drivers/usb/core/devio.c

   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         lock_kernel();
 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         unlock_kernel();
 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         lock_kernel();
 657         /* Protect against simultaneous removal or release */
 658         mutex_lock(&usbfs_mutex);
 659
 660         ret = -ENOMEM;
 661         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 662         if (!ps)
 663                 goto out;
 664
 665         ret = -ENODEV;
 666
 667         /* usbdev device-node */
 668         if (imajor(inode) == USB_DEVICE_MAJOR)
 669                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 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         if (!dev || dev->state == USB_STATE_NOTATTACHED)
 682                 goto out;
 683         ret = usb_autoresume_device(dev);
 684         if (ret)
 685                 goto out;
 686
 687         ret = 0;
 688         ps->dev = dev;
 689         ps->file = file;
 690         spin_lock_init(&ps->lock);
 691         INIT_LIST_HEAD(&ps->list);
 692         INIT_LIST_HEAD(&ps->async_pending);
 693         INIT_LIST_HEAD(&ps->async_completed);
 694         init_waitqueue_head(&ps->wait);
 695         ps->discsignr = 0;
 696         ps->disc_pid = get_pid(task_pid(current));
 697         ps->disc_uid = cred->uid;
 698         ps->disc_euid = cred->euid;
 699         ps->disccontext = NULL;
 700         ps->ifclaimed = 0;
 701         security_task_getsecid(current, &ps->secid);
 702         smp_wmb();
 703         list_add_tail(&ps->list, &dev->filelist);
 704         file->private_data = ps;
 705         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 706                         current->comm);
 707  out:
 708         if (ret) {
 709                 kfree(ps);
 710                 usb_put_dev(dev);
 711         }
 712         mutex_unlock(&usbfs_mutex);
 713         unlock_kernel();
 714         return ret;
 715 }
 716
 717 static int usbdev_release(struct inode *inode, struct file *file)
 718 {
 719         struct dev_state *ps = file->private_data;
 720         struct usb_device *dev = ps->dev;
 721         unsigned int ifnum;
 722         struct async *as;
 723
 724         usb_lock_device(dev);
 725         usb_hub_release_all_ports(dev, ps);
 726
 727         /* Protect against simultaneous open */
 728         mutex_lock(&usbfs_mutex);
 729         list_del_init(&ps->list);
 730         mutex_unlock(&usbfs_mutex);
 731
 732         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 733                         ifnum++) {
 734                 if (test_bit(ifnum, &ps->ifclaimed))
 735                         releaseintf(ps, ifnum);
 736         }
 737         destroy_all_async(ps);
 738         usb_autosuspend_device(dev);
 739         usb_unlock_device(dev);
 740         usb_put_dev(dev);
 741         put_pid(ps->disc_pid);
 742
 743         as = async_getcompleted(ps);
 744         while (as) {
 745                 free_async(as);
 746                 as = async_getcompleted(ps);
 747         }
 748         kfree(ps);
 749         return 0;
 750 }
 751
 752 static int proc_control(struct dev_state *ps, void __user *arg)
 753 {
 754         struct usb_device *dev = ps->dev;
 755         struct usbdevfs_ctrltransfer ctrl;
 756         unsigned int tmo;
 757         unsigned char *tbuf;
 758         unsigned wLength;
 759         int i, pipe, ret;
 760
 761         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 762                 return -EFAULT;
 763         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 764         if (ret)
 765                 return ret;
 766         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 767         if (wLength > PAGE_SIZE)
 768                 return -EINVAL;
 769         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 770         if (!tbuf)
 771                 return -ENOMEM;
 772         tmo = ctrl.timeout;
 773         if (ctrl.bRequestType & 0x80) {
 774                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 775                                                ctrl.wLength)) {
 776                         free_page((unsigned long)tbuf);
 777                         return -EINVAL;
 778                 }
 779                 pipe = usb_rcvctrlpipe(dev, 0);
 780                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 781
 782                 usb_unlock_device(dev);
 783                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 784                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 785                                     tbuf, ctrl.wLength, tmo);
 786                 usb_lock_device(dev);
 787                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 788
 789                 if ((i > 0) && ctrl.wLength) {
 790                         if (copy_to_user(ctrl.data, tbuf, i)) {
 791                                 free_page((unsigned long)tbuf);
 792                                 return -EFAULT;
 793                         }
 794                 }
 795         } else {
 796                 if (ctrl.wLength) {
 797                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 798                                 free_page((unsigned long)tbuf);
 799                                 return -EFAULT;
 800                         }
 801                 }
 802                 pipe = usb_sndctrlpipe(dev, 0);
 803                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 804
 805                 usb_unlock_device(dev);
 806                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 807                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 808                                     tbuf, ctrl.wLength, tmo);
 809                 usb_lock_device(dev);
 810                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 811         }
 812         free_page((unsigned long)tbuf);
 813         if (i < 0 && i != -EPIPE) {
 814                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 815                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 816                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 817                            ctrl.wLength, i);
