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USB: BKL removal from ioctl path of usbfs
[linux-2.6/libata-dev.git] / drivers / usb / core / devio.c
blobe59efea9410f60f6a67520944ef2c0a74518d8d5
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h" /* for usbcore internals */
54 #include "usb.h"
55 #include "hub.h"
56
57 #define USB_MAXBUS 64
58 #define USB_DEVICE_MAX USB_MAXBUS * 128
59
60 /* Mutual exclusion for removal, open, and release */
61 DEFINE_MUTEX(usbfs_mutex);
62
63 struct dev_state {
64 struct list_head list; /* state list */
65 struct usb_device *dev;
66 struct file *file;
67 spinlock_t lock; /* protects the async urb lists */
68 struct list_head async_pending;
69 struct list_head async_completed;
70 wait_queue_head_t wait; /* wake up if a request completed */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 uid_t disc_uid, disc_euid;
74 void __user *disccontext;
75 unsigned long ifclaimed;
76 u32 secid;
77 u32 disabled_bulk_eps;
78 };
79
80 struct async {
81 struct list_head asynclist;
82 struct dev_state *ps;
83 struct pid *pid;
84 uid_t uid, euid;
85 unsigned int signr;
86 unsigned int ifnum;
87 void __user *userbuffer;
88 void __user *userurb;
89 struct urb *urb;
90 int status;
91 u32 secid;
92 u8 bulk_addr;
93 u8 bulk_status;
94 };
95
96 static int usbfs_snoop;
97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
99
100 #define snoop(dev, format, arg...) \
101 do { \
102 if (usbfs_snoop) \
103 dev_info(dev , format , ## arg); \
104 } while (0)
105
106 enum snoop_when {
107 SUBMIT, COMPLETE
108 };
109
110 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
111
112 #define MAX_USBFS_BUFFER_SIZE 16384
113
114
115 static int connected(struct dev_state *ps)
116 {
117 return (!list_empty(&ps->list) &&
118 ps->dev->state != USB_STATE_NOTATTACHED);
119 }
120
121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
122 {
123 loff_t ret;
124
125 mutex_lock(&file->f_dentry->d_inode->i_mutex);
126
127 switch (orig) {
128 case 0:
129 file->f_pos = offset;
130 ret = file->f_pos;
131 break;
132 case 1:
133 file->f_pos += offset;
134 ret = file->f_pos;
135 break;
136 case 2:
137 default:
138 ret = -EINVAL;
139 }
140
141 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
142 return ret;
143 }
144
145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
146 loff_t *ppos)
147 {
148 struct dev_state *ps = file->private_data;
149 struct usb_device *dev = ps->dev;
150 ssize_t ret = 0;
151 unsigned len;
152 loff_t pos;
153 int i;
154
155 pos = *ppos;
156 usb_lock_device(dev);
157 if (!connected(ps)) {
158 ret = -ENODEV;
159 goto err;
160 } else if (pos < 0) {
161 ret = -EINVAL;
162 goto err;
163 }
164
165 if (pos < sizeof(struct usb_device_descriptor)) {
166 /* 18 bytes - fits on the stack */
167 struct usb_device_descriptor temp_desc;
168
169 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
170 le16_to_cpus(&temp_desc.bcdUSB);
171 le16_to_cpus(&temp_desc.idVendor);
172 le16_to_cpus(&temp_desc.idProduct);
173 le16_to_cpus(&temp_desc.bcdDevice);
174
175 len = sizeof(struct usb_device_descriptor) - pos;
176 if (len > nbytes)
177 len = nbytes;
178 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
179 ret = -EFAULT;
180 goto err;
181 }
182
183 *ppos += len;
184 buf += len;
185 nbytes -= len;
186 ret += len;
187 }
188
189 pos = sizeof(struct usb_device_descriptor);
190 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
191 struct usb_config_descriptor *config =
192 (struct usb_config_descriptor *)dev->rawdescriptors[i];
193 unsigned int length = le16_to_cpu(config->wTotalLength);
194
195 if (*ppos < pos + length) {
196
197 /* The descriptor may claim to be longer than it
198 * really is. Here is the actual allocated length. */
199 unsigned alloclen =
200 le16_to_cpu(dev->config[i].desc.wTotalLength);
201
202 len = length - (*ppos - pos);
203 if (len > nbytes)
204 len = nbytes;
205
206 /* Simply don't write (skip over) unallocated parts */
207 if (alloclen > (*ppos - pos)) {
208 alloclen -= (*ppos - pos);
209 if (copy_to_user(buf,
210 dev->rawdescriptors[i] + (*ppos - pos),
211 min(len, alloclen))) {
212 ret = -EFAULT;
213 goto err;
214 }
215 }
216
217 *ppos += len;
218 buf += len;
219 nbytes -= len;
220 ret += len;
221 }
222
223 pos += length;
224 }
225
226 err:
227 usb_unlock_device(dev);
228 return ret;
229 }
230
231 /*
232 * async list handling
233 */
234
235 static struct async *alloc_async(unsigned int numisoframes)
236 {
237 struct async *as;
238
239 as = kzalloc(sizeof(struct async), GFP_KERNEL);
240 if (!as)
241 return NULL;
242 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
243 if (!as->urb) {
244 kfree(as);
245 return NULL;
246 }
247 return as;
248 }
249
250 static void free_async(struct async *as)
251 {
252 put_pid(as->pid);
253 kfree(as->urb->transfer_buffer);
254 kfree(as->urb->setup_packet);
255 usb_free_urb(as->urb);
256 kfree(as);
257 }
258
259 static void async_newpending(struct async *as)
260 {
261 struct dev_state *ps = as->ps;
262 unsigned long flags;
263
264 spin_lock_irqsave(&ps->lock, flags);
265 list_add_tail(&as->asynclist, &ps->async_pending);
266 spin_unlock_irqrestore(&ps->lock, flags);
267 }
268
269 static void async_removepending(struct async *as)
270 {
271 struct dev_state *ps = as->ps;
272 unsigned long flags;
273
274 spin_lock_irqsave(&ps->lock, flags);
275 list_del_init(&as->asynclist);
276 spin_unlock_irqrestore(&ps->lock, flags);
277 }
278
279 static struct async *async_getcompleted(struct dev_state *ps)
280 {
281 unsigned long flags;
282 struct async *as = NULL;
283
284 spin_lock_irqsave(&ps->lock, flags);
285 if (!list_empty(&ps->async_completed)) {
286 as = list_entry(ps->async_completed.next, struct async,
287 asynclist);
288 list_del_init(&as->asynclist);
289 }
290 spin_unlock_irqrestore(&ps->lock, flags);
291 return as;
292 }
293
294 static struct async *async_getpending(struct dev_state *ps,
295 void __user *userurb)
296 {
297 unsigned long flags;
298 struct async *as;
299
300 spin_lock_irqsave(&ps->lock, flags);
301 list_for_each_entry(as, &ps->async_pending, asynclist)
302 if (as->userurb == userurb) {
303 list_del_init(&as->asynclist);
304 spin_unlock_irqrestore(&ps->lock, flags);
305 return as;
306 }
307 spin_unlock_irqrestore(&ps->lock, flags);
308 return NULL;
309 }
310
311 static void snoop_urb(struct usb_device *udev,
312 void __user *userurb, int pipe, unsigned length,
313 int timeout_or_status, enum snoop_when when)
314 {
315 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
316 static const char *dirs[] = {"out", "in"};
317 int ep;
318 const char *t, *d;
319
320 if (!usbfs_snoop)
321 return;
322
323 ep = usb_pipeendpoint(pipe);
324 t = types[usb_pipetype(pipe)];
325 d = dirs[!!usb_pipein(pipe)];
326
327 if (userurb) { /* Async */
328 if (when == SUBMIT)
329 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
330 "length %u\n",
331 userurb, ep, t, d, length);
332 else
333 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
334 "actual_length %u status %d\n",
335 userurb, ep, t, d, length,
336 timeout_or_status);
337 } else {
338 if (when == SUBMIT)
339 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
340 "timeout %d\n",
341 ep, t, d, length, timeout_or_status);
342 else
343 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
344 "status %d\n",
345 ep, t, d, length, timeout_or_status);
346 }
347 }
348
349 #define AS_CONTINUATION 1
350 #define AS_UNLINK 2
351
352 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
353 __releases(ps->lock)
354 __acquires(ps->lock)
355 {
356 struct async *as;
357
358 /* Mark all the pending URBs that match bulk_addr, up to but not
359 * including the first one without AS_CONTINUATION. If such an
360 * URB is encountered then a new transfer has already started so
361 * the endpoint doesn't need to be disabled; otherwise it does.
