drivers/net/irda/sir_dev.c

   1 /*********************************************************************
   2  *
   3  *      sir_dev.c:      irda sir network device
   4  *
   5  *      Copyright (c) 2002 Martin Diehl
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License as
   9  *      published by the Free Software Foundation; either version 2 of
  10  *      the License, or (at your option) any later version.
  11  *
  12  ********************************************************************/
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/smp_lock.h>
  18
  19 #include <net/irda/irda.h>
  20 #include <net/irda/wrapper.h>
  21 #include <net/irda/irda_device.h>
  22
  23 #include "sir-dev.h"
  24
  25 /***************************************************************************/
  26
  27 void sirdev_enable_rx(struct sir_dev *dev)
  28 {
  29         if (unlikely(atomic_read(&dev->enable_rx)))
  30                 return;
  31
  32         /* flush rx-buffer - should also help in case of problems with echo cancelation */
  33         dev->rx_buff.data = dev->rx_buff.head;
  34         dev->rx_buff.len = 0;
  35         dev->rx_buff.in_frame = FALSE;
  36         dev->rx_buff.state = OUTSIDE_FRAME;
  37         atomic_set(&dev->enable_rx, 1);
  38 }
  39
  40 static int sirdev_is_receiving(struct sir_dev *dev)
  41 {
  42         if (!atomic_read(&dev->enable_rx))
  43                 return 0;
  44
  45         return (dev->rx_buff.state != OUTSIDE_FRAME);
  46 }
  47
  48 int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
  49 {
  50         int err;
  51
  52         IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, type);
  53
  54         err = sirdev_schedule_dongle_open(dev, type);
  55         if (unlikely(err))
  56                 return err;
  57         down(&dev->fsm.sem);            /* block until config change completed */
  58         err = dev->fsm.result;
  59         up(&dev->fsm.sem);
  60         return err;
  61 }
  62
  63 /* used by dongle drivers for dongle programming */
  64
  65 int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
  66 {
  67         unsigned long flags;
  68         int ret;
  69
  70         if (unlikely(len > dev->tx_buff.truesize))
  71                 return -ENOSPC;
  72
  73         spin_lock_irqsave(&dev->tx_lock, flags);        /* serialize with other tx operations */
  74         while (dev->tx_buff.len > 0) {                  /* wait until tx idle */
  75                 spin_unlock_irqrestore(&dev->tx_lock, flags);
  76                 set_current_state(TASK_UNINTERRUPTIBLE);
  77                 schedule_timeout(msecs_to_jiffies(10));
  78                 spin_lock_irqsave(&dev->tx_lock, flags);
  79         }
  80
  81         dev->tx_buff.data = dev->tx_buff.head;
  82         memcpy(dev->tx_buff.data, buf, len);
  83         dev->tx_buff.len = len;
  84
  85         ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
  86         if (ret > 0) {
  87                 IRDA_DEBUG(3, "%s(), raw-tx started\n", __FUNCTION__);
  88
  89                 dev->tx_buff.data += ret;
  90                 dev->tx_buff.len -= ret;
  91                 dev->raw_tx = 1;
  92                 ret = len;              /* all data is going to be sent */
  93         }
  94         spin_unlock_irqrestore(&dev->tx_lock, flags);
  95         return ret;
  96 }
  97
  98 /* seems some dongle drivers may need this */
  99
 100 int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
 101 {
 102         int count;
 103
 104         if (atomic_read(&dev->enable_rx))
 105                 return -EIO;            /* fail if we expect irda-frames */
 106
 107         count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
 108
 109         if (count > 0) {
 110                 memcpy(buf, dev->rx_buff.data, count);
 111                 dev->rx_buff.data += count;
 112                 dev->rx_buff.len -= count;
 113         }
 114
 115         /* remaining stuff gets flushed when re-enabling normal rx */
 116
 117         return count;
 118 }
 119
 120 int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
 121 {
 122         int ret = -ENXIO;
 123         if (dev->drv->set_dtr_rts != 0)
 124                 ret =  dev->drv->set_dtr_rts(dev, dtr, rts);
 125         return ret;
 126 }
 127
 128 /**********************************************************************/
 129
 130 /* called from client driver - likely with bh-context - to indicate
 131  * it made some progress with transmission. Hence we send the next
 132  * chunk, if any, or complete the skb otherwise
 133  */
 134
 135 void sirdev_write_complete(struct sir_dev *dev)
 136 {
 137         unsigned long flags;
 138         struct sk_buff *skb;
 139         int actual = 0;
 140         int err;
 141
 142         spin_lock_irqsave(&dev->tx_lock, flags);
 143
 144         IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
 145                    __FUNCTION__, dev->tx_buff.len);
 146
 147         if (likely(dev->tx_buff.len > 0))  {
 148                 /* Write data left in transmit buffer */
 149                 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
 150
 151                 if (likely(actual>0)) {
 152                         dev->tx_buff.data += actual;
 153                         dev->tx_buff.len  -= actual;