 818         }
 819         return i;
 820 }
 821
 822 static int proc_bulk(struct dev_state *ps, void __user *arg)
 823 {
 824         struct usb_device *dev = ps->dev;
 825         struct usbdevfs_bulktransfer bulk;
 826         unsigned int tmo, len1, pipe;
 827         int len2;
 828         unsigned char *tbuf;
 829         int i, ret;
 830
 831         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 832                 return -EFAULT;
 833         ret = findintfep(ps->dev, bulk.ep);
 834         if (ret < 0)
 835                 return ret;
 836         ret = checkintf(ps, ret);
 837         if (ret)
 838                 return ret;
 839         if (bulk.ep & USB_DIR_IN)
 840                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 841         else
 842                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 843         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 844                 return -EINVAL;
 845         len1 = bulk.len;
 846         if (len1 > MAX_USBFS_BUFFER_SIZE)
 847                 return -EINVAL;
 848         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 849                 return -ENOMEM;
 850         tmo = bulk.timeout;
 851         if (bulk.ep & 0x80) {
 852                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 853                         kfree(tbuf);
 854                         return -EINVAL;
 855                 }
 856                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 857
 858                 usb_unlock_device(dev);
 859                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 860                 usb_lock_device(dev);
 861                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 862
 863                 if (!i && len2) {
 864                         if (copy_to_user(bulk.data, tbuf, len2)) {
 865                                 kfree(tbuf);
 866                                 return -EFAULT;
 867                         }
 868                 }
 869         } else {
 870                 if (len1) {
 871                         if (copy_from_user(tbuf, bulk.data, len1)) {
 872                                 kfree(tbuf);
 873                                 return -EFAULT;
 874                         }
 875                 }
 876                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 877
 878                 usb_unlock_device(dev);
 879                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 880                 usb_lock_device(dev);
 881                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 882         }
 883         kfree(tbuf);
 884         if (i < 0)
 885                 return i;
 886         return len2;
 887 }
 888
 889 static int proc_resetep(struct dev_state *ps, void __user *arg)
 890 {
 891         unsigned int ep;
 892         int ret;
 893
 894         if (get_user(ep, (unsigned int __user *)arg))
 895                 return -EFAULT;
 896         ret = findintfep(ps->dev, ep);
 897         if (ret < 0)
 898                 return ret;
 899         ret = checkintf(ps, ret);
 900         if (ret)
 901                 return ret;
 902         usb_reset_endpoint(ps->dev, ep);
 903         return 0;
 904 }
 905
 906 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 907 {
 908         unsigned int ep;
 909         int pipe;
 910         int ret;
 911
 912         if (get_user(ep, (unsigned int __user *)arg))
 913                 return -EFAULT;
 914         ret = findintfep(ps->dev, ep);
 915         if (ret < 0)
 916                 return ret;
 917         ret = checkintf(ps, ret);
 918         if (ret)
 919                 return ret;
 920         if (ep & USB_DIR_IN)
 921                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 922         else
 923                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 924
 925         return usb_clear_halt(ps->dev, pipe);
 926 }
 927
 928 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 929 {
 930         struct usbdevfs_getdriver gd;
 931         struct usb_interface *intf;
 932         int ret;
 933
 934         if (copy_from_user(&gd, arg, sizeof(gd)))
 935                 return -EFAULT;
 936         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 937         if (!intf || !intf->dev.driver)
 938                 ret = -ENODATA;
 939         else {
 940                 strncpy(gd.driver, intf->dev.driver->name,
 941                                 sizeof(gd.driver));
 942                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 943         }
 944         return ret;
 945 }
 946
 947 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 948 {
 949         struct usbdevfs_connectinfo ci;
 950
 951         ci.devnum = ps->dev->devnum;
 952         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 953         if (copy_to_user(arg, &ci, sizeof(ci)))
 954                 return -EFAULT;
 955         return 0;
 956 }
 957
 958 static int proc_resetdevice(struct dev_state *ps)
 959 {
 960         return usb_reset_device(ps->dev);
 961 }
 962
 963 static int proc_setintf(struct dev_state *ps, void __user *arg)
 964 {
 965         struct usbdevfs_setinterface setintf;
 966         int ret;
 967
 968         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 969                 return -EFAULT;
 970         if ((ret = checkintf(ps, setintf.interface)))
 971                 return ret;
 972         return usb_set_interface(ps->dev, setintf.interface,
 973                         setintf.altsetting);
 974 }
 975
 976 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 977 {
 978         int u;
 979         int status = 0;
 980         struct usb_host_config *actconfig;
 981
 982         if (get_user(u, (int __user *)arg))
 983                 return -EFAULT;
 984
 985         actconfig = ps->dev->actconfig;
 986
 987         /* Don't touch the device if any interfaces are claimed.
 988          * It could interfere with other drivers' operations, and if
 989          * an interface is claimed by usbfs it could easily deadlock.