362 */
363 list_for_each_entry(as, &ps->async_pending, asynclist) {
364 if (as->bulk_addr == bulk_addr) {
365 if (as->bulk_status != AS_CONTINUATION)
366 goto rescan;
367 as->bulk_status = AS_UNLINK;
368 as->bulk_addr = 0;
369 }
370 }
371 ps->disabled_bulk_eps |= (1 << bulk_addr);
372
373 /* Now carefully unlink all the marked pending URBs */
374 rescan:
375 list_for_each_entry(as, &ps->async_pending, asynclist) {
376 if (as->bulk_status == AS_UNLINK) {
377 as->bulk_status = 0; /* Only once */
378 spin_unlock(&ps->lock); /* Allow completions */
379 usb_unlink_urb(as->urb);
380 spin_lock(&ps->lock);
381 goto rescan;
382 }
383 }
384 }
385
386 static void async_completed(struct urb *urb)
387 {
388 struct async *as = urb->context;
389 struct dev_state *ps = as->ps;
390 struct siginfo sinfo;
391 struct pid *pid = NULL;
392 uid_t uid = 0;
393 uid_t euid = 0;
394 u32 secid = 0;
395 int signr;
396
397 spin_lock(&ps->lock);
398 list_move_tail(&as->asynclist, &ps->async_completed);
399 as->status = urb->status;
400 signr = as->signr;
401 if (signr) {
402 sinfo.si_signo = as->signr;
403 sinfo.si_errno = as->status;
404 sinfo.si_code = SI_ASYNCIO;
405 sinfo.si_addr = as->userurb;
406 pid = as->pid;
407 uid = as->uid;
408 euid = as->euid;
409 secid = as->secid;
410 }
411 snoop(&urb->dev->dev, "urb complete\n");
412 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
413 as->status, COMPLETE);
414 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
415 as->status != -ENOENT)
416 cancel_bulk_urbs(ps, as->bulk_addr);
417 spin_unlock(&ps->lock);
418
419 if (signr)
420 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
421 euid, secid);
422
423 wake_up(&ps->wait);
424 }
425
426 static void destroy_async(struct dev_state *ps, struct list_head *list)
427 {
428 struct async *as;
429 unsigned long flags;
430
431 spin_lock_irqsave(&ps->lock, flags);
432 while (!list_empty(list)) {
433 as = list_entry(list->next, struct async, asynclist);
434 list_del_init(&as->asynclist);
435
436 /* drop the spinlock so the completion handler can run */
437 spin_unlock_irqrestore(&ps->lock, flags);
438 usb_kill_urb(as->urb);
439 spin_lock_irqsave(&ps->lock, flags);
440 }
441 spin_unlock_irqrestore(&ps->lock, flags);
442 }
443
444 static void destroy_async_on_interface(struct dev_state *ps,
445 unsigned int ifnum)
446 {
447 struct list_head *p, *q, hitlist;
448 unsigned long flags;
449
450 INIT_LIST_HEAD(&hitlist);
451 spin_lock_irqsave(&ps->lock, flags);
452 list_for_each_safe(p, q, &ps->async_pending)
453 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
454 list_move_tail(p, &hitlist);
455 spin_unlock_irqrestore(&ps->lock, flags);
456 destroy_async(ps, &hitlist);
457 }
458
459 static void destroy_all_async(struct dev_state *ps)
460 {
461 destroy_async(ps, &ps->async_pending);
462 }
463
464 /*
465 * interface claims are made only at the request of user level code,
466 * which can also release them (explicitly or by closing files).
467 * they're also undone when devices disconnect.
468 */
469
470 static int driver_probe(struct usb_interface *intf,
471 const struct usb_device_id *id)
472 {
473 return -ENODEV;
474 }
475
476 static void driver_disconnect(struct usb_interface *intf)
477 {
478 struct dev_state *ps = usb_get_intfdata(intf);
479 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
480
481 if (!ps)
482 return;
483
484 /* NOTE: this relies on usbcore having canceled and completed
485 * all pending I/O requests; 2.6 does that.
486 */
487
488 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
489 clear_bit(ifnum, &ps->ifclaimed);
490 else
491 dev_warn(&intf->dev, "interface number %u out of range\n",
492 ifnum);
493
494 usb_set_intfdata(intf, NULL);
495
496 /* force async requests to complete */
497 destroy_async_on_interface(ps, ifnum);
498 }
499
500 /* The following routines are merely placeholders. There is no way
501 * to inform a user task about suspend or resumes.
