1 // SPDX-License-Identifier: GPL-2.0+
2 /*****************************************************************************/
5 * devio.c -- User space communication with USB devices.
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
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
22 /*****************************************************************************/
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>
48 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
49 #define USB_SG_SIZE 16384 /* split-size for large txs */
51 /* Mutual exclusion for removal, open, and release */
52 DEFINE_MUTEX(usbfs_mutex);
54 struct usb_dev_state {
55 struct list_head list; /* state list */
56 struct usb_device *dev;
58 spinlock_t lock; /* protects the async urb lists */
59 struct list_head async_pending;
60 struct list_head async_completed;
61 struct list_head memory_list;
62 wait_queue_head_t wait; /* wake up if a request completed */
63 unsigned int discsignr;
65 const struct cred *cred;
66 void __user *disccontext;
67 unsigned long ifclaimed;
68 u32 disabled_bulk_eps;
69 bool privileges_dropped;
70 unsigned long interface_allowed_mask;
74 struct list_head memlist;
79 dma_addr_t dma_handle;
80 unsigned long vm_start;
81 struct usb_dev_state *ps;
85 struct list_head asynclist;
86 struct usb_dev_state *ps;
88 const struct cred *cred;
91 void __user *userbuffer;
94 struct usb_memory *usbm;
95 unsigned int mem_usage;
101 static bool usbfs_snoop;
102 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
103 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
105 static unsigned usbfs_snoop_max = 65536;
106 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
107 MODULE_PARM_DESC(usbfs_snoop_max,
108 "maximum number of bytes to print while snooping");
110 #define snoop(dev, format, arg...) \
113 dev_info(dev, format, ## arg); \
120 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
122 /* Limit on the total amount of memory we can allocate for transfers */
123 static u32 usbfs_memory_mb = 16;
124 module_param(usbfs_memory_mb, uint, 0644);
125 MODULE_PARM_DESC(usbfs_memory_mb,
126 "maximum MB allowed for usbfs buffers (0 = no limit)");
128 /* Hard limit, necessary to avoid arithmetic overflow */
129 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
131 static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
133 /* Check whether it's okay to allocate more memory for a transfer */
134 static int usbfs_increase_memory_usage(u64 amount)
138 lim = READ_ONCE(usbfs_memory_mb);
141 atomic64_add(amount, &usbfs_memory_usage);
143 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
144 atomic64_sub(amount, &usbfs_memory_usage);
151 /* Memory for a transfer is being deallocated */
152 static void usbfs_decrease_memory_usage(u64 amount)
154 atomic64_sub(amount, &usbfs_memory_usage);
157 static int connected(struct usb_dev_state *ps)
159 return (!list_empty(&ps->list) &&
160 ps->dev->state != USB_STATE_NOTATTACHED);
163 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
165 struct usb_dev_state *ps = usbm->ps;
168 spin_lock_irqsave(&ps->lock, flags);
170 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
171 list_del(&usbm->memlist);
172 spin_unlock_irqrestore(&ps->lock, flags);
174 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
176 usbfs_decrease_memory_usage(
177 usbm->size + sizeof(struct usb_memory));
180 spin_unlock_irqrestore(&ps->lock, flags);
184 static void usbdev_vm_open(struct vm_area_struct *vma)
186 struct usb_memory *usbm = vma->vm_private_data;
189 spin_lock_irqsave(&usbm->ps->lock, flags);
190 ++usbm->vma_use_count;
191 spin_unlock_irqrestore(&usbm->ps->lock, flags);
194 static void usbdev_vm_close(struct vm_area_struct *vma)
196 struct usb_memory *usbm = vma->vm_private_data;
198 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
201 static const struct vm_operations_struct usbdev_vm_ops = {
202 .open = usbdev_vm_open,
203 .close = usbdev_vm_close
206 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
208 struct usb_memory *usbm = NULL;
209 struct usb_dev_state *ps = file->private_data;
210 size_t size = vma->vm_end - vma->vm_start;
213 dma_addr_t dma_handle;
216 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
220 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
223 goto error_decrease_mem;
226 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
230 goto error_free_usbm;
233 memset(mem, 0, size);
236 usbm->dma_handle = dma_handle;
239 usbm->vm_start = vma->vm_start;
240 usbm->vma_use_count = 1;
241 INIT_LIST_HEAD(&usbm->memlist);
243 if (remap_pfn_range(vma, vma->vm_start,
244 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
245 size, vma->vm_page_prot) < 0) {
246 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
250 vma->vm_flags |= VM_IO;
251 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
252 vma->vm_ops = &usbdev_vm_ops;
253 vma->vm_private_data = usbm;
255 spin_lock_irqsave(&ps->lock, flags);
256 list_add_tail(&usbm->memlist, &ps->memory_list);
257 spin_unlock_irqrestore(&ps->lock, flags);
264 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
269 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
272 struct usb_dev_state *ps = file->private_data;
273 struct usb_device *dev = ps->dev;
280 usb_lock_device(dev);
281 if (!connected(ps)) {
284 } else if (pos < 0) {
289 if (pos < sizeof(struct usb_device_descriptor)) {
290 /* 18 bytes - fits on the stack */
291 struct usb_device_descriptor temp_desc;
293 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
294 le16_to_cpus(&temp_desc.bcdUSB);
295 le16_to_cpus(&temp_desc.idVendor);
296 le16_to_cpus(&temp_desc.idProduct);
297 le16_to_cpus(&temp_desc.bcdDevice);
299 len = sizeof(struct usb_device_descriptor) - pos;
302 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
313 pos = sizeof(struct usb_device_descriptor);
314 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
315 struct usb_config_descriptor *config =
316 (struct usb_config_descriptor *)dev->rawdescriptors[i];
317 unsigned int length = le16_to_cpu(config->wTotalLength);
319 if (*ppos < pos + length) {
321 /* The descriptor may claim to be longer than it
322 * really is. Here is the actual allocated length. */
324 le16_to_cpu(dev->config[i].desc.wTotalLength);
326 len = length - (*ppos - pos);
330 /* Simply don't write (skip over) unallocated parts */
331 if (alloclen > (*ppos - pos)) {
332 alloclen -= (*ppos - pos);
333 if (copy_to_user(buf,
334 dev->rawdescriptors[i] + (*ppos - pos),
335 min(len, alloclen))) {
351 usb_unlock_device(dev);
356 * async list handling
359 static struct async *alloc_async(unsigned int numisoframes)
363 as = kzalloc(sizeof(struct async), GFP_KERNEL);
366 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
374 static void free_async(struct async *as)
381 for (i = 0; i < as->urb->num_sgs; i++) {
382 if (sg_page(&as->urb->sg[i]))
383 kfree(sg_virt(&as->urb->sg[i]));