 990          */
 991         if (actconfig) {
 992                 int i;
 993
 994                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 995                         if (usb_interface_claimed(actconfig->interface[i])) {
 996                                 dev_warn(&ps->dev->dev,
 997                                         "usbfs: interface %d claimed by %s "
 998                                         "while '%s' sets config #%d\n",
 999                                         actconfig->interface[i]
1000                                                 ->cur_altsetting
1001                                                 ->desc.bInterfaceNumber,
1002                                         actconfig->interface[i]
1003                                                 ->dev.driver->name,
1004                                         current->comm, u);
1005                                 status = -EBUSY;
1006                                 break;
1007                         }
1008                 }
1009         }
1010
1011         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1012          * so avoid usb_set_configuration()'s kick to sysfs
1013          */
1014         if (status == 0) {
1015                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1016                         status = usb_reset_configuration(ps->dev);
1017                 else
1018                         status = usb_set_configuration(ps->dev, u);
1019         }
1020
1021         return status;
1022 }
1023
1024 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1025                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1026                         void __user *arg)
1027 {
1028         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1029         struct usb_host_endpoint *ep;
1030         struct async *as;
1031         struct usb_ctrlrequest *dr = NULL;
1032         const struct cred *cred = current_cred();
1033         unsigned int u, totlen, isofrmlen;
1034         int ret, ifnum = -1;
1035         int is_in;
1036
1037         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1038                                 USBDEVFS_URB_SHORT_NOT_OK |
1039                                 USBDEVFS_URB_BULK_CONTINUATION |
1040                                 USBDEVFS_URB_NO_FSBR |
1041                                 USBDEVFS_URB_ZERO_PACKET |
1042                                 USBDEVFS_URB_NO_INTERRUPT))
1043                 return -EINVAL;
1044         if (uurb->buffer_length > 0 && !uurb->buffer)
1045                 return -EINVAL;
1046         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1047             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1048                 ifnum = findintfep(ps->dev, uurb->endpoint);
1049                 if (ifnum < 0)
1050                         return ifnum;
1051                 ret = checkintf(ps, ifnum);
1052                 if (ret)
1053                         return ret;
1054         }
1055         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1056                 is_in = 1;
1057                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1058         } else {
1059                 is_in = 0;
1060                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1061         }
1062         if (!ep)
1063                 return -ENOENT;
1064         switch(uurb->type) {
1065         case USBDEVFS_URB_TYPE_CONTROL:
1066                 if (!usb_endpoint_xfer_control(&ep->desc))
1067                         return -EINVAL;
1068                 /* min 8 byte setup packet,
1069                  * max 8 byte setup plus an arbitrary data stage */
1070                 if (uurb->buffer_length < 8 ||
1071                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1072                         return -EINVAL;
1073                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1074                 if (!dr)
1075                         return -ENOMEM;
1076                 if (copy_from_user(dr, uurb->buffer, 8)) {
1077                         kfree(dr);
1078                         return -EFAULT;
1079                 }
1080                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1081                         kfree(dr);
1082                         return -EINVAL;
1083                 }
1084                 ret = check_ctrlrecip(ps, dr->bRequestType,
1085                                       le16_to_cpup(&dr->wIndex));
1086                 if (ret) {
1087                         kfree(dr);
1088                         return ret;
1089                 }
1090                 uurb->number_of_packets = 0;
1091                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1092                 uurb->buffer += 8;
1093                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1094                         is_in = 1;
1095                         uurb->endpoint |= USB_DIR_IN;
1096                 } else {
1097                         is_in = 0;
1098                         uurb->endpoint &= ~USB_DIR_IN;
1099                 }
1100                 break;
1101
1102         case USBDEVFS_URB_TYPE_BULK:
1103                 switch (usb_endpoint_type(&ep->desc)) {
1104                 case USB_ENDPOINT_XFER_CONTROL:
1105                 case USB_ENDPOINT_XFER_ISOC:
1106                         return -EINVAL;
1107                 /* allow single-shot interrupt transfers, at bogus rates */
1108                 }
1109                 uurb->number_of_packets = 0;
1110                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1111                         return -EINVAL;
1112                 break;
1113
1114         case USBDEVFS_URB_TYPE_ISO:
1115                 /* arbitrary limit */
1116                 if (uurb->number_of_packets < 1 ||
1117                     uurb->number_of_packets > 128)
1118                         return -EINVAL;
1119                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1120                         return -EINVAL;
1121                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1122                                    uurb->number_of_packets;
1123                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1124                         return -ENOMEM;
1125                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1126                         kfree(isopkt);
1127                         return -EFAULT;
1128                 }
1129                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1130                         /* arbitrary limit,
1131                          * sufficient for USB 2.0 high-bandwidth iso */
1132                         if (isopkt[u].length > 8192) {
1133                                 kfree(isopkt);
1134                                 return -EINVAL;
1135                         }
1136                         totlen += isopkt[u].length;
1137                 }
1138                 /* 3072 * 64 microframes */
1139                 if (totlen > 196608) {
1140                         kfree(isopkt);
1141                         return -EINVAL;
1142                 }
1143                 uurb->buffer_length = totlen;
1144                 break;
1145
1146         case USBDEVFS_URB_TYPE_INTERRUPT:
1147                 uurb->number_of_packets = 0;
1148                 if (!usb_endpoint_xfer_int(&ep->desc))
1149                         return -EINVAL;
1150                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1151                         return -EINVAL;
1152                 break;
1153
1154         default:
1155                 return -EINVAL;
1156         }
1157         if (uurb->buffer_length > 0 &&
1158                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1159                                 uurb->buffer, uurb->buffer_length)) {
1160                 kfree(isopkt);
1161                 kfree(dr);
1162                 return -EFAULT;
1163         }
1164         as = alloc_async(uurb->number_of_packets);
1165         if (!as) {
1166                 kfree(isopkt);
1167                 kfree(dr);
1168                 return -ENOMEM;
1169         }
1170         if (uurb->buffer_length > 0) {
1171                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1172                                 GFP_KERNEL);
1173                 if (!as->urb->transfer_buffer) {
1174                         kfree(isopkt);
1175                         kfree(dr);
1176                         free_async(as);
1177                         return -ENOMEM;
1178                 }
1179                 /* Isochronous input data may end up being discontiguous
1180                  * if some of the packets are short.  Clear the buffer so
1181                  * that the gaps don't leak kernel data to userspace.