502 */
503 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
504 {
505 return 0;
506 }
507
508 static int driver_resume(struct usb_interface *intf)
509 {
510 return 0;
511 }
512
513 struct usb_driver usbfs_driver = {
514 .name = "usbfs",
515 .probe = driver_probe,
516 .disconnect = driver_disconnect,
517 .suspend = driver_suspend,
518 .resume = driver_resume,
519 };
520
521 static int claimintf(struct dev_state *ps, unsigned int ifnum)
522 {
523 struct usb_device *dev = ps->dev;
524 struct usb_interface *intf;
525 int err;
526
527 if (ifnum >= 8*sizeof(ps->ifclaimed))
528 return -EINVAL;
529 /* already claimed */
530 if (test_bit(ifnum, &ps->ifclaimed))
531 return 0;
532
533 intf = usb_ifnum_to_if(dev, ifnum);
534 if (!intf)
535 err = -ENOENT;
536 else
537 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
538 if (err == 0)
539 set_bit(ifnum, &ps->ifclaimed);
540 return err;
541 }
542
543 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
544 {
545 struct usb_device *dev;
546 struct usb_interface *intf;
547 int err;
548
549 err = -EINVAL;
550 if (ifnum >= 8*sizeof(ps->ifclaimed))
551 return err;
552 dev = ps->dev;
553 intf = usb_ifnum_to_if(dev, ifnum);
554 if (!intf)
555 err = -ENOENT;
556 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
557 usb_driver_release_interface(&usbfs_driver, intf);
558 err = 0;
559 }
560 return err;
561 }
562
563 static int checkintf(struct dev_state *ps, unsigned int ifnum)
564 {
565 if (ps->dev->state != USB_STATE_CONFIGURED)
566 return -EHOSTUNREACH;
567 if (ifnum >= 8*sizeof(ps->ifclaimed))
568 return -EINVAL;
569 if (test_bit(ifnum, &ps->ifclaimed))
570 return 0;
571 /* if not yet claimed, claim it for the driver */
572 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
573 "interface %u before use\n", task_pid_nr(current),
574 current->comm, ifnum);
575 return claimintf(ps, ifnum);
576 }
577
578 static int findintfep(struct usb_device *dev, unsigned int ep)
579 {
580 unsigned int i, j, e;
581 struct usb_interface *intf;
582 struct usb_host_interface *alts;
583 struct usb_endpoint_descriptor *endpt;
584
585 if (ep & ~(USB_DIR_IN|0xf))
586 return -EINVAL;
587 if (!dev->actconfig)
588 return -ESRCH;
589 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
590 intf = dev->actconfig->interface[i];
591 for (j = 0; j < intf->num_altsetting; j++) {
592 alts = &intf->altsetting[j];
593 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
594 endpt = &alts->endpoint[e].desc;
595 if (endpt->bEndpointAddress == ep)
596 return alts->desc.bInterfaceNumber;
597 }
598 }
599 }
600 return -ENOENT;
601 }
602
603 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
604 unsigned int index)
605 {
606 int ret = 0;
607
608 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
609 && ps->dev->state != USB_STATE_ADDRESS
610 && ps->dev->state != USB_STATE_CONFIGURED)
611 return -EHOSTUNREACH;
612 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
613 return 0;
614
615 index &= 0xff;
616 switch (requesttype & USB_RECIP_MASK) {
617 case USB_RECIP_ENDPOINT:
618 ret = findintfep(ps->dev, index);
619 if (ret >= 0)
620 ret = checkintf(ps, ret);
621 break;
622
623 case USB_RECIP_INTERFACE:
624 ret = checkintf(ps, index);
625 break;
626 }
627 return ret;
628 }
629
630 static int match_devt(struct device *dev, void *data)
631 {
632 return dev->devt == (dev_t) (unsigned long) data;
633 }
634
635 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
636 {
637 struct device *dev;
638
639 dev = bus_find_device(&usb_bus_type, NULL,
640 (void *) (unsigned long) devt, match_devt);
641 if (!dev)
642 return NULL;
643 return container_of(dev, struct usb_device, dev);
644 }
645
646 /*
647 * file operations
648 */
649 static int usbdev_open(struct inode *inode, struct file *file)
650 {
651 struct usb_device *dev = NULL;
652 struct dev_state *ps;
653 const struct cred *cred = current_cred();
654 int ret;
655
656 ret = -ENOMEM;
657 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
658 if (!ps)
659 goto out_free_ps;
660
661 ret = -ENODEV;
662
663 /* Protect against simultaneous removal or release */
664 mutex_lock(&usbfs_mutex);
665
666 /* usbdev device-node */
667 if (imajor(inode) == USB_DEVICE_MAJOR)
668 dev = usbdev_lookup_by_devt(inode->i_rdev);
669
670 #ifdef CONFIG_USB_DEVICEFS
671 /* procfs file */
672 if (!dev) {
673 dev = inode->i_private;
674 if (dev && dev->usbfs_dentry &&
675 dev->usbfs_dentry->d_inode == inode)
676 usb_get_dev(dev);
677 else
678 dev = NULL;
679 }
680 #endif
681 mutex_unlock(&usbfs_mutex);
682
683 if (!dev)
684 goto out_free_ps;
685
686 usb_lock_device(dev);
687 if (dev->state == USB_STATE_NOTATTACHED)
688 goto out_unlock_device;
689
690 ret = usb_autoresume_device(dev);
691 if (ret)
692 goto out_unlock_device;
693
694 ps->dev = dev;
695 ps->file = file;
696 spin_lock_init(&ps->lock);
697 INIT_LIST_HEAD(&ps->list);
698 INIT_LIST_HEAD(&ps->async_pending);
699 INIT_LIST_HEAD(&ps->async_completed);
700 init_waitqueue_head(&ps->wait);
701 ps->discsignr = 0;
702 ps->disc_pid = get_pid(task_pid(current));
703 ps->disc_uid = cred->uid;
704 ps->disc_euid = cred->euid;
705 ps->disccontext = NULL;
706 ps->ifclaimed = 0;
707 security_task_getsecid(current, &ps->secid);
708 smp_wmb();
709 list_add_tail(&ps->list, &dev->filelist);
710 file->private_data = ps;
711 usb_unlock_device(dev);
712 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
713 current->comm);
714 return ret;
715
716 out_unlock_device:
717 usb_unlock_device(dev);
718 usb_put_dev(dev);
719 out_free_ps:
720 kfree(ps);
721 return ret;
722 }
723
724 static int usbdev_release(struct inode *inode, struct file *file)
725 {
726 struct dev_state *ps = file->private_data;
727 struct usb_device *dev = ps->dev;
728 unsigned int ifnum;
729 struct async *as;
730
731 usb_lock_device(dev);
732 usb_hub_release_all_ports(dev, ps);
733
734 list_del_init(&ps->list);
735
736 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
737 ifnum++) {
738 if (test_bit(ifnum, &ps->ifclaimed))
739 releaseintf(ps, ifnum);
740 }
741 destroy_all_async(ps);
742 usb_autosuspend_device(dev);
743 usb_unlock_device(dev);
744 usb_put_dev(dev);
745 put_pid(ps->disc_pid);
746
747 as = async_getcompleted(ps);
748 while (as) {
749 free_async(as);
750 as = async_getcompleted(ps);
751 }
752 kfree(ps);
753 return 0;
754 }
755
756 static int proc_control(struct dev_state *ps, void __user *arg)
757 {
758 struct usb_device *dev = ps->dev;
759 struct usbdevfs_ctrltransfer ctrl;
760 unsigned int tmo;
761 unsigned char *tbuf;
762 unsigned wLength;
763 int i, pipe, ret;
764
765 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
766 return -EFAULT;
767 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
768 if (ret)
769 return ret;
770 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
771 if (wLength > PAGE_SIZE)
772 return -EINVAL;
773 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
774 if (!tbuf)
775 return -ENOMEM;
776 tmo = ctrl.timeout;
777 if (ctrl.bRequestType & 0x80) {
778 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
779 ctrl.wLength)) {
780 free_page((unsigned long)tbuf);
781 return -EINVAL;
782 }
