC:
 696                 us->protocol_name = "Reduced Block Commands (RBC)";
 697                 us->proto_handler = usb_stor_transparent_scsi_command;
 698                 break;
 699
 700         case USB_SC_8020:
 701                 us->protocol_name = "8020i";
 702                 us->proto_handler = usb_stor_pad12_command;
 703                 us->max_lun = 0;
 704                 break;
 705
 706         case USB_SC_QIC:
 707                 us->protocol_name = "QIC-157";
 708                 us->proto_handler = usb_stor_pad12_command;
 709                 us->max_lun = 0;
 710                 break;
 711
 712         case USB_SC_8070:
 713                 us->protocol_name = "8070i";
 714                 us->proto_handler = usb_stor_pad12_command;
 715                 us->max_lun = 0;
 716                 break;
 717
 718         case USB_SC_SCSI:
 719                 us->protocol_name = "Transparent SCSI";
 720                 us->proto_handler = usb_stor_transparent_scsi_command;
 721                 break;
 722
 723         case USB_SC_UFI:
 724                 us->protocol_name = "Uniform Floppy Interface (UFI)";
 725                 us->proto_handler = usb_stor_ufi_command;
 726                 break;
 727         }
 728 }
 729
 730 /* Get the pipe settings */
 731 static int get_pipes(struct us_data *us)
 732 {
 733         struct usb_host_interface *alt = us->pusb_intf->cur_altsetting;
 734         struct usb_endpoint_descriptor *ep_in;
 735         struct usb_endpoint_descriptor *ep_out;
 736         struct usb_endpoint_descriptor *ep_int;
 737         int res;
 738
 739         /*
 740          * Find the first endpoint of each type we need.
 741          * We are expecting a minimum of 2 endpoints - in and out (bulk).
 742          * An optional interrupt-in is OK (necessary for CBI protocol).
 743          * We will ignore any others.
 744          */
 745         res = usb_find_common_endpoints(alt, &ep_in, &ep_out, NULL, NULL);
 746         if (res) {
 747                 usb_stor_dbg(us, "bulk endpoints not found\n");
 748                 return res;
 749         }
 750
 751         res = usb_find_int_in_endpoint(alt, &ep_int);
 752         if (res && us->protocol == USB_PR_CBI) {
 753                 usb_stor_dbg(us, "interrupt endpoint not found\n");
 754                 return res;
 755         }
 756
 757         /* Calculate and store the pipe values */
 758         us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
 759         us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
 760         us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
 761                 usb_endpoint_num(ep_out));
 762         us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
 763                 usb_endpoint_num(ep_in));
 764         if (ep_int) {
 765                 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
 766                         usb_endpoint_num(ep_int));
 767                 us->ep_bInterval = ep_int->bInterval;
 768         }
 769         return 0;
 770 }
 771
 772 /* Initialize all the dynamic resources we need */
 773 static int usb_stor_acquire_resources(struct us_data *us)
 774 {
 775         int p;
 776         struct task_struct *th;
 777
 778         us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
 779         if (!us->current_urb)
 780                 return -ENOMEM;
 781
 782         /*
 783          * Just before we start our control thread, initialize
 784          * the device if it needs initialization
 785          */
 786         if (us->unusual_dev->initFunction) {
 787                 p = us->unusual_dev->initFunction(us);
 788                 if (p)
 789                         return p;
 790         }
 791
 792         /* Start up our control thread */
 793         th = kthread_run(usb_stor_control_thread, us, "usb-storage");
 794         if (IS_ERR(th)) {
 795                 dev_warn(&us->pusb_intf->dev,
 796                                 "Unable to start control thread\n");
 797                 return PTR_ERR(th);
 798         }
 799         us->ctl_thread = th;
 800
 801         return 0;
 802 }
 803
 804 /* Release all our dynamic resources */
 805 static void usb_stor_release_resources(struct us_data *us)
 806 {
 807         /*
 808          * Tell the control thread to exit.  The SCSI host must
 809          * already have been removed and the DISCONNECTING flag set
 810          * so that we won't accept any more commands.