1182                  */
1183                 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1184                         memset(as->urb->transfer_buffer, 0,
1185                                         uurb->buffer_length);
1186         }
1187         as->urb->dev = ps->dev;
1188         as->urb->pipe = (uurb->type << 30) |
1189                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1190                         (uurb->endpoint & USB_DIR_IN);
1191
1192         /* This tedious sequence is necessary because the URB_* flags
1193          * are internal to the kernel and subject to change, whereas
1194          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1195          */
1196         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1197         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1198                 u |= URB_ISO_ASAP;
1199         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1200                 u |= URB_SHORT_NOT_OK;
1201         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1202                 u |= URB_NO_FSBR;
1203         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1204                 u |= URB_ZERO_PACKET;
1205         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1206                 u |= URB_NO_INTERRUPT;
1207         as->urb->transfer_flags = u;
1208
1209         as->urb->transfer_buffer_length = uurb->buffer_length;
1210         as->urb->setup_packet = (unsigned char *)dr;
1211         as->urb->start_frame = uurb->start_frame;
1212         as->urb->number_of_packets = uurb->number_of_packets;
1213         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1214                         ps->dev->speed == USB_SPEED_HIGH)
1215                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1216         else
1217                 as->urb->interval = ep->desc.bInterval;
1218         as->urb->context = as;
1219         as->urb->complete = async_completed;
1220         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1221                 as->urb->iso_frame_desc[u].offset = totlen;
1222                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1223                 totlen += isopkt[u].length;
1224         }
1225         kfree(isopkt);
1226         as->ps = ps;
1227         as->userurb = arg;
1228         if (is_in && uurb->buffer_length > 0)
1229                 as->userbuffer = uurb->buffer;
1230         else
1231                 as->userbuffer = NULL;
1232         as->signr = uurb->signr;
1233         as->ifnum = ifnum;
1234         as->pid = get_pid(task_pid(current));
1235         as->uid = cred->uid;
1236         as->euid = cred->euid;
1237         security_task_getsecid(current, &as->secid);
1238         if (!is_in && uurb->buffer_length > 0) {
1239                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1240                                 uurb->buffer_length)) {
1241                         free_async(as);
1242                         return -EFAULT;
1243                 }
1244         }
1245         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1246                         as->urb->transfer_buffer_length, 0, SUBMIT);
1247         async_newpending(as);
1248
1249         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1250                 spin_lock_irq(&ps->lock);
1251
1252                 /* Not exactly the endpoint address; the direction bit is
1253                  * shifted to the 0x10 position so that the value will be
1254                  * between 0 and 31.
1255                  */
1256                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1257                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1258                                 >> 3);
1259
1260                 /* If this bulk URB is the start of a new transfer, re-enable
1261                  * the endpoint.  Otherwise mark it as a continuation URB.
1262                  */
1263                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1264                         as->bulk_status = AS_CONTINUATION;
1265                 else
1266                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1267
1268                 /* Don't accept continuation URBs if the endpoint is
1269                  * disabled because of an earlier error.