783 pipe = usb_rcvctrlpipe(dev, 0);
784 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
785
786 usb_unlock_device(dev);
787 i = usb_control_msg(dev, pipe, ctrl.bRequest,
788 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
789 tbuf, ctrl.wLength, tmo);
790 usb_lock_device(dev);
791 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
792
793 if ((i > 0) && ctrl.wLength) {
794 if (copy_to_user(ctrl.data, tbuf, i)) {
795 free_page((unsigned long)tbuf);
796 return -EFAULT;
797 }
798 }
799 } else {
800 if (ctrl.wLength) {
801 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
802 free_page((unsigned long)tbuf);
803 return -EFAULT;
804 }
805 }
806 pipe = usb_sndctrlpipe(dev, 0);
807 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
808
809 usb_unlock_device(dev);
810 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
811 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
812 tbuf, ctrl.wLength, tmo);
813 usb_lock_device(dev);
814 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
815 }
816 free_page((unsigned long)tbuf);
817 if (i < 0 && i != -EPIPE) {
818 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
819 "failed cmd %s rqt %u rq %u len %u ret %d\n",
820 current->comm, ctrl.bRequestType, ctrl.bRequest,
821 ctrl.wLength, i);
822 }
823 return i;
824 }
825
826 static int proc_bulk(struct dev_state *ps, void __user *arg)
827 {
828 struct usb_device *dev = ps->dev;
829 struct usbdevfs_bulktransfer bulk;
830 unsigned int tmo, len1, pipe;
831 int len2;
832 unsigned char *tbuf;
833 int i, ret;
834
835 if (copy_from_user(&bulk, arg, sizeof(bulk)))
836 return -EFAULT;
837 ret = findintfep(ps->dev, bulk.ep);
838 if (ret < 0)
839 return ret;
840 ret = checkintf(ps, ret);
841 if (ret)
842 return ret;
843 if (bulk.ep & USB_DIR_IN)
844 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
845 else
846 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
847 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
848 return -EINVAL;
849 len1 = bulk.len;
850 if (len1 > MAX_USBFS_BUFFER_SIZE)
851 return -EINVAL;
852 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
853 return -ENOMEM;
854 tmo = bulk.timeout;
855 if (bulk.ep & 0x80) {
856 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
857 kfree(tbuf);
858 return -EINVAL;
859 }
860 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
861
862 usb_unlock_device(dev);
863 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
864 usb_lock_device(dev);
865 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
866
867 if (!i && len2) {
868 if (copy_to_user(bulk.data, tbuf, len2)) {
869 kfree(tbuf);
870 return -EFAULT;
871 }
872 }
873 } else {
874 if (len1) {
875 if (copy_from_user(tbuf, bulk.data, len1)) {
876 kfree(tbuf);
877 return -EFAULT;
878 }
879 }
880 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
881
882 usb_unlock_device(dev);
883 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
884 usb_lock_device(dev);
885 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
886 }
887 kfree(tbuf);
888 if (i < 0)
889 return i;
890 return len2;
891 }
892
893 static int proc_resetep(struct dev_state *ps, void __user *arg)
894 {
895 unsigned int ep;
896 int ret;
897
898 if (get_user(ep, (unsigned int __user *)arg))
899 return -EFAULT;
900 ret = findintfep(ps->dev, ep);
901 if (ret < 0)
902 return ret;
903 ret = checkintf(ps, ret);
904 if (ret)
905 return ret;
906 usb_reset_endpoint(ps->dev, ep);
907 return 0;
908 }
909
910 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
911 {
912 unsigned int ep;
913 int pipe;
914 int ret;
915
916 if (get_user(ep, (unsigned int __user *)arg))
917 return -EFAULT;
918 ret = findintfep(ps->dev, ep);
919 if (ret < 0)
920 return ret;
921 ret = checkintf(ps, ret);
922 if (ret)
923 return ret;
924 if (ep & USB_DIR_IN)
925 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
926 else
927 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
928
929 return usb_clear_halt(ps->dev, pipe);
930 }
931
932 static int proc_getdriver(struct dev_state *ps, void __user *arg)
933 {
934 struct usbdevfs_getdriver gd;
935 struct usb_interface *intf;
936 int ret;
937
938 if (copy_from_user(&gd, arg, sizeof(gd)))
939 return -EFAULT;
940 intf = usb_ifnum_to_if(ps->dev, gd.interface);
941 if (!intf || !intf->dev.driver)
942 ret = -ENODATA;
943 else {
944 strncpy(gd.driver, intf->dev.driver->name,
945 sizeof(gd.driver));
946 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
947 }
948 return ret;
949 }
950
951 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
952 {
953 struct usbdevfs_connectinfo ci;
954
955 ci.devnum = ps->dev->devnum;
956 ci.slow = ps->dev->speed == USB_SPEED_LOW;
957 if (copy_to_user(arg, &ci, sizeof(ci)))
958 return -EFAULT;
959 return 0;
960 }
961
962 static int proc_resetdevice(struct dev_state *ps)
963 {
964 return usb_reset_device(ps->dev);
965 }
966
967 static int proc_setintf(struct dev_state *ps, void __user *arg)
968 {
969 struct usbdevfs_setinterface setintf;
970 int ret;
971
972 if (copy_from_user(&setintf, arg, sizeof(setintf)))
973 return -EFAULT;
974 if ((ret = checkintf(ps, setintf.interface)))
975 return ret;
976 return usb_set_interface(ps->dev, setintf.interface,
977 setintf.altsetting);
978 }
979
980 static int proc_setconfig(struct dev_state *ps, void __user *arg)
981 {
982 int u;
983 int status = 0;
984 struct usb_host_config *actconfig;
985
986 if (get_user(u, (int __user *)arg))
987 return -EFAULT;
988
989 actconfig = ps->dev->actconfig;
990
991 /* Don't touch the device if any interfaces are claimed.
992 * It could interfere with other drivers' operations, and if
993 * an interface is claimed by usbfs it could easily deadlock.
994 */
995 if (actconfig) {
996 int i;
997
998 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
999 if (usb_interface_claimed(actconfig->interface[i])) {
1000 dev_warn(&ps->dev->dev,
1001 "usbfs: interface %d claimed by %s "
1002 "while '%s' sets config #%d\n",
1003 actconfig->interface[i]
1004 ->cur_altsetting
1005 ->desc.bInterfaceNumber,
1006 actconfig->interface[i]
1007 ->dev.driver->name,
1008 current->comm, u);
1009 status = -EBUSY;
1010 break;
1011 }
1012 }
1013 }
1014
1015 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1016 * so avoid usb_set_configuration()'s kick to sysfs
1017 */
1018 if (status == 0) {
1019 if (actconfig && actconfig->desc.bConfigurationValue == u)
1020 status = usb_reset_configuration(ps->dev);
1021 else
1022 status = usb_set_configuration(ps->dev, u);
1023 }
1024
1025 return status;
1026 }
1027
1028 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1029 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1030 void __user *arg)
1031 {
1032 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1033 struct usb_host_endpoint *ep;
1034 struct async *as;
1035 struct usb_ctrlrequest *dr = NULL;
1036 const struct cred *cred = current_cred();
1037 unsigned int u, totlen, isofrmlen;
1038 int ret, ifnum = -1;
1039 int is_in;
1040
1041 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1042 USBDEVFS_URB_SHORT_NOT_OK |
1043 USBDEVFS_URB_BULK_CONTINUATION |
1044 USBDEVFS_URB_NO_FSBR |