387 if (as->usbm == NULL)
388 kfree(as->urb->transfer_buffer);
390 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
392 kfree(as->urb->setup_packet);
393 usb_free_urb(as->urb);
394 usbfs_decrease_memory_usage(as->mem_usage);
398 static void async_newpending(struct async *as)
400 struct usb_dev_state *ps = as->ps;
403 spin_lock_irqsave(&ps->lock, flags);
404 list_add_tail(&as->asynclist, &ps->async_pending);
405 spin_unlock_irqrestore(&ps->lock, flags);
408 static void async_removepending(struct async *as)
410 struct usb_dev_state *ps = as->ps;
413 spin_lock_irqsave(&ps->lock, flags);
414 list_del_init(&as->asynclist);
415 spin_unlock_irqrestore(&ps->lock, flags);
418 static struct async *async_getcompleted(struct usb_dev_state *ps)
421 struct async *as = NULL;
423 spin_lock_irqsave(&ps->lock, flags);
424 if (!list_empty(&ps->async_completed)) {
425 as = list_entry(ps->async_completed.next, struct async,
427 list_del_init(&as->asynclist);
429 spin_unlock_irqrestore(&ps->lock, flags);
433 static struct async *async_getpending(struct usb_dev_state *ps,
434 void __user *userurb)
438 list_for_each_entry(as, &ps->async_pending, asynclist)
439 if (as->userurb == userurb) {
440 list_del_init(&as->asynclist);
447 static void snoop_urb(struct usb_device *udev,
448 void __user *userurb, int pipe, unsigned length,
449 int timeout_or_status, enum snoop_when when,
450 unsigned char *data, unsigned data_len)
452 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
453 static const char *dirs[] = {"out", "in"};
460 ep = usb_pipeendpoint(pipe);
461 t = types[usb_pipetype(pipe)];
462 d = dirs[!!usb_pipein(pipe)];
464 if (userurb) { /* Async */
466 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
468 userurb, ep, t, d, length);
470 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
471 "actual_length %u status %d\n",
472 userurb, ep, t, d, length,
476 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
478 ep, t, d, length, timeout_or_status);
480 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
482 ep, t, d, length, timeout_or_status);
485 data_len = min(data_len, usbfs_snoop_max);
486 if (data && data_len > 0) {
487 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
492 static void snoop_urb_data(struct urb *urb, unsigned len)
496 len = min(len, usbfs_snoop_max);
497 if (!usbfs_snoop || len == 0)
500 if (urb->num_sgs == 0) {
501 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
502 urb->transfer_buffer, len, 1);
506 for (i = 0; i < urb->num_sgs && len; i++) {
507 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
508 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
509 sg_virt(&urb->sg[i]), size, 1);
514 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
516 unsigned i, len, size;
518 if (urb->number_of_packets > 0) /* Isochronous */
519 len = urb->transfer_buffer_length;
521 len = urb->actual_length;
523 if (urb->num_sgs == 0) {
524 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
529 for (i = 0; i < urb->num_sgs && len; i++) {
530 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
531 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
540 #define AS_CONTINUATION 1
543 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
550 /* Mark all the pending URBs that match bulk_addr, up to but not
551 * including the first one without AS_CONTINUATION. If such an
552 * URB is encountered then a new transfer has already started so
553 * the endpoint doesn't need to be disabled; otherwise it does.
555 list_for_each_entry(as, &ps->async_pending, asynclist) {
556 if (as->bulk_addr == bulk_addr) {
557 if (as->bulk_status != AS_CONTINUATION)
559 as->bulk_status = AS_UNLINK;
563 ps->disabled_bulk_eps |= (1 << bulk_addr);
565 /* Now carefully unlink all the marked pending URBs */
567 list_for_each_entry(as, &ps->async_pending, asynclist) {
568 if (as->bulk_status == AS_UNLINK) {
569 as->bulk_status = 0; /* Only once */
572 spin_unlock(&ps->lock); /* Allow completions */
575 spin_lock(&ps->lock);
581 static void async_completed(struct urb *urb)
583 struct async *as = urb->context;
584 struct usb_dev_state *ps = as->ps;
585 struct siginfo sinfo;
586 struct pid *pid = NULL;
587 const struct cred *cred = NULL;
591 spin_lock_irqsave(&ps->lock, flags);
592 list_move_tail(&as->asynclist, &ps->async_completed);
593 as->status = urb->status;
596 clear_siginfo(&sinfo);
597 sinfo.si_signo = as->signr;
598 sinfo.si_errno = as->status;
599 sinfo.si_code = SI_ASYNCIO;
600 sinfo.si_addr = as->userurb;
601 pid = get_pid(as->pid);
602 cred = get_cred(as->cred);
604 snoop(&urb->dev->dev, "urb complete\n");
605 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
606 as->status, COMPLETE, NULL, 0);
607 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
608 snoop_urb_data(urb, urb->actual_length);
610 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
611 as->status != -ENOENT)
612 cancel_bulk_urbs(ps, as->bulk_addr);
615 spin_unlock_irqrestore(&ps->lock, flags);
618 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
624 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
630 spin_lock_irqsave(&ps->lock, flags);
631 while (!list_empty(list)) {
632 as = list_entry(list->next, struct async, asynclist);
633 list_del_init(&as->asynclist);
637 /* drop the spinlock so the completion handler can run */
638 spin_unlock_irqrestore(&ps->lock, flags);
641 spin_lock_irqsave(&ps->lock, flags);
643 spin_unlock_irqrestore(&ps->lock, flags);
646 static void destroy_async_on_interface(struct usb_dev_state *ps,
649 struct list_head *p, *q, hitlist;
652 INIT_LIST_HEAD(&hitlist);
653 spin_lock_irqsave(&ps->lock, flags);
654 list_for_each_safe(p, q, &ps->async_pending)
655 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
656 list_move_tail(p, &hitlist);
657 spin_unlock_irqrestore(&ps->lock, flags);
658 destroy_async(ps, &hitlist);
661 static void destroy_all_async(struct usb_dev_state *ps)
663 destroy_async(ps, &ps->async_pending);
667 * interface claims are made only at the request of user level code,
668 * which can also release them (explicitly or by closing files).
669 * they're also undone when devices disconnect.
672 static int driver_probe(struct usb_interface *intf,
673 const struct usb_device_id *id)
678 static void driver_disconnect(struct usb_interface *intf)
680 struct usb_dev_state *ps = usb_get_intfdata(intf);
681 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
686 /* NOTE: this relies on usbcore having canceled and completed
687 * all pending I/O requests; 2.6 does that.
690 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
691 clear_bit(ifnum, &ps->ifclaimed);
693 dev_warn(&intf->dev, "interface number %u out of range\n",
696 usb_set_intfdata(intf, NULL);
698 /* force async requests to complete */
699 destroy_async_on_interface(ps, ifnum);
702 /* The following routines are merely placeholders. There is no way
703 * to inform a user task about suspend or resumes.