1270                  */
1271                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1272                         ret = -EREMOTEIO;
1273                 else
1274                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1275                 spin_unlock_irq(&ps->lock);
1276         } else {
1277                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1278         }
1279
1280         if (ret) {
1281                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1282                            "usbfs: usb_submit_urb returned %d\n", ret);
1283                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1284                                 0, ret, COMPLETE);
1285                 async_removepending(as);
1286                 free_async(as);
1287                 return ret;
1288         }
1289         return 0;
1290 }
1291
1292 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1293 {
1294         struct usbdevfs_urb uurb;
1295
1296         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1297                 return -EFAULT;
1298
1299         return proc_do_submiturb(ps, &uurb,
1300                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1301                         arg);
1302 }
1303
1304 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1305 {
1306         struct async *as;
1307
1308         as = async_getpending(ps, arg);
1309         if (!as)
1310                 return -EINVAL;
1311         usb_kill_urb(as->urb);
1312         return 0;
1313 }
1314
1315 static int processcompl(struct async *as, void __user * __user *arg)
1316 {
1317         struct urb *urb = as->urb;
1318         struct usbdevfs_urb __user *userurb = as->userurb;
1319         void __user *addr = as->userurb;
1320         unsigned int i;
1321
1322         if (as->userbuffer && urb->actual_length) {
1323                 if (urb->number_of_packets > 0)         /* Isochronous */
1324                         i = urb->transfer_buffer_length;
1325                 else                                    /* Non-Isoc */
1326                         i = urb->actual_length;
1327                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1328                         goto err_out;
1329         }
1330         if (put_user(as->status, &userurb->status))
1331                 goto err_out;
1332         if (put_user(urb->actual_length, &userurb->actual_length))
1333                 goto err_out;
1334         if (put_user(urb->error_count, &userurb->error_count))
1335                 goto err_out;
1336
1337         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1338                 for (i = 0; i < urb->number_of_packets; i++) {
1339                         if (put_user(urb->iso_frame_desc[i].actual_length,
1340                                      &userurb->iso_frame_desc[i].actual_length))
1341                                 goto err_out;
1342                         if (put_user(urb->iso_frame_desc[i].status,
1343                                      &userurb->iso_frame_desc[i].status))
1344                                 goto err_out;
1345                 }
1346         }
1347
1348         if (put_user(addr, (void __user * __user *)arg))
1349                 return -EFAULT;
1350         return 0;
1351
1352 err_out:
1353         return -EFAULT;
1354 }
1355
1356 static struct async *reap_as(struct dev_state *ps)
1357 {
1358         DECLARE_WAITQUEUE(wait, current);
1359         struct async *as = NULL;
1360         struct usb_device *dev = ps->dev;
1361
1362         add_wait_queue(&ps->wait, &wait);
1363         for (;;) {
1364                 __set_current_state(TASK_INTERRUPTIBLE);
1365                 as = async_getcompleted(ps);
1366                 if (as)
1367                         break;
1368                 if (signal_pending(current))
1369                         break;
1370                 usb_unlock_device(dev);
1371                 schedule();
1372                 usb_lock_device(dev);
1373         }
1374         remove_wait_queue(&ps->wait, &wait);
1375         set_current_state(TASK_RUNNING);
1376         return as;
1377 }
1378
1379 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1380 {
1381         struct async *as = reap_as(ps);
1382         if (as) {
1383                 int retval = processcompl(as, (void __user * __user *)arg);
1384                 free_async(as);
1385                 return retval;
1386         }
1387         if (signal_pending(current))
1388                 return -EINTR;
1389         return -EIO;
1390 }
1391
1392 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1393 {
1394         int retval;
1395         struct async *as;
1396
1397         as = async_getcompleted(ps);
1398         retval = -EAGAIN;
1399         if (as) {
1400                 retval = processcompl(as, (void __user * __user *)arg);
1401                 free_async(as);
1402         }
1403         return retval;
1404 }
1405
1406 #ifdef CONFIG_COMPAT
1407
1408 static int get_urb32(struct usbdevfs_urb *kurb,
1409                      struct usbdevfs_urb32 __user *uurb)
1410 {
1411         __u32  uptr;
1412         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1413             __get_user(kurb->type, &uurb->type) ||
1414             __get_user(kurb->endpoint, &uurb->endpoint) ||
1415             __get_user(kurb->status, &uurb->status) ||
1416             __get_user(kurb->flags, &uurb->flags) ||
1417             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1418             __get_user(kurb->actual_length, &uurb->actual_length) ||
1419             __get_user(kurb->start_frame, &uurb->start_frame) ||
1420             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1421             __get_user(kurb->error_count, &uurb->error_count) ||
1422             __get_user(kurb->signr, &uurb->signr))
1423                 return -EFAULT;
1424
1425         if (__get_user(uptr, &uurb->buffer))
1426                 return -EFAULT;
1427         kurb->buffer = compat_ptr(uptr);
1428         if (__get_user(uptr, &uurb->usercontext))
1429                 return -EFAULT;
1430         kurb->usercontext = compat_ptr(uptr);
1431
1432         return 0;
1433 }
1434
1435 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1436 {
1437         struct usbdevfs_urb uurb;
1438
1439         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1440                 return -EFAULT;
1441
1442         return proc_do_submiturb(ps, &uurb,
1443                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1444                         arg);
1445 }
1446
1447 static int processcompl_compat(struct async *as, void __user * __user *arg)
1448 {
1449         struct urb *urb = as->urb;
1450         struct usbdevfs_urb32 __user *userurb = as->userurb;
1451         void __user *addr = as->userurb;
1452         unsigned int i;
1453
1454         if (as->userbuffer && urb->actual_length)
1455                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1456                                  urb->actual_length))
1457                         return -EFAULT;
1458         if (put_user(as->status, &userurb->status))
1459                 return -EFAULT;
1460         if (put_user(urb->actual_length, &userurb->actual_length))
1461                 return -EFAULT;
1462         if (put_user(urb->error_count, &userurb->error_count))
1463                 return -EFAULT;
1464