1045 USBDEVFS_URB_ZERO_PACKET |
1046 USBDEVFS_URB_NO_INTERRUPT))
1047 return -EINVAL;
1048 if (uurb->buffer_length > 0 && !uurb->buffer)
1049 return -EINVAL;
1050 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1051 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1052 ifnum = findintfep(ps->dev, uurb->endpoint);
1053 if (ifnum < 0)
1054 return ifnum;
1055 ret = checkintf(ps, ifnum);
1056 if (ret)
1057 return ret;
1058 }
1059 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1060 is_in = 1;
1061 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1062 } else {
1063 is_in = 0;
1064 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1065 }
1066 if (!ep)
1067 return -ENOENT;
1068 switch(uurb->type) {
1069 case USBDEVFS_URB_TYPE_CONTROL:
1070 if (!usb_endpoint_xfer_control(&ep->desc))
1071 return -EINVAL;
1072 /* min 8 byte setup packet,
1073 * max 8 byte setup plus an arbitrary data stage */
1074 if (uurb->buffer_length < 8 ||
1075 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1076 return -EINVAL;
1077 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1078 if (!dr)
1079 return -ENOMEM;
1080 if (copy_from_user(dr, uurb->buffer, 8)) {
1081 kfree(dr);
1082 return -EFAULT;
1083 }
1084 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1085 kfree(dr);
1086 return -EINVAL;
1087 }
1088 ret = check_ctrlrecip(ps, dr->bRequestType,
1089 le16_to_cpup(&dr->wIndex));
1090 if (ret) {
1091 kfree(dr);
1092 return ret;
1093 }
1094 uurb->number_of_packets = 0;
1095 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1096 uurb->buffer += 8;
1097 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1098 is_in = 1;
1099 uurb->endpoint |= USB_DIR_IN;
1100 } else {
1101 is_in = 0;
1102 uurb->endpoint &= ~USB_DIR_IN;
1103 }
1104 break;
1105
1106 case USBDEVFS_URB_TYPE_BULK:
1107 switch (usb_endpoint_type(&ep->desc)) {
1108 case USB_ENDPOINT_XFER_CONTROL:
1109 case USB_ENDPOINT_XFER_ISOC:
1110 return -EINVAL;
1111 case USB_ENDPOINT_XFER_INT:
1112 /* allow single-shot interrupt transfers */
1113 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1114 goto interrupt_urb;
1115 }
1116 uurb->number_of_packets = 0;
1117 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1118 return -EINVAL;
1119 break;
1120
1121 case USBDEVFS_URB_TYPE_INTERRUPT:
1122 if (!usb_endpoint_xfer_int(&ep->desc))
1123 return -EINVAL;
1124 interrupt_urb:
1125 uurb->number_of_packets = 0;
1126 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1127 return -EINVAL;
1128 break;
1129
1130 case USBDEVFS_URB_TYPE_ISO:
1131 /* arbitrary limit */
1132 if (uurb->number_of_packets < 1 ||
1133 uurb->number_of_packets > 128)
1134 return -EINVAL;
1135 if (!usb_endpoint_xfer_isoc(&ep->desc))
1136 return -EINVAL;
1137 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1138 uurb->number_of_packets;
1139 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1140 return -ENOMEM;
1141 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1142 kfree(isopkt);
1143 return -EFAULT;
1144 }
1145 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1146 /* arbitrary limit,
1147 * sufficient for USB 2.0 high-bandwidth iso */
1148 if (isopkt[u].length > 8192) {
1149 kfree(isopkt);
1150 return -EINVAL;
1151 }
1152 totlen += isopkt[u].length;
1153 }
1154 /* 3072 * 64 microframes */
1155 if (totlen > 196608) {
1156 kfree(isopkt);
1157 return -EINVAL;
1158 }
1159 uurb->buffer_length = totlen;
1160 break;
1161
1162 default:
1163 return -EINVAL;
1164 }
1165 if (uurb->buffer_length > 0 &&
1166 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1167 uurb->buffer, uurb->buffer_length)) {
1168 kfree(isopkt);
1169 kfree(dr);
1170 return -EFAULT;
1171 }
1172 as = alloc_async(uurb->number_of_packets);
1173 if (!as) {
1174 kfree(isopkt);
1175 kfree(dr);
1176 return -ENOMEM;
1177 }
1178 if (uurb->buffer_length > 0) {
1179 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1180 GFP_KERNEL);
1181 if (!as->urb->transfer_buffer) {
1182 kfree(isopkt);
1183 kfree(dr);
1184 free_async(as);
1185 return -ENOMEM;
1186 }
1187 }
1188 as->urb->dev = ps->dev;
1189 as->urb->pipe = (uurb->type << 30) |
1190 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1191 (uurb->endpoint & USB_DIR_IN);
1192
1193 /* This tedious sequence is necessary because the URB_* flags
1194 * are internal to the kernel and subject to change, whereas
1195 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1196 */
1197 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1198 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1199 u |= URB_ISO_ASAP;
1200 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1201 u |= URB_SHORT_NOT_OK;
1202 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1203 u |= URB_NO_FSBR;
1204 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1205 u |= URB_ZERO_PACKET;
1206 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1207 u |= URB_NO_INTERRUPT;
1208 as->urb->transfer_flags = u;
1209
1210 as->urb->transfer_buffer_length = uurb->buffer_length;
1211 as->urb->setup_packet = (unsigned char *)dr;
1212 as->urb->start_frame = uurb->start_frame;
1213 as->urb->number_of_packets = uurb->number_of_packets;
1214 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1215 ps->dev->speed == USB_SPEED_HIGH)
1216 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1217 else
1218 as->urb->interval = ep->desc.bInterval;
1219 as->urb->context = as;
1220 as->urb->complete = async_completed;
1221 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1222 as->urb->iso_frame_desc[u].offset = totlen;
1223 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1224 totlen += isopkt[u].length;
1225 }
1226 kfree(isopkt);
1227 as->ps = ps;
1228 as->userurb = arg;
1229 if (is_in && uurb->buffer_length > 0)
1230 as->userbuffer = uurb->buffer;
1231 else
1232 as->userbuffer = NULL;
1233 as->signr = uurb->signr;
1234 as->ifnum = ifnum;
1235 as->pid = get_pid(task_pid(current));
1236 as->uid = cred->uid;
1237 as->euid = cred->euid;
1238 security_task_getsecid(current, &as->secid);
1239 if (!is_in && uurb->buffer_length > 0) {
1240 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1241 uurb->buffer_length)) {
1242 free_async(as);
1243 return -EFAULT;
1244 }
1245 }
1246 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1247 as->urb->transfer_buffer_length, 0, SUBMIT);
1248 async_newpending(as);
1249
1250 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1251 spin_lock_irq(&ps->lock);
1252
1253 /* Not exactly the endpoint address; the direction bit is
1254 * shifted to the 0x10 position so that the value will be
1255 * between 0 and 31.
1256 */
1257 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1258 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1259 >> 3);
1260
1261 /* If this bulk URB is the start of a new transfer, re-enable
1262 * the endpoint. Otherwise mark it as a continuation URB.
1263 */
1264 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1265 as->bulk_status = AS_CONTINUATION;
1266 else
1267 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1268
1269 /* Don't accept continuation URBs if the endpoint is
1270 * disabled because of an earlier error.