 154                 }
 155                 else if (unlikely(actual<0)) {
 156                         /* could be dropped later when we have tx_timeout to recover */
 157                         ERROR("%s: drv->do_write failed (%d)\n", __FUNCTION__, actual);
 158                         if ((skb=dev->tx_skb) != NULL) {
 159                                 dev->tx_skb = NULL;
 160                                 dev_kfree_skb_any(skb);
 161                                 dev->stats.tx_errors++;
 162                                 dev->stats.tx_dropped++;
 163                         }
 164                         dev->tx_buff.len = 0;
 165                 }
 166                 if (dev->tx_buff.len > 0)
 167                         goto done;      /* more data to send later */
 168         }
 169
 170         if (unlikely(dev->raw_tx != 0)) {
 171                 /* in raw mode we are just done now after the buffer was sent
 172                  * completely. Since this was requested by some dongle driver
 173                  * running under the control of the irda-thread we must take
 174                  * care here not to re-enable the queue. The queue will be
 175                  * restarted when the irda-thread has completed the request.
 176                  */
 177
 178                 IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
 179                 dev->raw_tx = 0;
 180                 goto done;      /* no post-frame handling in raw mode */
 181         }
 182
 183         /* we have finished now sending this skb.
 184          * update statistics and free the skb.
 185          * finally we check and trigger a pending speed change, if any.
 186          * if not we switch to rx mode and wake the queue for further
 187          * packets.
 188          * note the scheduled speed request blocks until the lower
 189          * client driver and the corresponding hardware has really
 190          * finished sending all data (xmit fifo drained f.e.)
 191          * before the speed change gets finally done and the queue
 192          * re-activated.
 193          */
 194
 195         IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
 196
 197         if ((skb=dev->tx_skb) != NULL) {
 198                 dev->tx_skb = NULL;
 199                 dev->stats.tx_packets++;
 200                 dev->stats.tx_bytes += skb->len;
 201                 dev_kfree_skb_any(skb);
 202         }
 203
 204         if (unlikely(dev->new_speed > 0)) {
 205                 IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
 206                 err = sirdev_schedule_speed(dev, dev->new_speed);
 207                 if (unlikely(err)) {
 208                         /* should never happen
 209                          * forget the speed change and hope the stack recovers
 210                          */
 211                         ERROR("%s - schedule speed change failed: %d\n", __FUNCTION__, err);
 212                         netif_wake_queue(dev->netdev);
 213                 }
 214                 /* else: success
 215                  *      speed change in progress now
 216                  *      on completion dev->new_speed gets cleared,
 217                  *      rx-reenabled and the queue restarted
 218                  */
 219         }
 220         else {
 221                 sirdev_enable_rx(dev);
 222                 netif_wake_queue(dev->netdev);
 223         }
 224
 225 done:
 226         spin_unlock_irqrestore(&dev->tx_lock, flags);
 227 }
 228
 229 /* called from client driver - likely with bh-context - to give us
 230  * some more received bytes. We put them into the rx-buffer,
 231  * normally unwrapping and building LAP-skb's (unless rx disabled)
 232  */
 233
 234 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
 235 {
 236         if (!dev || !dev->netdev) {
 237                 WARNING("%s(), not ready yet!\n", __FUNCTION__);
 238                 return -1;
 239         }
 240
 241         if (!dev->irlap) {
 242                 WARNING("%s - too early: %p / %zd!\n",
 243                         __FUNCTION__, cp, count);
 244                 return -1;
 245         }
 246
 247         if (cp==NULL) {
 248                 /* error already at lower level receive
 249                  * just update stats and set media busy
 250                  */
 251                 irda_device_set_media_busy(dev->netdev, TRUE);
 252                 dev->stats.rx_dropped++;
 253                 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count);
 254                 return 0;
 255         }
 256
 257         /* Read the characters into the buffer */
 258         if (likely(atomic_read(&dev->enable_rx))) {
 259                 while (count--)
 260                         /* Unwrap and destuff one byte */
 261                         async_unwrap_char(dev->netdev, &dev->stats,
 262                                           &dev->rx_buff, *cp++);
 263         } else {
 264                 while (count--) {
 265                         /* rx not enabled: save the raw bytes and never
 266                          * trigger any netif_rx. The received bytes are flushed
 267                          * later when we re-enable rx but might be read meanwhile
 268                          * by the dongle driver.