 811          */
 812         usb_stor_dbg(us, "-- sending exit command to thread\n");
 813         complete(&us->cmnd_ready);
 814         if (us->ctl_thread)
 815                 kthread_stop(us->ctl_thread);
 816
 817         /* Call the destructor routine, if it exists */
 818         if (us->extra_destructor) {
 819                 usb_stor_dbg(us, "-- calling extra_destructor()\n");
 820                 us->extra_destructor(us->extra);
 821         }
 822
 823         /* Free the extra data and the URB */
 824         kfree(us->extra);
 825         usb_free_urb(us->current_urb);
 826 }
 827
 828 /* Dissociate from the USB device */
 829 static void dissociate_dev(struct us_data *us)
 830 {
 831         /* Free the buffers */
 832         kfree(us->cr);
 833         usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
 834
 835         /* Remove our private data from the interface */
 836         usb_set_intfdata(us->pusb_intf, NULL);
 837 }
 838
 839 /*
 840  * First stage of disconnect processing: stop SCSI scanning,
 841  * remove the host, and stop accepting new commands
 842  */
 843 static void quiesce_and_remove_host(struct us_data *us)
 844 {
 845         struct Scsi_Host *host = us_to_host(us);
 846
 847         /* If the device is really gone, cut short reset delays */
 848         if (us->pusb_dev->state == USB_STATE_NOTATTACHED) {
 849                 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 850                 wake_up(&us->delay_wait);
 851         }
 852
 853         /*
 854          * Prevent SCSI scanning (if it hasn't started yet)
 855          * or wait for the SCSI-scanning routine to stop.
 856          */
 857         cancel_delayed_work_sync(&us->scan_dwork);
 858
 859         /* Balance autopm calls if scanning was cancelled */
 860         if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags))
 861                 usb_autopm_put_interface_no_suspend(us->pusb_intf);
 862
 863         /*
 864          * Removing the host will perform an orderly shutdown: caches
 865          * synchronized, disks spun down, etc.
 866          */
 867         scsi_remove_host(host);
 868
 869         /*
 870          * Prevent any new commands from being accepted and cut short
 871          * reset delays.
 872          */
 873         scsi_lock(host);
 874         set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 875         scsi_unlock(host);
 876         wake_up(&us->delay_wait);
 877 }
 878
 879 /* Second stage of disconnect processing: deallocate all resources */
 880 static void release_everything(struct us_data *us)
 881 {
 882         usb_stor_release_resources(us);
 883         dissociate_dev(us);
 884
 885         /*
 886          * Drop our reference to the host; the SCSI core will free it
 887          * (and "us" along with it) when the refcount becomes 0.
 888          */
 889         scsi_host_put(us_to_host(us));
 890 }
 891
 892 /* Delayed-work routine to carry out SCSI-device scanning */
 893 static void usb_stor_scan_dwork(struct work_struct *work)
 894 {
 895         struct us_data *us = container_of(work, struct us_data,
 896                         scan_dwork.work);
 897         struct device *dev = &us->pusb_intf->dev;
 898
 899         dev_dbg(dev, "starting scan\n");
 900
 901         /* For bulk-only devices, determine the max LUN value */
 902         if (us->protocol == USB_PR_BULK &&
 903             !(us->fflags & US_FL_SINGLE_LUN) &&
 904             !(us->fflags & US_FL_SCM_MULT_TARG)) {
 905                 mutex_lock(&us->dev_mutex);
 906                 us->max_lun = usb_stor_Bulk_max_lun(us);
 907                 /*
 908                  * Allow proper scanning of devices that present more than 8 LUNs
 909                  * While not affecting other devices that may need the previous
 910                  * behavior
 911                  */
 912                 if (us->max_lun >= 8)
 913                         us_to_host(us)->max_lun = us->max_lun+1;
 914                 mutex_unlock(&us->dev_mutex);
 915         }
 916         scsi_scan_host(us_to_host(us));
 917         dev_dbg(dev, "scan complete\n");
 918
 919         /* Should we unbind if no devices were detected? */
 920
 921         usb_autopm_put_interface(us->pusb_intf);
 922         clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
 923 }
 924
 925 static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
 926 {
 927         struct usb_device *usb_dev = interface_to_usbdev(intf);
 928
 929         if (usb_dev->bus->sg_tablesize) {
 930                 return usb_dev->bus->sg_tablesize;
 931         }
 932         return SG_ALL;
 933 }
 934
 935 /* First part of general USB mass-storage probing */
 936 int usb_stor_probe1(struct us_data **pus,
 937                 struct usb_interface *intf,
 938                 const struct usb_device_id *id,
 939                 struct us_unusual_dev *unusual_dev,
 940                 struct scsi_host_template *sht)
 941 {
 942         struct Scsi_Host *host;
 943         struct us_data *us;
 944         int result;
 945
 946         dev_info(&intf->dev, "USB Mass Storage device detected\n");
 947
 948         /*
 949          * Ask the SCSI layer to allocate a host structure, with extra
 950          * space at the end for our private us_data structure.