705 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
710 static int driver_resume(struct usb_interface *intf)
715 struct usb_driver usbfs_driver = {
717 .probe = driver_probe,
718 .disconnect = driver_disconnect,
719 .suspend = driver_suspend,
720 .resume = driver_resume,
723 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
725 struct usb_device *dev = ps->dev;
726 struct usb_interface *intf;
729 if (ifnum >= 8*sizeof(ps->ifclaimed))
731 /* already claimed */
732 if (test_bit(ifnum, &ps->ifclaimed))
735 if (ps->privileges_dropped &&
736 !test_bit(ifnum, &ps->interface_allowed_mask))
739 intf = usb_ifnum_to_if(dev, ifnum);
743 unsigned int old_suppress;
745 /* suppress uevents while claiming interface */
746 old_suppress = dev_get_uevent_suppress(&intf->dev);
747 dev_set_uevent_suppress(&intf->dev, 1);
748 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
749 dev_set_uevent_suppress(&intf->dev, old_suppress);
752 set_bit(ifnum, &ps->ifclaimed);
756 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
758 struct usb_device *dev;
759 struct usb_interface *intf;
763 if (ifnum >= 8*sizeof(ps->ifclaimed))
766 intf = usb_ifnum_to_if(dev, ifnum);
769 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
770 unsigned int old_suppress;
772 /* suppress uevents while releasing interface */
773 old_suppress = dev_get_uevent_suppress(&intf->dev);
774 dev_set_uevent_suppress(&intf->dev, 1);
775 usb_driver_release_interface(&usbfs_driver, intf);
776 dev_set_uevent_suppress(&intf->dev, old_suppress);
782 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
784 if (ps->dev->state != USB_STATE_CONFIGURED)
785 return -EHOSTUNREACH;
786 if (ifnum >= 8*sizeof(ps->ifclaimed))
788 if (test_bit(ifnum, &ps->ifclaimed))
790 /* if not yet claimed, claim it for the driver */
791 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
792 "interface %u before use\n", task_pid_nr(current),
793 current->comm, ifnum);
794 return claimintf(ps, ifnum);
797 static int findintfep(struct usb_device *dev, unsigned int ep)
799 unsigned int i, j, e;
800 struct usb_interface *intf;
801 struct usb_host_interface *alts;
802 struct usb_endpoint_descriptor *endpt;
804 if (ep & ~(USB_DIR_IN|0xf))
808 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
809 intf = dev->actconfig->interface[i];
810 for (j = 0; j < intf->num_altsetting; j++) {
811 alts = &intf->altsetting[j];
812 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
813 endpt = &alts->endpoint[e].desc;
814 if (endpt->bEndpointAddress == ep)
815 return alts->desc.bInterfaceNumber;
822 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
823 unsigned int request, unsigned int index)
826 struct usb_host_interface *alt_setting;
828 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
829 && ps->dev->state != USB_STATE_ADDRESS
830 && ps->dev->state != USB_STATE_CONFIGURED)
831 return -EHOSTUNREACH;
832 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
836 * check for the special corner case 'get_device_id' in the printer
837 * class specification, which we always want to allow as it is used
838 * to query things like ink level, etc.
840 if (requesttype == 0xa1 && request == 0) {
841 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
842 index >> 8, index & 0xff);
844 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
849 switch (requesttype & USB_RECIP_MASK) {
850 case USB_RECIP_ENDPOINT:
851 if ((index & ~USB_DIR_IN) == 0)
853 ret = findintfep(ps->dev, index);
856 * Some not fully compliant Win apps seem to get
857 * index wrong and have the endpoint number here
858 * rather than the endpoint address (with the
859 * correct direction). Win does let this through,
860 * so we'll not reject it here but leave it to
861 * the device to not break KVM. But we warn.
863 ret = findintfep(ps->dev, index ^ 0x80);
865 dev_info(&ps->dev->dev,
866 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
867 __func__, task_pid_nr(current),
868 current->comm, index, index ^ 0x80);
871 ret = checkintf(ps, ret);
874 case USB_RECIP_INTERFACE:
875 ret = checkintf(ps, index);
881 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
884 if (ep & USB_ENDPOINT_DIR_MASK)
885 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
887 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
890 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
891 struct usbdevfs_streams __user *streams,
892 unsigned int *num_streams_ret,
893 unsigned int *num_eps_ret,
894 struct usb_host_endpoint ***eps_ret,
895 struct usb_interface **intf_ret)
897 unsigned int i, num_streams, num_eps;
898 struct usb_host_endpoint **eps;
899 struct usb_interface *intf = NULL;
903 if (get_user(num_streams, &streams->num_streams) ||
904 get_user(num_eps, &streams->num_eps))
907 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
910 /* The XHCI controller allows max 2 ^ 16 streams */
911 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
914 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
918 for (i = 0; i < num_eps; i++) {
919 if (get_user(ep, &streams->eps[i])) {
923 eps[i] = ep_to_host_endpoint(ps->dev, ep);
929 /* usb_alloc/free_streams operate on an usb_interface */
930 ifnum = findintfep(ps->dev, ep);
937 ret = checkintf(ps, ifnum);
940 intf = usb_ifnum_to_if(ps->dev, ifnum);
942 /* Verify all eps belong to the same interface */
943 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
951 *num_streams_ret = num_streams;
952 *num_eps_ret = num_eps;
963 static int match_devt(struct device *dev, void *data)
965 return dev->devt == (dev_t) (unsigned long) data;
968 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
972 dev = bus_find_device(&usb_bus_type, NULL,
973 (void *) (unsigned long) devt, match_devt);
976 return to_usb_device(dev);
982 static int usbdev_open(struct inode *inode, struct file *file)
984 struct usb_device *dev = NULL;
985 struct usb_dev_state *ps;
989 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
995 /* Protect against simultaneous removal or release */
996 mutex_lock(&usbfs_mutex);
998 /* usbdev device-node */
999 if (imajor(inode) == USB_DEVICE_MAJOR)
1000 dev = usbdev_lookup_by_devt(inode->i_rdev);
1002 mutex_unlock(&usbfs_mutex);
1007 usb_lock_device(dev);
1008 if (dev->state == USB_STATE_NOTATTACHED)
1009 goto out_unlock_device;
1011 ret = usb_autoresume_device(dev);
1013 goto out_unlock_device;
1017 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1018 spin_lock_init(&ps->lock);
1019 INIT_LIST_HEAD(&ps->list);
1020 INIT_LIST_HEAD(&ps->async_pending);
1021 INIT_LIST_HEAD(&ps->async_completed);
1022 INIT_LIST_HEAD(&ps->memory_list);
1023 init_waitqueue_head(&ps->wait);
1024 ps->disc_pid = get_pid(task_pid(current));
1025 ps->cred = get_current_cred();
1027 list_add_tail(&ps->list, &dev->filelist);
1028 file->private_data = ps;
1029 usb_unlock_device(dev);
1030 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1035 usb_unlock_device(dev);
1042 static int usbdev_release(struct inode *inode, struct file *file)
1044 struct usb_dev_state *ps = file->private_data;
1045 struct usb_device *dev = ps->dev;
1049 usb_lock_device(dev);
1050 usb_hub_release_all_ports(dev, ps);
1052 list_del_init(&ps->list);