1271 */
1272 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1273 ret = -EREMOTEIO;
1274 else
1275 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1276 spin_unlock_irq(&ps->lock);
1277 } else {
1278 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1279 }
1280
1281 if (ret) {
1282 dev_printk(KERN_DEBUG, &ps->dev->dev,
1283 "usbfs: usb_submit_urb returned %d\n", ret);
1284 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1285 0, ret, COMPLETE);
1286 async_removepending(as);
1287 free_async(as);
1288 return ret;
1289 }
1290 return 0;
1291 }
1292
1293 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1294 {
1295 struct usbdevfs_urb uurb;
1296
1297 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1298 return -EFAULT;
1299
1300 return proc_do_submiturb(ps, &uurb,
1301 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1302 arg);
1303 }
1304
1305 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1306 {
1307 struct async *as;
1308
1309 as = async_getpending(ps, arg);
1310 if (!as)
1311 return -EINVAL;
1312 usb_kill_urb(as->urb);
1313 return 0;
1314 }
1315
1316 static int processcompl(struct async *as, void __user * __user *arg)
1317 {
1318 struct urb *urb = as->urb;
1319 struct usbdevfs_urb __user *userurb = as->userurb;
1320 void __user *addr = as->userurb;
1321 unsigned int i;
1322
1323 if (as->userbuffer && urb->actual_length)
1324 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1325 urb->actual_length))
1326 goto err_out;
1327 if (put_user(as->status, &userurb->status))
1328 goto err_out;
1329 if (put_user(urb->actual_length, &userurb->actual_length))
1330 goto err_out;
1331 if (put_user(urb->error_count, &userurb->error_count))
1332 goto err_out;
1333
1334 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1335 for (i = 0; i < urb->number_of_packets; i++) {
1336 if (put_user(urb->iso_frame_desc[i].actual_length,
1337 &userurb->iso_frame_desc[i].actual_length))
1338 goto err_out;
1339 if (put_user(urb->iso_frame_desc[i].status,
1340 &userurb->iso_frame_desc[i].status))
1341 goto err_out;
1342 }
1343 }
1344
1345 if (put_user(addr, (void __user * __user *)arg))
1346 return -EFAULT;
1347 return 0;
1348
1349 err_out:
1350 return -EFAULT;
1351 }
1352
1353 static struct async *reap_as(struct dev_state *ps)
1354 {
1355 DECLARE_WAITQUEUE(wait, current);
1356 struct async *as = NULL;
1357 struct usb_device *dev = ps->dev;
1358
1359 add_wait_queue(&ps->wait, &wait);
1360 for (;;) {
1361 __set_current_state(TASK_INTERRUPTIBLE);
1362 as = async_getcompleted(ps);
1363 if (as)
1364 break;
1365 if (signal_pending(current))
1366 break;
1367 usb_unlock_device(dev);
1368 schedule();
1369 usb_lock_device(dev);
1370 }
1371 remove_wait_queue(&ps->wait, &wait);
1372 set_current_state(TASK_RUNNING);
1373 return as;
1374 }
1375
1376 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1377 {
1378 struct async *as = reap_as(ps);
1379 if (as) {
1380 int retval = processcompl(as, (void __user * __user *)arg);
1381 free_async(as);
1382 return retval;
1383 }
1384 if (signal_pending(current))
1385 return -EINTR;
1386 return -EIO;
1387 }
1388
1389 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1390 {
1391 int retval;
1392 struct async *as;
1393
1394 as = async_getcompleted(ps);
1395 retval = -EAGAIN;
1396 if (as) {
1397 retval = processcompl(as, (void __user * __user *)arg);
1398 free_async(as);
1399 }
1400 return retval;
1401 }
1402
1403 #ifdef CONFIG_COMPAT
1404 static int proc_control_compat(struct dev_state *ps,
1405 struct usbdevfs_ctrltransfer32 __user *p32)
1406 {
1407 struct usbdevfs_ctrltransfer __user *p;
1408 __u32 udata;
1409 p = compat_alloc_user_space(sizeof(*p));
1410 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1411 get_user(udata, &p32->data) ||
1412 put_user(compat_ptr(udata), &p->data))
1413 return -EFAULT;
1414 return proc_control(ps, p);
1415 }
1416
1417 static int proc_bulk_compat(struct dev_state *ps,
1418 struct usbdevfs_bulktransfer32 __user *p32)
1419 {
1420 struct usbdevfs_bulktransfer __user *p;
1421 compat_uint_t n;
1422 compat_caddr_t addr;
1423
1424 p = compat_alloc_user_space(sizeof(*p));
1425
1426 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1427 get_user(n, &p32->len) || put_user(n, &p->len) ||
1428 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1429 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1430 return -EFAULT;
1431
1432 return proc_bulk(ps, p);
1433 }
1434 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1435 {
1436 struct usbdevfs_disconnectsignal32 ds;
1437
1438 if (copy_from_user(&ds, arg, sizeof(ds)))
1439 return -EFAULT;
1440 ps->discsignr = ds.signr;
1441 ps->disccontext = compat_ptr(ds.context);
1442 return 0;
1443 }
1444
1445 static int get_urb32(struct usbdevfs_urb *kurb,
1446 struct usbdevfs_urb32 __user *uurb)
1447 {
1448 __u32 uptr;
1449 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1450 __get_user(kurb->type, &uurb->type) ||
1451 __get_user(kurb->endpoint, &uurb->endpoint) ||
1452 __get_user(kurb->status, &uurb->status) ||
1453 __get_user(kurb->flags, &uurb->flags) ||
1454 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1455 __get_user(kurb->actual_length, &uurb->actual_length) ||
1456 __get_user(kurb->start_frame, &uurb->start_frame) ||
1457 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1458 __get_user(kurb->error_count, &uurb->error_count) ||
1459 __get_user(kurb->signr, &uurb->signr))
1460 return -EFAULT;
1461
1462 if (__get_user(uptr, &uurb->buffer))
1463 return -EFAULT;
1464 kurb->buffer = compat_ptr(uptr);
1465 if (__get_user(uptr, &uurb->usercontext))
1466 return -EFAULT;
1467 kurb->usercontext = compat_ptr(uptr);
1468
1469 return 0;
1470 }
1471
1472 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1473 {
1474 struct usbdevfs_urb uurb;
1475
1476 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1477 return -EFAULT;
1478
1479 return proc_do_submiturb(ps, &uurb,
1480 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1481 arg);
1482 }
1483
1484 static int processcompl_compat(struct async *as, void __user * __user *arg)
1485 {
1486 struct urb *urb = as->urb;
1487 struct usbdevfs_urb32 __user *userurb = as->userurb;
1488 void __user *addr = as->userurb;
1489 unsigned int i;
1490
1491 if (as->userbuffer && urb->actual_length)
1492 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1493 urb->actual_length))
1494 return -EFAULT;
1495 if (put_user(as->status, &userurb->status))
1496 return -EFAULT;
1497 if (put_user(urb->actual_length, &userurb->actual_length))
1498 return -EFAULT;
1499 if (put_user(urb->error_count, &userurb->error_count))
1500 return -EFAULT;
1501
1502 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1503 for (i = 0; i < urb->number_of_packets; i++) {
1504 if (put_user(urb->iso_frame_desc[i].actual_length,
1505 &userurb->iso_frame_desc[i].actual_length))
1506 return -EFAULT;
1507 if (put_user(urb->iso_frame_desc[i].status,
1508 &userurb->iso_frame_desc[i].status))
1509 return -EFAULT;
1510 }
1511 }
1512
1513 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1514 return -EFAULT;
1515 return 0;
1516 }
1517
1518 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1519 {
1520 struct async *as = reap_as(ps);
1521 if (as) {