 951          */
 952         host = scsi_host_alloc(sht, sizeof(*us));
 953         if (!host) {
 954                 dev_warn(&intf->dev, "Unable to allocate the scsi host\n");
 955                 return -ENOMEM;
 956         }
 957
 958         /*
 959          * Allow 16-byte CDBs and thus > 2TB
 960          */
 961         host->max_cmd_len = 16;
 962         host->sg_tablesize = usb_stor_sg_tablesize(intf);
 963         *pus = us = host_to_us(host);
 964         mutex_init(&(us->dev_mutex));
 965         us_set_lock_class(&us->dev_mutex, intf);
 966         init_completion(&us->cmnd_ready);
 967         init_completion(&(us->notify));
 968         init_waitqueue_head(&us->delay_wait);
 969         INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork);
 970
 971         /* Associate the us_data structure with the USB device */
 972         result = associate_dev(us, intf);
 973         if (result)
 974                 goto BadDevice;
 975
 976         /* Get the unusual_devs entries and the descriptors */
 977         result = get_device_info(us, id, unusual_dev);
 978         if (result)
 979                 goto BadDevice;
 980
 981         /* Get standard transport and protocol settings */
 982         get_transport(us);
 983         get_protocol(us);
 984
 985         /*
 986          * Give the caller a chance to fill in specialized transport
 987          * or protocol settings.
 988          */
 989         return 0;
 990
 991 BadDevice:
 992         usb_stor_dbg(us, "storage_probe() failed\n");
 993         release_everything(us);
 994         return result;
 995 }
 996 EXPORT_SYMBOL_GPL(usb_stor_probe1);
 997
 998 /* Second part of general USB mass-storage probing */
 999 int usb_stor_probe2(struct us_data *us)
1000 {
1001         int result;
1002         struct device *dev = &us->pusb_intf->dev;
1003
1004         /* Make sure the transport and protocol have both been set */
1005         if (!us->transport || !us->proto_handler) {
1006                 result = -ENXIO;
1007                 goto BadDevice;
1008         }
1009         usb_stor_dbg(us, "Transport: %s\n", us->transport_name);
1010         usb_stor_dbg(us, "Protocol: %s\n", us->protocol_name);
1011
1012         if (us->fflags & US_FL_SCM_MULT_TARG) {
1013                 /*
1014                  * SCM eUSCSI bridge devices can have different numbers
1015                  * of LUNs on different targets; allow all to be probed.
1016                  */
1017                 us->max_lun = 7;
1018                 /* The eUSCSI itself has ID 7, so avoid scanning that */
1019                 us_to_host(us)->this_id = 7;
1020                 /* max_id is 8 initially, so no need to set it here */
1021         } else {
1022                 /* In the normal case there is only a single target */
1023                 us_to_host(us)->max_id = 1;
1024                 /*
1025                  * Like Windows, we won't store the LUN bits in CDB[1] for
1026                  * SCSI-2 devices using the Bulk-Only transport (even though
1027                  * this violates the SCSI spec).
1028                  */
1029                 if (us->transport == usb_stor_Bulk_transport)
1030                         us_to_host(us)->no_scsi2_lun_in_cdb = 1;
1031         }
1032
1033         /* fix for single-lun devices */
1034         if (us->fflags & US_FL_SINGLE_LUN)
1035                 us->max_lun = 0;
1036
1037         /* Find the endpoints and calculate pipe values */
1038         result = get_pipes(us);
1039         if (result)
1040                 goto BadDevice;
1041
1042         /*
1043          * If the device returns invalid data for the first READ(10)
1044          * command, indicate the command should be retried.