1465         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1466                 for (i = 0; i < urb->number_of_packets; i++) {
1467                         if (put_user(urb->iso_frame_desc[i].actual_length,
1468                                      &userurb->iso_frame_desc[i].actual_length))
1469                                 return -EFAULT;
1470                         if (put_user(urb->iso_frame_desc[i].status,
1471                                      &userurb->iso_frame_desc[i].status))
1472                                 return -EFAULT;
1473                 }
1474         }
1475
1476         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1477                 return -EFAULT;
1478         return 0;
1479 }
1480
1481 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1482 {
1483         struct async *as = reap_as(ps);
1484         if (as) {
1485                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1486                 free_async(as);
1487                 return retval;
1488         }
1489         if (signal_pending(current))
1490                 return -EINTR;
1491         return -EIO;
1492 }
1493
1494 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1495 {
1496         int retval;
1497         struct async *as;
1498
1499         retval = -EAGAIN;
1500         as = async_getcompleted(ps);
1501         if (as) {
1502                 retval = processcompl_compat(as, (void __user * __user *)arg);
1503                 free_async(as);
1504         }
1505         return retval;
1506 }
1507
1508 #endif
1509
1510 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1511 {
1512         struct usbdevfs_disconnectsignal ds;
1513
1514         if (copy_from_user(&ds, arg, sizeof(ds)))
1515                 return -EFAULT;
1516         ps->discsignr = ds.signr;
1517         ps->disccontext = ds.context;
1518         return 0;
1519 }
1520
1521 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1522 {
1523         unsigned int ifnum;
1524
1525         if (get_user(ifnum, (unsigned int __user *)arg))
1526                 return -EFAULT;
1527         return claimintf(ps, ifnum);
1528 }
1529
1530 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1531 {
1532         unsigned int ifnum;
1533         int ret;
1534
1535         if (get_user(ifnum, (unsigned int __user *)arg))
1536                 return -EFAULT;
1537         if ((ret = releaseintf(ps, ifnum)) < 0)
1538                 return ret;
1539         destroy_async_on_interface (ps, ifnum);
1540         return 0;
1541 }
1542
1543 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1544 {
1545         int                     size;
1546         void                    *buf = NULL;
1547         int                     retval = 0;
1548         struct usb_interface    *intf = NULL;
1549         struct usb_driver       *driver = NULL;
1550
1551         /* alloc buffer */
1552         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1553                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1554                         return -ENOMEM;
1555                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1556                         if (copy_from_user(buf, ctl->data, size)) {
1557                                 kfree(buf);
1558                                 return -EFAULT;
1559                         }
1560                 } else {
1561                         memset(buf, 0, size);
1562                 }
1563         }
1564
1565         if (!connected(ps)) {
1566                 kfree(buf);
1567                 return -ENODEV;
1568         }
1569
1570         if (ps->dev->state != USB_STATE_CONFIGURED)
1571                 retval = -EHOSTUNREACH;
1572         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1573                 retval = -EINVAL;
1574         else switch (ctl->ioctl_code) {
1575
1576         /* disconnect kernel driver from interface */
1577         case USBDEVFS_DISCONNECT:
1578                 if (intf->dev.driver) {
1579                         driver = to_usb_driver(intf->dev.driver);
1580                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1581                         usb_driver_release_interface(driver, intf);
1582                 } else
1583                         retval = -ENODATA;
1584                 break;
1585
1586         /* let kernel drivers try to (re)bind to the interface */
1587         case USBDEVFS_CONNECT:
1588                 if (!intf->dev.driver)
1589                         retval = device_attach(&intf->dev);
1590                 else
1591                         retval = -EBUSY;
1592                 break;
1593
1594         /* talk directly to the interface's driver */
1595         default:
1596                 if (intf->dev.driver)
1597                         driver = to_usb_driver(intf->dev.driver);
1598                 if (driver == NULL || driver->ioctl == NULL) {
1599                         retval = -ENOTTY;
1600                 } else {
1601                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1602                         if (retval == -ENOIOCTLCMD)
1603                                 retval = -ENOTTY;
1604                 }
1605         }
1606
1607         /* cleanup and return */
1608         if (retval >= 0
1609                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1610                         && size > 0
1611                         && copy_to_user(ctl->data, buf, size) != 0)
1612                 retval = -EFAULT;
1613
1614         kfree(buf);
1615         return retval;
1616 }
1617
1618 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1619 {
1620         struct usbdevfs_ioctl   ctrl;
1621
1622         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1623                 return -EFAULT;
1624         return proc_ioctl(ps, &ctrl);
1625 }
1626
1627 #ifdef CONFIG_COMPAT
1628 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1629 {
1630         struct usbdevfs_ioctl32 __user *uioc;
1631         struct usbdevfs_ioctl ctrl;
1632         u32 udata;
1633
1634         uioc = compat_ptr((long)arg);
1635         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1636             __get_user(ctrl.ifno, &uioc->ifno) ||
1637             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1638             __get_user(udata, &uioc->data))
1639                 return -EFAULT;
1640         ctrl.data = compat_ptr(udata);
1641
1642         return proc_ioctl(ps, &ctrl);
1643 }
1644 #endif
1645
1646 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1647 {
1648         unsigned portnum;
1649         int rc;
1650
1651         if (get_user(portnum, (unsigned __user *) arg))
1652                 return -EFAULT;
1653         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1654         if (rc == 0)
1655                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1656                         portnum, task_pid_nr(current), current->comm);
1657         return rc;
1658 }
1659
1660 static int proc_release_port(struct dev_state *ps, void __user *arg)
1661 {
1662         unsigned portnum;
1663
1664         if (get_user(portnum, (unsigned __user *) arg))
1665                 return -EFAULT;
1666         return usb_hub_release_port(ps->dev, portnum, ps);
1667 }
1668
1669 /*
1670  * NOTE:  All requests here that have interface numbers as parameters
1671  * are assuming that somehow the configuration has been prevented from
1672  * changing.  But there's no mechanism to ensure that...