1522 int retval = processcompl_compat(as, (void __user * __user *)arg);
1523 free_async(as);
1524 return retval;
1525 }
1526 if (signal_pending(current))
1527 return -EINTR;
1528 return -EIO;
1529 }
1530
1531 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1532 {
1533 int retval;
1534 struct async *as;
1535
1536 retval = -EAGAIN;
1537 as = async_getcompleted(ps);
1538 if (as) {
1539 retval = processcompl_compat(as, (void __user * __user *)arg);
1540 free_async(as);
1541 }
1542 return retval;
1543 }
1544
1545
1546 #endif
1547
1548 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1549 {
1550 struct usbdevfs_disconnectsignal ds;
1551
1552 if (copy_from_user(&ds, arg, sizeof(ds)))
1553 return -EFAULT;
1554 ps->discsignr = ds.signr;
1555 ps->disccontext = ds.context;
1556 return 0;
1557 }
1558
1559 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1560 {
1561 unsigned int ifnum;
1562
1563 if (get_user(ifnum, (unsigned int __user *)arg))
1564 return -EFAULT;
1565 return claimintf(ps, ifnum);
1566 }
1567
1568 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1569 {
1570 unsigned int ifnum;
1571 int ret;
1572
1573 if (get_user(ifnum, (unsigned int __user *)arg))
1574 return -EFAULT;
1575 if ((ret = releaseintf(ps, ifnum)) < 0)
1576 return ret;
1577 destroy_async_on_interface (ps, ifnum);
1578 return 0;
1579 }
1580
1581 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1582 {
1583 int size;
1584 void *buf = NULL;
1585 int retval = 0;
1586 struct usb_interface *intf = NULL;
1587 struct usb_driver *driver = NULL;
1588
1589 /* alloc buffer */
1590 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1591 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1592 return -ENOMEM;
1593 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1594 if (copy_from_user(buf, ctl->data, size)) {
1595 kfree(buf);
1596 return -EFAULT;
1597 }
1598 } else {
1599 memset(buf, 0, size);
1600 }
1601 }
1602
1603 if (!connected(ps)) {
1604 kfree(buf);
1605 return -ENODEV;
1606 }
1607
1608 if (ps->dev->state != USB_STATE_CONFIGURED)
1609 retval = -EHOSTUNREACH;
1610 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1611 retval = -EINVAL;
1612 else switch (ctl->ioctl_code) {
1613
1614 /* disconnect kernel driver from interface */
1615 case USBDEVFS_DISCONNECT:
1616 if (intf->dev.driver) {
1617 driver = to_usb_driver(intf->dev.driver);
1618 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1619 usb_driver_release_interface(driver, intf);
1620 } else
1621 retval = -ENODATA;
1622 break;
1623
1624 /* let kernel drivers try to (re)bind to the interface */
1625 case USBDEVFS_CONNECT:
1626 if (!intf->dev.driver)
1627 retval = device_attach(&intf->dev);
1628 else
1629 retval = -EBUSY;
1630 break;
1631
1632 /* talk directly to the interface's driver */
1633 default:
1634 if (intf->dev.driver)
1635 driver = to_usb_driver(intf->dev.driver);
1636 if (driver == NULL || driver->ioctl == NULL) {
1637 retval = -ENOTTY;
1638 } else {
1639 /* keep API that guarantees BKL */
1640 lock_kernel();
1641 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1642 unlock_kernel();
1643 if (retval == -ENOIOCTLCMD)
1644 retval = -ENOTTY;
1645 }
1646 }
1647
1648 /* cleanup and return */
1649 if (retval >= 0
1650 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1651 && size > 0
1652 && copy_to_user(ctl->data, buf, size) != 0)
1653 retval = -EFAULT;
1654
1655 kfree(buf);
1656 return retval;
1657 }
1658
1659 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1660 {
1661 struct usbdevfs_ioctl ctrl;
1662
1663 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1664 return -EFAULT;
1665 return proc_ioctl(ps, &ctrl);
1666 }
1667
1668 #ifdef CONFIG_COMPAT
1669 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1670 {
1671 struct usbdevfs_ioctl32 __user *uioc;
1672 struct usbdevfs_ioctl ctrl;
1673 u32 udata;
1674
1675 uioc = compat_ptr((long)arg);
1676 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1677 __get_user(ctrl.ifno, &uioc->ifno) ||
1678 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1679 __get_user(udata, &uioc->data))
1680 return -EFAULT;
1681 ctrl.data = compat_ptr(udata);
1682
1683 return proc_ioctl(ps, &ctrl);
1684 }
1685 #endif
1686
1687 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1688 {
1689 unsigned portnum;
1690 int rc;
1691
1692 if (get_user(portnum, (unsigned __user *) arg))
1693 return -EFAULT;
1694 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1695 if (rc == 0)
1696 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1697 portnum, task_pid_nr(current), current->comm);
1698 return rc;
1699 }
1700
1701 static int proc_release_port(struct dev_state *ps, void __user *arg)
1702 {
1703 unsigned portnum;
1704
1705 if (get_user(portnum, (unsigned __user *) arg))
1706 return -EFAULT;
1707 return usb_hub_release_port(ps->dev, portnum, ps);
1708 }
1709
1710 /*
1711 * NOTE: All requests here that have interface numbers as parameters
1712 * are assuming that somehow the configuration has been prevented from
1713 * changing. But there's no mechanism to ensure that...
1714 */
1715 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1716 void __user *p)
1717 {
1718 struct dev_state *ps = file->private_data;
1719 struct inode *inode = file->f_path.dentry->d_inode;
1720 struct usb_device *dev = ps->dev;
1721 int ret = -ENOTTY;
1722
1723 if (!(file->f_mode & FMODE_WRITE))
1724 return -EPERM;
1725
1726 usb_lock_device(dev);
1727 if (!connected(ps)) {
1728 usb_unlock_device(dev);
1729 return -ENODEV;
1730 }
1731
1732 switch (cmd) {
1733 case USBDEVFS_CONTROL:
1734 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1735 ret = proc_control(ps, p);
1736 if (ret >= 0)
1737 inode->i_mtime = CURRENT_TIME;
1738 break;
1739
1740 case USBDEVFS_BULK:
1741 snoop(&dev->dev, "%s: BULK\n", __func__);
1742 ret = proc_bulk(ps, p);
1743 if (ret >= 0)
1744 inode->i_mtime = CURRENT_TIME;
1745 break;
1746
1747 case USBDEVFS_RESETEP:
1748 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1749 ret = proc_resetep(ps, p);
1750 if (ret >= 0)
1751 inode->i_mtime = CURRENT_TIME;
1752 break;
1753
1754 case USBDEVFS_RESET:
1755 snoop(&dev->dev, "%s: RESET\n", __func__);
1756 ret = proc_resetdevice(ps);
1757 break;
1758
1759 case USBDEVFS_CLEAR_HALT:
1760 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1761 ret = proc_clearhalt(ps, p);
1762 if (ret >= 0)
1763 inode->i_mtime = CURRENT_TIME;
1764 break;
1765
1766 case USBDEVFS_GETDRIVER:
1767 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1768 ret = proc_getdriver(ps, p);
1769 break;
1770
1771 case USBDEVFS_CONNECTINFO:
1772 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1773 ret = proc_connectinfo(ps, p);
1774 break;
1775
1776 case USBDEVFS_SETINTERFACE:
1777 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1778 ret = proc_setintf(ps, p);
1779 break;
1780
1781 case USBDEVFS_SETCONFIGURATION:
1782 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1783 ret = proc_setconfig(ps, p);
1784 break;
1785
1786 case USBDEVFS_SUBMITURB:
1787 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1788 ret = proc_submiturb(ps, p);
1789 if (ret >= 0)
1790 inode->i_mtime = CURRENT_TIME;
1791 break;
1792
1793 #ifdef CONFIG_COMPAT