1045          */
1046         if (us->fflags & US_FL_INITIAL_READ10)
1047                 set_bit(US_FLIDX_REDO_READ10, &us->dflags);
1048
1049         /* Acquire all the other resources and add the host */
1050         result = usb_stor_acquire_resources(us);
1051         if (result)
1052                 goto BadDevice;
1053         usb_autopm_get_interface_no_resume(us->pusb_intf);
1054         snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s",
1055                                         dev_name(&us->pusb_intf->dev));
1056         result = scsi_add_host(us_to_host(us), dev);
1057         if (result) {
1058                 dev_warn(dev,
1059                                 "Unable to add the scsi host\n");
1060                 goto HostAddErr;
1061         }
1062
1063         /* Submit the delayed_work for SCSI-device scanning */
1064         set_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
1065
1066         if (delay_use > 0)
1067                 dev_dbg(dev, "waiting for device to settle before scanning\n");
1068         queue_delayed_work(system_freezable_wq, &us->scan_dwork,
1069                         delay_use * HZ);
1070         return 0;
1071
1072         /* We come here if there are any problems */
1073 HostAddErr:
1074         usb_autopm_put_interface_no_suspend(us->pusb_intf);
1075 BadDevice:
1076         usb_stor_dbg(us, "storage_probe() failed\n");
1077         release_everything(us);
1078         return result;
1079 }
1080 EXPORT_SYMBOL_GPL(usb_stor_probe2);
1081
1082 /* Handle a USB mass-storage disconnect */
1083 void usb_stor_disconnect(struct usb_interface *intf)
1084 {
1085         struct us_data *us = usb_get_intfdata(intf);
1086
1087         quiesce_and_remove_host(us);
1088         release_everything(us);
1089 }
1090 EXPORT_SYMBOL_GPL(usb_stor_disconnect);
1091
1092 static struct scsi_host_template usb_stor_host_template;
1093
1094 /* The main probe routine for standard devices */
1095 static int storage_probe(struct usb_interface *intf,
1096                          const struct usb_device_id *id)
1097 {
1098         struct us_unusual_dev *unusual_dev;
1099         struct us_data *us;
1100         int result;
1101         int size;
1102
1103         /* If uas is enabled and this device can do uas then ignore it. */
1104 #if IS_ENABLED(CONFIG_USB_UAS)
1105         if (uas_use_uas_driver(intf, id, NULL))
1106                 return -ENXIO;
1107 #endif
1108
1109         /*
1110          * If the device isn't standard (is handled by a subdriver
1111          * module) then don't accept it.
1112          */
1113         if (usb_usual_ignore_device(intf))
1114                 return -ENXIO;
1115
1116         /*
1117          * Call the general probe procedures.
1118          *
1119          * The unusual_dev_list array is parallel to the usb_storage_usb_ids
1120          * table, so we use the index of the id entry to find the
1121          * corresponding unusual_devs entry.
1122          */
1123
1124         size = ARRAY_SIZE(us_unusual_dev_list);
1125         if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) {
1126                 unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list;
1127         } else {
1128                 unusual_dev = &for_dynamic_ids;
1129
1130                 dev_dbg(&intf->dev, "Use Bulk-Only transport with the Transparent SCSI protocol for dynamic id: 0x%04x 0x%04x\n",
1131                         id->idVendor, id->idProduct);
1132         }
1133
1134         result = usb_stor_probe1(&us, intf, id, unusual_dev,
1135                                  &usb_stor_host_template);
1136         if (result)
1137                 return result;
1138
1139         /* No special transport or protocol settings in the main module */
1140
1141         result = usb_stor_probe2(us);
1142         return result;
1143 }
1144
1145 static struct usb_driver usb_storage_driver = {
1146         .name =         DRV_NAME,
1147         .probe =        storage_probe,
1148         .disconnect =   usb_stor_disconnect,
1149         .suspend =      usb_stor_suspend,
1150         .resume =       usb_stor_resume,
1151         .reset_resume = usb_stor_reset_resume,
1152         .pre_reset =    usb_stor_pre_reset,
1153         .post_reset =   usb_stor_post_reset,
1154         .id_table =     usb_storage_usb_ids,
1155         .supports_autosuspend = 1,
1156         .soft_unbind =  1,
1157 };
1158
1159 module_usb_stor_driver(usb_storage_driver, usb_stor_host_template, DRV_NAME);