1673  */
1674 static int usbdev_ioctl(struct inode *inode, struct file *file,
1675                         unsigned int cmd, unsigned long arg)
1676 {
1677         struct dev_state *ps = file->private_data;
1678         struct usb_device *dev = ps->dev;
1679         void __user *p = (void __user *)arg;
1680         int ret = -ENOTTY;
1681
1682         if (!(file->f_mode & FMODE_WRITE))
1683                 return -EPERM;
1684         usb_lock_device(dev);
1685         if (!connected(ps)) {
1686                 usb_unlock_device(dev);
1687                 return -ENODEV;
1688         }
1689
1690         switch (cmd) {
1691         case USBDEVFS_CONTROL:
1692                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1693                 ret = proc_control(ps, p);
1694                 if (ret >= 0)
1695                         inode->i_mtime = CURRENT_TIME;
1696                 break;
1697
1698         case USBDEVFS_BULK:
1699                 snoop(&dev->dev, "%s: BULK\n", __func__);
1700                 ret = proc_bulk(ps, p);
1701                 if (ret >= 0)
1702                         inode->i_mtime = CURRENT_TIME;
1703                 break;
1704
1705         case USBDEVFS_RESETEP:
1706                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1707                 ret = proc_resetep(ps, p);
1708                 if (ret >= 0)
1709                         inode->i_mtime = CURRENT_TIME;
1710                 break;
1711
1712         case USBDEVFS_RESET:
1713                 snoop(&dev->dev, "%s: RESET\n", __func__);
1714                 ret = proc_resetdevice(ps);
1715                 break;
1716
1717         case USBDEVFS_CLEAR_HALT:
1718                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1719                 ret = proc_clearhalt(ps, p);
1720                 if (ret >= 0)
1721                         inode->i_mtime = CURRENT_TIME;
1722                 break;
1723
1724         case USBDEVFS_GETDRIVER:
1725                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1726                 ret = proc_getdriver(ps, p);
1727                 break;
1728
1729         case USBDEVFS_CONNECTINFO:
1730                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1731                 ret = proc_connectinfo(ps, p);
1732                 break;
1733
1734         case USBDEVFS_SETINTERFACE:
1735                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1736                 ret = proc_setintf(ps, p);
1737                 break;
1738
1739         case USBDEVFS_SETCONFIGURATION:
1740                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1741                 ret = proc_setconfig(ps, p);
1742                 break;
1743
1744         case USBDEVFS_SUBMITURB:
1745                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1746                 ret = proc_submiturb(ps, p);
1747                 if (ret >= 0)
1748                         inode->i_mtime = CURRENT_TIME;
1749                 break;
1750
1751 #ifdef CONFIG_COMPAT
1752
1753         case USBDEVFS_SUBMITURB32:
1754                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1755                 ret = proc_submiturb_compat(ps, p);
1756                 if (ret >= 0)
1757                         inode->i_mtime = CURRENT_TIME;
1758                 break;
1759
1760         case USBDEVFS_REAPURB32:
1761                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1762                 ret = proc_reapurb_compat(ps, p);
1763                 break;
1764
1765         case USBDEVFS_REAPURBNDELAY32:
1766                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1767                 ret = proc_reapurbnonblock_compat(ps, p);
1768                 break;
1769
1770         case USBDEVFS_IOCTL32:
1771                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1772                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1773                 break;
1774 #endif
1775
1776         case USBDEVFS_DISCARDURB:
1777                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1778                 ret = proc_unlinkurb(ps, p);
1779                 break;
1780
1781         case USBDEVFS_REAPURB:
1782                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1783                 ret = proc_reapurb(ps, p);
1784                 break;
1785
1786         case USBDEVFS_REAPURBNDELAY:
1787                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1788                 ret = proc_reapurbnonblock(ps, p);
1789                 break;
1790
1791         case USBDEVFS_DISCSIGNAL:
1792                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1793                 ret = proc_disconnectsignal(ps, p);
1794                 break;
1795
1796         case USBDEVFS_CLAIMINTERFACE:
1797                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1798                 ret = proc_claiminterface(ps, p);
1799                 break;
1800
1801         case USBDEVFS_RELEASEINTERFACE:
1802                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1803                 ret = proc_releaseinterface(ps, p);
1804                 break;
1805
1806         case USBDEVFS_IOCTL:
1807                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1808                 ret = proc_ioctl_default(ps, p);
1809                 break;
1810
1811         case USBDEVFS_CLAIM_PORT:
1812                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1813                 ret = proc_claim_port(ps, p);
1814                 break;
1815
1816         case USBDEVFS_RELEASE_PORT:
1817                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1818                 ret = proc_release_port(ps, p);
1819                 break;
1820         }
1821         usb_unlock_device(dev);
1822         if (ret >= 0)
1823                 inode->i_atime = CURRENT_TIME;
1824         return ret;
1825 }
1826
1827 /* No kernel lock - fine */
1828 static unsigned int usbdev_poll(struct file *file,
1829                                 struct poll_table_struct *wait)
1830 {
1831         struct dev_state *ps = file->private_data;
1832         unsigned int mask = 0;
1833
1834         poll_wait(file, &ps->wait, wait);
1835         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1836                 mask |= POLLOUT | POLLWRNORM;
1837         if (!connected(ps))
1838                 mask |= POLLERR | POLLHUP;
1839         return mask;
1840 }
1841
1842 const struct file_operations usbdev_file_operations = {
1843         .owner =        THIS_MODULE,
1844         .llseek =       usbdev_lseek,
1845         .read =         usbdev_read,
1846         .poll =         usbdev_poll,
1847         .ioctl =        usbdev_ioctl,
1848         .open =         usbdev_open,
1849         .release =      usbdev_release,
1850 };
1851
1852 static void usbdev_remove(struct usb_device *udev)
1853 {
1854         struct dev_state *ps;
1855         struct siginfo sinfo;
1856
1857         while (!list_empty(&udev->filelist)) {
1858                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1859                 destroy_all_async(ps);
1860                 wake_up_all(&ps->wait);
1861                 list_del_init(&ps->list);
1862                 if (ps->discsignr) {
1863                         sinfo.si_signo = ps->discsignr;
1864                         sinfo.si_errno = EPIPE;
1865                         sinfo.si_code = SI_ASYNCIO;
1866                         sinfo.si_addr = ps->disccontext;
1867                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1868                                         ps->disc_pid, ps->disc_uid,
1869                                         ps->disc_euid, ps->secid);
1870                 }
1871         }
1872 }
1873
1874 #ifdef CONFIG_USB_DEVICE_CLASS
1875 static struct class *usb_classdev_class;
1876
1877 static int usb_classdev_add(struct usb_device *dev)
1878 {
1879         struct device *cldev;
1880
1881         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1882                               NULL, "usbdev%d.%d", dev->bus->busnum,
1883                               dev->devnum);
1884         if (IS_ERR(cldev))
1885                 return PTR_ERR(cldev);
1886         dev->usb_classdev = cldev;
1887         return 0;
1888 }
1889
1890 static void usb_classdev_remove(struct usb_device *dev)
1891 {
1892         if (dev->usb_classdev)
1893                 device_unregister(dev->usb_classdev);
1894 }
1895
1896 #else
1897 #define usb_classdev_add(dev)           0
1898 #define usb_classdev_remove(dev)        do {} while (0)
1899
1900 #endif
1901
1902 static int usbdev_notify(struct notifier_block *self,
1903                                unsigned long action, void *dev)
1904 {
1905         switch (action) {
1906         case USB_DEVICE_ADD:
1907                 if (usb_classdev_add(dev))
1908                         return NOTIFY_BAD;
1909                 break;
1910         case USB_DEVICE_REMOVE:
1911                 usb_classdev_remove(dev);
1912                 usbdev_remove(dev);
1913                 break;
1914         }
1915         return NOTIFY_OK;
1916 }
1917
1918 static struct notifier_block usbdev_nb = {
1919         .notifier_call =        usbdev_notify,
1920 };
1921
1922 static struct cdev usb_device_cdev;
1923
1924 int __init usb_devio_init(void)
1925 {
1926         int retval;
1927
1928         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1929                                         "usb_device");
1930         if (retval) {
1931                 printk(KERN_ERR "Unable to register minors for usb_device\n");
1932                 goto out;
1933         }
1934         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1935         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1936         if (retval) {
1937                 printk(KERN_ERR "Unable to get usb_device major %d\n",
1938                        USB_DEVICE_MAJOR);
1939                 goto error_cdev;
1940         }
1941 #ifdef CONFIG_USB_DEVICE_CLASS
1942         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1943         if (IS_ERR(usb_classdev_class)) {
1944                 printk(KERN_ERR "Unable to register usb_device class\n");
1945                 retval = PTR_ERR(usb_classdev_class);
1946                 cdev_del(&usb_device_cdev);
1947                 usb_classdev_class = NULL;
1948                 goto out;
1949         }
1950         /* devices of this class shadow the major:minor of their parent
1951          * device, so clear ->dev_kobj to prevent adding duplicate entries
1952          * to /sys/dev
1953          */
1954         usb_classdev_class->dev_kobj = NULL;
1955 #endif
1956         usb_register_notify(&usbdev_nb);
1957 out:
1958         return retval;
1959
1960 error_cdev:
1961         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1962         goto out;
1963 }
1964
1965 void usb_devio_cleanup(void)
1966 {
1967         usb_unregister_notify(&usbdev_nb);
1968 #ifdef CONFIG_USB_DEVICE_CLASS
1969         class_destroy(usb_classdev_class);
1970 #endif
1971         cdev_del(&usb_device_cdev);
1972         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1973 }