1794 case USBDEVFS_CONTROL32:
1795 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1796 ret = proc_control_compat(ps, p);
1797 if (ret >= 0)
1798 inode->i_mtime = CURRENT_TIME;
1799 break;
1800
1801 case USBDEVFS_BULK32:
1802 snoop(&dev->dev, "%s: BULK32\n", __func__);
1803 ret = proc_bulk_compat(ps, p);
1804 if (ret >= 0)
1805 inode->i_mtime = CURRENT_TIME;
1806 break;
1807
1808 case USBDEVFS_DISCSIGNAL32:
1809 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1810 ret = proc_disconnectsignal_compat(ps, p);
1811 break;
1812
1813 case USBDEVFS_SUBMITURB32:
1814 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1815 ret = proc_submiturb_compat(ps, p);
1816 if (ret >= 0)
1817 inode->i_mtime = CURRENT_TIME;
1818 break;
1819
1820 case USBDEVFS_REAPURB32:
1821 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1822 ret = proc_reapurb_compat(ps, p);
1823 break;
1824
1825 case USBDEVFS_REAPURBNDELAY32:
1826 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1827 ret = proc_reapurbnonblock_compat(ps, p);
1828 break;
1829
1830 case USBDEVFS_IOCTL32:
1831 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1832 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1833 break;
1834 #endif
1835
1836 case USBDEVFS_DISCARDURB:
1837 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1838 ret = proc_unlinkurb(ps, p);
1839 break;
1840
1841 case USBDEVFS_REAPURB:
1842 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1843 ret = proc_reapurb(ps, p);
1844 break;
1845
1846 case USBDEVFS_REAPURBNDELAY:
1847 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1848 ret = proc_reapurbnonblock(ps, p);
1849 break;
1850
1851 case USBDEVFS_DISCSIGNAL:
1852 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1853 ret = proc_disconnectsignal(ps, p);
1854 break;
1855
1856 case USBDEVFS_CLAIMINTERFACE:
1857 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1858 ret = proc_claiminterface(ps, p);
1859 break;
1860
1861 case USBDEVFS_RELEASEINTERFACE:
1862 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1863 ret = proc_releaseinterface(ps, p);
1864 break;
1865
1866 case USBDEVFS_IOCTL:
1867 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1868 ret = proc_ioctl_default(ps, p);
1869 break;
1870
1871 case USBDEVFS_CLAIM_PORT:
1872 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1873 ret = proc_claim_port(ps, p);
1874 break;
1875
1876 case USBDEVFS_RELEASE_PORT:
1877 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1878 ret = proc_release_port(ps, p);
1879 break;
1880 }
1881 usb_unlock_device(dev);
1882 if (ret >= 0)
1883 inode->i_atime = CURRENT_TIME;
1884 return ret;
1885 }
1886
1887 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1888 unsigned long arg)
1889 {
1890 int ret;
1891
1892 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1893
1894 return ret;
1895 }
1896
1897 #ifdef CONFIG_COMPAT
1898 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1899 unsigned long arg)
1900 {
1901 int ret;
1902
1903 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1904
1905 return ret;
1906 }
1907 #endif
1908
1909 /* No kernel lock - fine */
1910 static unsigned int usbdev_poll(struct file *file,
1911 struct poll_table_struct *wait)
1912 {
1913 struct dev_state *ps = file->private_data;
1914 unsigned int mask = 0;
1915
1916 poll_wait(file, &ps->wait, wait);
1917 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1918 mask |= POLLOUT | POLLWRNORM;
1919 if (!connected(ps))
1920 mask |= POLLERR | POLLHUP;
1921 return mask;
1922 }
1923
1924 const struct file_operations usbdev_file_operations = {
1925 .owner = THIS_MODULE,
1926 .llseek = usbdev_lseek,
1927 .read = usbdev_read,
1928 .poll = usbdev_poll,
1929 .unlocked_ioctl = usbdev_ioctl,
1930 #ifdef CONFIG_COMPAT
1931 .compat_ioctl = usbdev_compat_ioctl,
1932 #endif
1933 .open = usbdev_open,
1934 .release = usbdev_release,
1935 };
1936
1937 static void usbdev_remove(struct usb_device *udev)
1938 {
1939 struct dev_state *ps;
1940 struct siginfo sinfo;
1941
1942 while (!list_empty(&udev->filelist)) {
1943 ps = list_entry(udev->filelist.next, struct dev_state, list);
1944 destroy_all_async(ps);
1945 wake_up_all(&ps->wait);
1946 list_del_init(&ps->list);
1947 if (ps->discsignr) {
1948 sinfo.si_signo = ps->discsignr;
1949 sinfo.si_errno = EPIPE;
1950 sinfo.si_code = SI_ASYNCIO;
1951 sinfo.si_addr = ps->disccontext;
1952 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1953 ps->disc_pid, ps->disc_uid,
1954 ps->disc_euid, ps->secid);
1955 }
1956 }
1957 }
1958
1959 #ifdef CONFIG_USB_DEVICE_CLASS
1960 static struct class *usb_classdev_class;
1961
1962 static int usb_classdev_add(struct usb_device *dev)
1963 {
1964 struct device *cldev;
1965
1966 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1967 NULL, "usbdev%d.%d", dev->bus->busnum,
1968 dev->devnum);
1969 if (IS_ERR(cldev))
1970 return PTR_ERR(cldev);
1971 dev->usb_classdev = cldev;
1972 return 0;
1973 }
1974
1975 static void usb_classdev_remove(struct usb_device *dev)
1976 {
1977 if (dev->usb_classdev)
1978 device_unregister(dev->usb_classdev);
1979 }
1980
1981 #else
1982 #define usb_classdev_add(dev) 0
1983 #define usb_classdev_remove(dev) do {} while (0)
1984
1985 #endif
1986
1987 static int usbdev_notify(struct notifier_block *self,
1988 unsigned long action, void *dev)
1989 {
1990 switch (action) {
1991 case USB_DEVICE_ADD:
1992 if (usb_classdev_add(dev))
1993 return NOTIFY_BAD;
1994 break;
1995 case USB_DEVICE_REMOVE:
1996 usb_classdev_remove(dev);
1997 usbdev_remove(dev);
1998 break;
1999 }
2000 return NOTIFY_OK;
2001 }
2002
2003 static struct notifier_block usbdev_nb = {
2004 .notifier_call = usbdev_notify,
2005 };
2006
2007 static struct cdev usb_device_cdev;
2008
2009 int __init usb_devio_init(void)
2010 {
2011 int retval;
2012
2013 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2014 "usb_device");
2015 if (retval) {
2016 printk(KERN_ERR "Unable to register minors for usb_device\n");
2017 goto out;
2018 }
2019 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2020 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2021 if (retval) {
2022 printk(KERN_ERR "Unable to get usb_device major %d\n",
2023 USB_DEVICE_MAJOR);
2024 goto error_cdev;
2025 }
2026 #ifdef CONFIG_USB_DEVICE_CLASS
2027 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2028 if (IS_ERR(usb_classdev_class)) {
2029 printk(KERN_ERR "Unable to register usb_device class\n");
2030 retval = PTR_ERR(usb_classdev_class);
2031 cdev_del(&usb_device_cdev);
2032 usb_classdev_class = NULL;
2033 goto out;
2034 }
2035 /* devices of this class shadow the major:minor of their parent
2036 * device, so clear ->dev_kobj to prevent adding duplicate entries
2037 * to /sys/dev
2038 */
2039 usb_classdev_class->dev_kobj = NULL;
2040 #endif
2041 usb_register_notify(&usbdev_nb);
2042 out:
2043 return retval;
2044
2045 error_cdev:
2046 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2047 goto out;
2048 }
2049
2050 void usb_devio_cleanup(void)
2051 {
2052 usb_unregister_notify(&usbdev_nb);
2053 #ifdef CONFIG_USB_DEVICE_CLASS
2054 class_destroy(usb_classdev_class);
2055 #endif
2056 cdev_del(&usb_device_cdev);
2057 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2058 }
Linux 2.6 libata-dev (mirror)