1054 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1056 if (test_bit(ifnum, &ps->ifclaimed))
1057 releaseintf(ps, ifnum);
1059 destroy_all_async(ps);
1060 usb_autosuspend_device(dev);
1061 usb_unlock_device(dev);
1063 put_pid(ps->disc_pid);
1066 as = async_getcompleted(ps);
1069 as = async_getcompleted(ps);
1076 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1078 struct usb_device *dev = ps->dev;
1079 struct usbdevfs_ctrltransfer ctrl;
1081 unsigned char *tbuf;
1085 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1087 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1091 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1092 if (wLength > PAGE_SIZE)
1094 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1095 sizeof(struct usb_ctrlrequest));
1098 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1104 snoop(&dev->dev, "control urb: bRequestType=%02x "
1105 "bRequest=%02x wValue=%04x "
1106 "wIndex=%04x wLength=%04x\n",
1107 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1108 ctrl.wIndex, ctrl.wLength);
1109 if (ctrl.bRequestType & 0x80) {
1110 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1115 pipe = usb_rcvctrlpipe(dev, 0);
1116 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1118 usb_unlock_device(dev);
1119 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1120 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1121 tbuf, ctrl.wLength, tmo);
1122 usb_lock_device(dev);
1123 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1125 if ((i > 0) && ctrl.wLength) {
1126 if (copy_to_user(ctrl.data, tbuf, i)) {
1133 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1138 pipe = usb_sndctrlpipe(dev, 0);
1139 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1140 tbuf, ctrl.wLength);
1142 usb_unlock_device(dev);
1143 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1144 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1145 tbuf, ctrl.wLength, tmo);
1146 usb_lock_device(dev);
1147 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1149 if (i < 0 && i != -EPIPE) {
1150 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1151 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1152 current->comm, ctrl.bRequestType, ctrl.bRequest,
1157 free_page((unsigned long) tbuf);
1158 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1159 sizeof(struct usb_ctrlrequest));
1163 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1165 struct usb_device *dev = ps->dev;
1166 struct usbdevfs_bulktransfer bulk;
1167 unsigned int tmo, len1, pipe;
1169 unsigned char *tbuf;
1172 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1174 ret = findintfep(ps->dev, bulk.ep);
1177 ret = checkintf(ps, ret);
1180 if (bulk.ep & USB_DIR_IN)
1181 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1183 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1184 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1187 if (len1 >= (INT_MAX - sizeof(struct urb)))
1189 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1194 * len1 can be almost arbitrarily large. Don't WARN if it's
1195 * too big, just fail the request.
1197 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1203 if (bulk.ep & 0x80) {
1204 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1208 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1210 usb_unlock_device(dev);
1211 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1212 usb_lock_device(dev);
1213 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1216 if (copy_to_user(bulk.data, tbuf, len2)) {
1223 if (copy_from_user(tbuf, bulk.data, len1)) {
1228 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1230 usb_unlock_device(dev);
1231 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1232 usb_lock_device(dev);
1233 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1235 ret = (i < 0 ? i : len2);
1238 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1242 static void check_reset_of_active_ep(struct usb_device *udev,
1243 unsigned int epnum, char *ioctl_name)
1245 struct usb_host_endpoint **eps;
1246 struct usb_host_endpoint *ep;
1248 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1249 ep = eps[epnum & 0x0f];
1250 if (ep && !list_empty(&ep->urb_list))
1251 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1252 task_pid_nr(current), current->comm,
1256 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1261 if (get_user(ep, (unsigned int __user *)arg))
1263 ret = findintfep(ps->dev, ep);
1266 ret = checkintf(ps, ret);
1269 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1270 usb_reset_endpoint(ps->dev, ep);
1274 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1280 if (get_user(ep, (unsigned int __user *)arg))
1282 ret = findintfep(ps->dev, ep);
1285 ret = checkintf(ps, ret);
1288 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1289 if (ep & USB_DIR_IN)
1290 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1292 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1294 return usb_clear_halt(ps->dev, pipe);
1297 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1299 struct usbdevfs_getdriver gd;
1300 struct usb_interface *intf;
1303 if (copy_from_user(&gd, arg, sizeof(gd)))
1305 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1306 if (!intf || !intf->dev.driver)
1309 strlcpy(gd.driver, intf->dev.driver->name,
1311 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1316 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1318 struct usbdevfs_connectinfo ci;
1320 memset(&ci, 0, sizeof(ci));
1321 ci.devnum = ps->dev->devnum;
1322 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1324 if (copy_to_user(arg, &ci, sizeof(ci)))
1329 static int proc_resetdevice(struct usb_dev_state *ps)
1331 struct usb_host_config *actconfig = ps->dev->actconfig;
1332 struct usb_interface *interface;
1335 /* Don't allow a device reset if the process has dropped the
1336 * privilege to do such things and any of the interfaces are
1337 * currently claimed.
1339 if (ps->privileges_dropped && actconfig) {
1340 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1341 interface = actconfig->interface[i];
1342 number = interface->cur_altsetting->desc.bInterfaceNumber;
1343 if (usb_interface_claimed(interface) &&
1344 !test_bit(number, &ps->ifclaimed)) {
1345 dev_warn(&ps->dev->dev,
1346 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1347 number, interface->dev.driver->name, current->comm);
1353 return usb_reset_device(ps->dev);
1356 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1358 struct usbdevfs_setinterface setintf;
1361 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1363 ret = checkintf(ps, setintf.interface);
1367 destroy_async_on_interface(ps, setintf.interface);
1369 return usb_set_interface(ps->dev, setintf.interface,
1370 setintf.altsetting);
1373 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1377 struct usb_host_config *actconfig;
1379 if (get_user(u, (int __user *)arg))
1382 actconfig = ps->dev->actconfig;
1384 /* Don't touch the device if any interfaces are claimed.
1385 * It could interfere with other drivers' operations, and if
1386 * an interface is claimed by usbfs it could easily deadlock.
1391 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1392 if (usb_interface_claimed(actconfig->interface[i])) {
1393 dev_warn(&ps->dev->dev,
1394 "usbfs: interface %d claimed by %s "
1395 "while '%s' sets config #%d\n",
1396 actconfig->interface[i]
1398 ->desc.bInterfaceNumber,
1399 actconfig->interface[i]
1408 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1409 * so avoid usb_set_configuration()'s kick to sysfs
1412 if (actconfig && actconfig->desc.bConfigurationValue == u)
1413 status = usb_reset_configuration(ps->dev);
1415 status = usb_set_configuration(ps->dev, u);
1421 static struct usb_memory *
1422 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1424 struct usb_memory *usbm = NULL, *iter;
1425 unsigned long flags;
1426 unsigned long uurb_start = (unsigned long)uurb->buffer;
1428 spin_lock_irqsave(&ps->lock, flags);
1429 list_for_each_entry(iter, &ps->memory_list, memlist) {
1430 if (uurb_start >= iter->vm_start &&
1431 uurb_start < iter->vm_start + iter->size) {
1432 if (uurb->buffer_length > iter->vm_start + iter->size -
1434 usbm = ERR_PTR(-EINVAL);
1437 usbm->urb_use_count++;
1442 spin_unlock_irqrestore(&ps->lock, flags);
1446 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1447 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1450 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1451 struct usb_host_endpoint *ep;
1452 struct async *as = NULL;
1453 struct usb_ctrlrequest *dr = NULL;
1454 unsigned int u, totlen, isofrmlen;
1455 int i, ret, num_sgs = 0, ifnum = -1;
1456 int number_of_packets = 0;
1457 unsigned int stream_id = 0;
1460 bool allow_short = false;
1461 bool allow_zero = false;
1462 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1463 USBDEVFS_URB_BULK_CONTINUATION |
1464 USBDEVFS_URB_NO_FSBR |
1465 USBDEVFS_URB_ZERO_PACKET |
1466 USBDEVFS_URB_NO_INTERRUPT;
1467 /* USBDEVFS_URB_ISO_ASAP is a special case */
1468 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1469 mask |= USBDEVFS_URB_ISO_ASAP;
1471 if (uurb->flags & ~mask)
1474 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1476 if (uurb->buffer_length > 0 && !uurb->buffer)
1478 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1479 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1480 ifnum = findintfep(ps->dev, uurb->endpoint);
1483 ret = checkintf(ps, ifnum);
1487 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1490 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1493 switch (uurb->type) {
1494 case USBDEVFS_URB_TYPE_CONTROL:
1495 if (!usb_endpoint_xfer_control(&ep->desc))
1497 /* min 8 byte setup packet */
1498 if (uurb->buffer_length < 8)
1500 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1503 if (copy_from_user(dr, uurb->buffer, 8)) {
1507 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1511 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1512 le16_to_cpup(&dr->wIndex));
1515 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1517 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1519 uurb->endpoint |= USB_DIR_IN;
1522 uurb->endpoint &= ~USB_DIR_IN;
1526 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1527 "bRequest=%02x wValue=%04x "
1528 "wIndex=%04x wLength=%04x\n",
1529 dr->bRequestType, dr->bRequest,
1530 __le16_to_cpup(&dr->wValue),
1531 __le16_to_cpup(&dr->wIndex),
1532 __le16_to_cpup(&dr->wLength));
1533 u = sizeof(struct usb_ctrlrequest);
1536 case USBDEVFS_URB_TYPE_BULK:
1541 switch (usb_endpoint_type(&ep->desc)) {
1542 case USB_ENDPOINT_XFER_CONTROL:
1543 case USB_ENDPOINT_XFER_ISOC:
1545 case USB_ENDPOINT_XFER_INT:
1546 /* allow single-shot interrupt transfers */
1547 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1550 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1551 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1554 stream_id = uurb->stream_id;
1557 case USBDEVFS_URB_TYPE_INTERRUPT:
1558 if (!usb_endpoint_xfer_int(&ep->desc))
1567 case USBDEVFS_URB_TYPE_ISO:
1568 /* arbitrary limit */
1569 if (uurb->number_of_packets < 1 ||
1570 uurb->number_of_packets > 128)
1572 if (!usb_endpoint_xfer_isoc(&ep->desc))
1574 number_of_packets = uurb->number_of_packets;
1575 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1577 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1578 if (IS_ERR(isopkt)) {
1579 ret = PTR_ERR(isopkt);
1583 for (totlen = u = 0; u < number_of_packets; u++) {
1585 * arbitrary limit need for USB 3.0
1586 * bMaxBurst (0~15 allowed, 1~16 packets)
1587 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1588 * sizemax: 1024 * 16 * 3 = 49152
1590 if (isopkt[u].length > 49152) {
1594 totlen += isopkt[u].length;
1596 u *= sizeof(struct usb_iso_packet_descriptor);
1597 uurb->buffer_length = totlen;
1604 if (uurb->buffer_length > 0 &&
1605 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1606 uurb->buffer, uurb->buffer_length)) {
1610 as = alloc_async(number_of_packets);
1616 as->usbm = find_memory_area(ps, uurb);
1617 if (IS_ERR(as->usbm)) {
1618 ret = PTR_ERR(as->usbm);
1623 /* do not use SG buffers when memory mapped segments
1629 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1630 num_sgs * sizeof(struct scatterlist);
1631 ret = usbfs_increase_memory_usage(u);
1637 as->urb->sg = kmalloc_array(num_sgs,
1638 sizeof(struct scatterlist),
1639 GFP_KERNEL | __GFP_NOWARN);
1644 as->urb->num_sgs = num_sgs;
1645 sg_init_table(as->urb->sg, as->urb->num_sgs);
1647 totlen = uurb->buffer_length;
1648 for (i = 0; i < as->urb->num_sgs; i++) {
1649 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1650 buf = kmalloc(u, GFP_KERNEL);
1655 sg_set_buf(&as->urb->sg[i], buf, u);
1658 if (copy_from_user(buf, uurb->buffer, u)) {
1666 } else if (uurb->buffer_length > 0) {
1668 unsigned long uurb_start = (unsigned long)uurb->buffer;
1670 as->urb->transfer_buffer = as->usbm->mem +
1671 (uurb_start - as->usbm->vm_start);
1673 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1674 GFP_KERNEL | __GFP_NOWARN);
1675 if (!as->urb->transfer_buffer) {
1680 if (copy_from_user(as->urb->transfer_buffer,
1682 uurb->buffer_length)) {
1686 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1688 * Isochronous input data may end up being
1689 * discontiguous if some of the packets are
1690 * short. Clear the buffer so that the gaps
1691 * don't leak kernel data to userspace.
1693 memset(as->urb->transfer_buffer, 0,
1694 uurb->buffer_length);
1698 as->urb->dev = ps->dev;
1699 as->urb->pipe = (uurb->type << 30) |
1700 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1701 (uurb->endpoint & USB_DIR_IN);
1703 /* This tedious sequence is necessary because the URB_* flags
1704 * are internal to the kernel and subject to change, whereas
1705 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1707 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1708 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1710 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1711 u |= URB_SHORT_NOT_OK;
1712 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1713 u |= URB_ZERO_PACKET;
1714 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1715 u |= URB_NO_INTERRUPT;
1716 as->urb->transfer_flags = u;
1718 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1719 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1720 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1721 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1723 as->urb->transfer_buffer_length = uurb->buffer_length;
1724 as->urb->setup_packet = (unsigned char *)dr;
1726 as->urb->start_frame = uurb->start_frame;
1727 as->urb->number_of_packets = number_of_packets;
1728 as->urb->stream_id = stream_id;
1730 if (ep->desc.bInterval) {
1731 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1732 ps->dev->speed == USB_SPEED_HIGH ||
1733 ps->dev->speed >= USB_SPEED_SUPER)
1734 as->urb->interval = 1 <<
1735 min(15, ep->desc.bInterval - 1);
1737 as->urb->interval = ep->desc.bInterval;
1740 as->urb->context = as;
1741 as->urb->complete = async_completed;
1742 for (totlen = u = 0; u < number_of_packets; u++) {
1743 as->urb->iso_frame_desc[u].offset = totlen;
1744 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1745 totlen += isopkt[u].length;
1752 unsigned long uurb_start = (unsigned long)uurb->buffer;
1754 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1755 as->urb->transfer_dma = as->usbm->dma_handle +
1756 (uurb_start - as->usbm->vm_start);
1757 } else if (is_in && uurb->buffer_length > 0)
1758 as->userbuffer = uurb->buffer;
1759 as->signr = uurb->signr;
1761 as->pid = get_pid(task_pid(current));
1762 as->cred = get_current_cred();
1763 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1764 as->urb->transfer_buffer_length, 0, SUBMIT,
1767 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1769 async_newpending(as);
1771 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1772 spin_lock_irq(&ps->lock);
1774 /* Not exactly the endpoint address; the direction bit is
1775 * shifted to the 0x10 position so that the value will be
1778 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1779 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1782 /* If this bulk URB is the start of a new transfer, re-enable
1783 * the endpoint. Otherwise mark it as a continuation URB.
1785 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1786 as->bulk_status = AS_CONTINUATION;
1788 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1790 /* Don't accept continuation URBs if the endpoint is
1791 * disabled because of an earlier error.
1793 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1796 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1797 spin_unlock_irq(&ps->lock);
1799 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1803 dev_printk(KERN_DEBUG, &ps->dev->dev,
1804 "usbfs: usb_submit_urb returned %d\n", ret);
1805 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1806 0, ret, COMPLETE, NULL, 0);
1807 async_removepending(as);
1820 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1822 struct usbdevfs_urb uurb;
1824 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1827 return proc_do_submiturb(ps, &uurb,
1828 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1832 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1836 unsigned long flags;
1838 spin_lock_irqsave(&ps->lock, flags);
1839 as = async_getpending(ps, arg);
1841 spin_unlock_irqrestore(&ps->lock, flags);
1847 spin_unlock_irqrestore(&ps->lock, flags);
1855 static void compute_isochronous_actual_length(struct urb *urb)
1859 if (urb->number_of_packets > 0) {
1860 urb->actual_length = 0;
1861 for (i = 0; i < urb->number_of_packets; i++)
1862 urb->actual_length +=
1863 urb->iso_frame_desc[i].actual_length;
1867 static int processcompl(struct async *as, void __user * __user *arg)
1869 struct urb *urb = as->urb;
1870 struct usbdevfs_urb __user *userurb = as->userurb;
1871 void __user *addr = as->userurb;
1874 compute_isochronous_actual_length(urb);
1875 if (as->userbuffer && urb->actual_length) {
1876 if (copy_urb_data_to_user(as->userbuffer, urb))
1879 if (put_user(as->status, &userurb->status))
1881 if (put_user(urb->actual_length, &userurb->actual_length))
1883 if (put_user(urb->error_count, &userurb->error_count))
1886 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1887 for (i = 0; i < urb->number_of_packets; i++) {
1888 if (put_user(urb->iso_frame_desc[i].actual_length,
1889 &userurb->iso_frame_desc[i].actual_length))
1891 if (put_user(urb->iso_frame_desc[i].status,
1892 &userurb->iso_frame_desc[i].status))
1897 if (put_user(addr, (void __user * __user *)arg))
1905 static struct async *reap_as(struct usb_dev_state *ps)
1907 DECLARE_WAITQUEUE(wait, current);
1908 struct async *as = NULL;
1909 struct usb_device *dev = ps->dev;
1911 add_wait_queue(&ps->wait, &wait);
1913 __set_current_state(TASK_INTERRUPTIBLE);
1914 as = async_getcompleted(ps);
1915 if (as || !connected(ps))
1917 if (signal_pending(current))
1919 usb_unlock_device(dev);
1921 usb_lock_device(dev);
1923 remove_wait_queue(&ps->wait, &wait);
1924 set_current_state(TASK_RUNNING);
1928 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1930 struct async *as = reap_as(ps);
1935 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
1936 retval = processcompl(as, (void __user * __user *)arg);
1940 if (signal_pending(current))
1945 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1950 as = async_getcompleted(ps);
1952 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
1953 retval = processcompl(as, (void __user * __user *)arg);
1956 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1961 #ifdef CONFIG_COMPAT
1962 static int proc_control_compat(struct usb_dev_state *ps,
1963 struct usbdevfs_ctrltransfer32 __user *p32)
1965 struct usbdevfs_ctrltransfer __user *p;
1967 p = compat_alloc_user_space(sizeof(*p));
1968 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1969 get_user(udata, &p32->data) ||
1970 put_user(compat_ptr(udata), &p->data))
1972 return proc_control(ps, p);
1975 static int proc_bulk_compat(struct usb_dev_state *ps,
1976 struct usbdevfs_bulktransfer32 __user *p32)
1978 struct usbdevfs_bulktransfer __user *p;
1980 compat_caddr_t addr;
1982 p = compat_alloc_user_space(sizeof(*p));
1984 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1985 get_user(n, &p32->len) || put_user(n, &p->len) ||
1986 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1987 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1990 return proc_bulk(ps, p);
1992 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1994 struct usbdevfs_disconnectsignal32 ds;
1996 if (copy_from_user(&ds, arg, sizeof(ds)))
1998 ps->discsignr = ds.signr;
1999 ps->disccontext = compat_ptr(ds.context);
2003 static int get_urb32(struct usbdevfs_urb *kurb,
2004 struct usbdevfs_urb32 __user *uurb)
2006 struct usbdevfs_urb32 urb32;
2007 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2009 kurb->type = urb32.type;
2010 kurb->endpoint = urb32.endpoint;
2011 kurb->status = urb32.status;
2012 kurb->flags = urb32.flags;
2013 kurb->buffer = compat_ptr(urb32.buffer);
2014 kurb->buffer_length = urb32.buffer_length;
2015 kurb->actual_length = urb32.actual_length;
2016 kurb->start_frame = urb32.start_frame;
2017 kurb->number_of_packets = urb32.number_of_packets;
2018 kurb->error_count = urb32.error_count;
2019 kurb->signr = urb32.signr;
2020 kurb->usercontext = compat_ptr(urb32.usercontext);
2024 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2026 struct usbdevfs_urb uurb;
2028 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2031 return proc_do_submiturb(ps, &uurb,
2032 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2036 static int processcompl_compat(struct async *as, void __user * __user *arg)
2038 struct urb *urb = as->urb;
2039 struct usbdevfs_urb32 __user *userurb = as->userurb;
2040 void __user *addr = as->userurb;
2043 compute_isochronous_actual_length(urb);
2044 if (as->userbuffer && urb->actual_length) {
2045 if (copy_urb_data_to_user(as->userbuffer, urb))
2048 if (put_user(as->status, &userurb->status))
2050 if (put_user(urb->actual_length, &userurb->actual_length))
2052 if (put_user(urb->error_count, &userurb->error_count))
2055 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2056 for (i = 0; i < urb->number_of_packets; i++) {
2057 if (put_user(urb->iso_frame_desc[i].actual_length,
2058 &userurb->iso_frame_desc[i].actual_length))
2060 if (put_user(urb->iso_frame_desc[i].status,
2061 &userurb->iso_frame_desc[i].status))
2066 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2071 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2073 struct async *as = reap_as(ps);
2078 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2079 retval = processcompl_compat(as, (void __user * __user *)arg);
2083 if (signal_pending(current))
2088 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2093 as = async_getcompleted(ps);
2095 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2096 retval = processcompl_compat(as, (void __user * __user *)arg);
2099 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2107 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2109 struct usbdevfs_disconnectsignal ds;
2111 if (copy_from_user(&ds, arg, sizeof(ds)))
2113 ps->discsignr = ds.signr;
2114 ps->disccontext = ds.context;
2118 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2122 if (get_user(ifnum, (unsigned int __user *)arg))
2124 return claimintf(ps, ifnum);
2127 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2132 if (get_user(ifnum, (unsigned int __user *)arg))
2134 ret = releaseintf(ps, ifnum);
2137 destroy_async_on_interface(ps, ifnum);
2141 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2146 struct usb_interface *intf = NULL;
2147 struct usb_driver *driver = NULL;
2149 if (ps->privileges_dropped)
2153 size = _IOC_SIZE(ctl->ioctl_code);
2155 buf = kmalloc(size, GFP_KERNEL);
2158 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2159 if (copy_from_user(buf, ctl->data, size)) {
2164 memset(buf, 0, size);
2168 if (!connected(ps)) {
2173 if (ps->dev->state != USB_STATE_CONFIGURED)
2174 retval = -EHOSTUNREACH;
2175 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2177 else switch (ctl->ioctl_code) {
2179 /* disconnect kernel driver from interface */
2180 case USBDEVFS_DISCONNECT:
2181 if (intf->dev.driver) {
2182 driver = to_usb_driver(intf->dev.driver);
2183 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2184 usb_driver_release_interface(driver, intf);
2189 /* let kernel drivers try to (re)bind to the interface */
2190 case USBDEVFS_CONNECT:
2191 if (!intf->dev.driver)
2192 retval = device_attach(&intf->dev);
2197 /* talk directly to the interface's driver */
2199 if (intf->dev.driver)
2200 driver = to_usb_driver(intf->dev.driver);
2201 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2204 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2205 if (retval == -ENOIOCTLCMD)
2210 /* cleanup and return */
2212 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2214 && copy_to_user(ctl->data, buf, size) != 0)
2221 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2223 struct usbdevfs_ioctl ctrl;
2225 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2227 return proc_ioctl(ps, &ctrl);
2230 #ifdef CONFIG_COMPAT
2231 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2233 struct usbdevfs_ioctl32 ioc32;
2234 struct usbdevfs_ioctl ctrl;
2236 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2238 ctrl.ifno = ioc32.ifno;
2239 ctrl.ioctl_code = ioc32.ioctl_code;
2240 ctrl.data = compat_ptr(ioc32.data);
2241 return proc_ioctl(ps, &ctrl);
2245 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2250 if (get_user(portnum, (unsigned __user *) arg))
2252 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2254 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2255 portnum, task_pid_nr(current), current->comm);
2259 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2263 if (get_user(portnum, (unsigned __user *) arg))
2265 return usb_hub_release_port(ps->dev, portnum, ps);
2268 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2272 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2273 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2274 USBDEVFS_CAP_DROP_PRIVILEGES;
2275 if (!ps->dev->bus->no_stop_on_short)
2276 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2277 if (ps->dev->bus->sg_tablesize)
2278 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2280 if (put_user(caps, (__u32 __user *)arg))
2286 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2288 struct usbdevfs_disconnect_claim dc;
2289 struct usb_interface *intf;
2291 if (copy_from_user(&dc, arg, sizeof(dc)))
2294 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2298 if (intf->dev.driver) {
2299 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2301 if (ps->privileges_dropped)
2304 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2305 strncmp(dc.driver, intf->dev.driver->name,
2306 sizeof(dc.driver)) != 0)
2309 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2310 strncmp(dc.driver, intf->dev.driver->name,
2311 sizeof(dc.driver)) == 0)
2314 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2315 usb_driver_release_interface(driver, intf);
2318 return claimintf(ps, dc.interface);
2321 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2323 unsigned num_streams, num_eps;
2324 struct usb_host_endpoint **eps;
2325 struct usb_interface *intf;
2328 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2333 destroy_async_on_interface(ps,
2334 intf->altsetting[0].desc.bInterfaceNumber);
2336 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2341 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2344 struct usb_host_endpoint **eps;
2345 struct usb_interface *intf;
2348 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2352 destroy_async_on_interface(ps,
2353 intf->altsetting[0].desc.bInterfaceNumber);
2355 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2360 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2364 if (copy_from_user(&data, arg, sizeof(data)))
2367 /* This is a one way operation. Once privileges are
2368 * dropped, you cannot regain them. You may however reissue
2369 * this ioctl to shrink the allowed interfaces mask.
2371 ps->interface_allowed_mask &= data;
2372 ps->privileges_dropped = true;
2378 * NOTE: All requests here that have interface numbers as parameters
2379 * are assuming that somehow the configuration has been prevented from
2380 * changing. But there's no mechanism to ensure that...
2382 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2385 struct usb_dev_state *ps = file->private_data;
2386 struct inode *inode = file_inode(file);
2387 struct usb_device *dev = ps->dev;
2390 if (!(file->f_mode & FMODE_WRITE))
2393 usb_lock_device(dev);
2395 /* Reap operations are allowed even after disconnection */
2397 case USBDEVFS_REAPURB:
2398 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2399 ret = proc_reapurb(ps, p);
2402 case USBDEVFS_REAPURBNDELAY:
2403 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2404 ret = proc_reapurbnonblock(ps, p);
2407 #ifdef CONFIG_COMPAT
2408 case USBDEVFS_REAPURB32:
2409 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2410 ret = proc_reapurb_compat(ps, p);
2413 case USBDEVFS_REAPURBNDELAY32:
2414 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2415 ret = proc_reapurbnonblock_compat(ps, p);
2420 if (!connected(ps)) {
2421 usb_unlock_device(dev);
2426 case USBDEVFS_CONTROL:
2427 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2428 ret = proc_control(ps, p);
2430 inode->i_mtime = current_time(inode);
2434 snoop(&dev->dev, "%s: BULK\n", __func__);
2435 ret = proc_bulk(ps, p);
2437 inode->i_mtime = current_time(inode);
2440 case USBDEVFS_RESETEP:
2441 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2442 ret = proc_resetep(ps, p);
2444 inode->i_mtime = current_time(inode);
2447 case USBDEVFS_RESET:
2448 snoop(&dev->dev, "%s: RESET\n", __func__);
2449 ret = proc_resetdevice(ps);
2452 case USBDEVFS_CLEAR_HALT:
2453 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2454 ret = proc_clearhalt(ps, p);
2456 inode->i_mtime = current_time(inode);
2459 case USBDEVFS_GETDRIVER:
2460 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2461 ret = proc_getdriver(ps, p);
2464 case USBDEVFS_CONNECTINFO:
2465 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2466 ret = proc_connectinfo(ps, p);
2469 case USBDEVFS_SETINTERFACE:
2470 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2471 ret = proc_setintf(ps, p);
2474 case USBDEVFS_SETCONFIGURATION:
2475 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2476 ret = proc_setconfig(ps, p);
2479 case USBDEVFS_SUBMITURB:
2480 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2481 ret = proc_submiturb(ps, p);
2483 inode->i_mtime = current_time(inode);
2486 #ifdef CONFIG_COMPAT
2487 case USBDEVFS_CONTROL32:
2488 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2489 ret = proc_control_compat(ps, p);
2491 inode->i_mtime = current_time(inode);
2494 case USBDEVFS_BULK32:
2495 snoop(&dev->dev, "%s: BULK32\n", __func__);
2496 ret = proc_bulk_compat(ps, p);
2498 inode->i_mtime = current_time(inode);
2501 case USBDEVFS_DISCSIGNAL32:
2502 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2503 ret = proc_disconnectsignal_compat(ps, p);
2506 case USBDEVFS_SUBMITURB32:
2507 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2508 ret = proc_submiturb_compat(ps, p);
2510 inode->i_mtime = current_time(inode);
2513 case USBDEVFS_IOCTL32:
2514 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2515 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2519 case USBDEVFS_DISCARDURB:
2520 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2521 ret = proc_unlinkurb(ps, p);
2524 case USBDEVFS_DISCSIGNAL:
2525 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2526 ret = proc_disconnectsignal(ps, p);
2529 case USBDEVFS_CLAIMINTERFACE:
2530 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2531 ret = proc_claiminterface(ps, p);
2534 case USBDEVFS_RELEASEINTERFACE:
2535 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2536 ret = proc_releaseinterface(ps, p);
2539 case USBDEVFS_IOCTL:
2540 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2541 ret = proc_ioctl_default(ps, p);
2544 case USBDEVFS_CLAIM_PORT:
2545 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2546 ret = proc_claim_port(ps, p);
2549 case USBDEVFS_RELEASE_PORT:
2550 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2551 ret = proc_release_port(ps, p);
2553 case USBDEVFS_GET_CAPABILITIES:
2554 ret = proc_get_capabilities(ps, p);
2556 case USBDEVFS_DISCONNECT_CLAIM:
2557 ret = proc_disconnect_claim(ps, p);
2559 case USBDEVFS_ALLOC_STREAMS:
2560 ret = proc_alloc_streams(ps, p);
2562 case USBDEVFS_FREE_STREAMS:
2563 ret = proc_free_streams(ps, p);
2565 case USBDEVFS_DROP_PRIVILEGES:
2566 ret = proc_drop_privileges(ps, p);
2568 case USBDEVFS_GET_SPEED:
2569 ret = ps->dev->speed;
2574 usb_unlock_device(dev);
2576 inode->i_atime = current_time(inode);
2580 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2585 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2590 #ifdef CONFIG_COMPAT
2591 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2596 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2602 /* No kernel lock - fine */
2603 static __poll_t usbdev_poll(struct file *file,
2604 struct poll_table_struct *wait)
2606 struct usb_dev_state *ps = file->private_data;
2609 poll_wait(file, &ps->wait, wait);
2610 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2611 mask |= EPOLLOUT | EPOLLWRNORM;
2614 if (list_empty(&ps->list))
2619 const struct file_operations usbdev_file_operations = {
2620 .owner = THIS_MODULE,
2621 .llseek = no_seek_end_llseek,
2622 .read = usbdev_read,
2623 .poll = usbdev_poll,
2624 .unlocked_ioctl = usbdev_ioctl,
2625 #ifdef CONFIG_COMPAT
2626 .compat_ioctl = usbdev_compat_ioctl,
2628 .mmap = usbdev_mmap,
2629 .open = usbdev_open,
2630 .release = usbdev_release,
2633 static void usbdev_remove(struct usb_device *udev)
2635 struct usb_dev_state *ps;
2636 struct siginfo sinfo;
2638 while (!list_empty(&udev->filelist)) {
2639 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2640 destroy_all_async(ps);
2641 wake_up_all(&ps->wait);
2642 list_del_init(&ps->list);
2643 if (ps->discsignr) {
2644 clear_siginfo(&sinfo);
2645 sinfo.si_signo = ps->discsignr;
2646 sinfo.si_errno = EPIPE;
2647 sinfo.si_code = SI_ASYNCIO;
2648 sinfo.si_addr = ps->disccontext;
2649 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2650 ps->disc_pid, ps->cred);
2655 static int usbdev_notify(struct notifier_block *self,
2656 unsigned long action, void *dev)
2659 case USB_DEVICE_ADD:
2661 case USB_DEVICE_REMOVE:
2668 static struct notifier_block usbdev_nb = {
2669 .notifier_call = usbdev_notify,
2672 static struct cdev usb_device_cdev;
2674 int __init usb_devio_init(void)
2678 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2681 printk(KERN_ERR "Unable to register minors for usb_device\n");
2684 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2685 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2687 printk(KERN_ERR "Unable to get usb_device major %d\n",
2691 usb_register_notify(&usbdev_nb);
2696 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2700 void usb_devio_cleanup(void)
2702 usb_unregister_notify(&usbdev_nb);
2703 cdev_del(&usb_device_cdev);
2704 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);