 269                          */
 270                         dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
 271
 272                         /* What should we do when the buffer is full? */
 273                         if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
 274                                 dev->rx_buff.len = 0;
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 /**********************************************************************/
 282
 283 /* callbacks from network layer */
 284
 285 static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
 286 {
 287         struct sir_dev *dev = ndev->priv;
 288
 289         return (dev) ? &dev->stats : NULL;
 290 }
 291
 292 static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
 293 {
 294         struct sir_dev *dev = ndev->priv;
 295         unsigned long flags;
 296         int actual = 0;
 297         int err;
 298         s32 speed;
 299
 300         ASSERT(dev != NULL, return 0;);
 301
 302         netif_stop_queue(ndev);
 303
 304         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len);
 305
 306         speed = irda_get_next_speed(skb);
 307         if ((speed != dev->speed) && (speed != -1)) {
 308                 if (!skb->len) {
 309                         err = sirdev_schedule_speed(dev, speed);
 310                         if (unlikely(err == -EWOULDBLOCK)) {
 311                                 /* Failed to initiate the speed change, likely the fsm
 312                                  * is still busy (pretty unlikely, but...)
 313                                  * We refuse to accept the skb and return with the queue
 314                                  * stopped so the network layer will retry after the
 315                                  * fsm completes and wakes the queue.
 316                                  */
 317                                  return 1;
 318                         }
 319                         else if (unlikely(err)) {
 320                                 /* other fatal error - forget the speed change and
 321                                  * hope the stack will recover somehow
 322                                  */
 323                                  netif_start_queue(ndev);
 324                         }
 325                         /* else: success
 326                          *      speed change in progress now
 327                          *      on completion the queue gets restarted
 328                          */
 329
 330                         dev_kfree_skb_any(skb);
 331                         return 0;
 332                 } else
 333                         dev->new_speed = speed;
 334         }
 335
 336         /* Init tx buffer*/
 337         dev->tx_buff.data = dev->tx_buff.head;
 338
 339         /* Check problems */
 340         if(spin_is_locked(&dev->tx_lock)) {
 341                 IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
 342         }
 343
 344         /* serialize with write completion */
 345         spin_lock_irqsave(&dev->tx_lock, flags);
 346
 347         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
 348         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
 349
 350         /* transmission will start now - disable receive.
 351          * if we are just in the middle of an incoming frame,
 352          * treat it as collision. probably it's a good idea to
 353          * reset the rx_buf OUTSIDE_FRAME in this case too?
 354          */
 355         atomic_set(&dev->enable_rx, 0);
 356         if (unlikely(sirdev_is_receiving(dev)))
 357                 dev->stats.collisions++;
 358
 359         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
 360
 361         if (likely(actual > 0)) {
 362                 dev->tx_skb = skb;
 363                 ndev->trans_start = jiffies;
 364                 dev->tx_buff.data += actual;
 365                 dev->tx_buff.len -= actual;
 366         }
 367         else if (unlikely(actual < 0)) {
 368                 /* could be dropped later when we have tx_timeout to recover */
 369                 ERROR("%s: drv->do_write failed (%d)\n", __FUNCTION__, actual);
 370                 dev_kfree_skb_any(skb);
 371                 dev->stats.tx_errors++;
 372                 dev->stats.tx_dropped++;
 373                 netif_wake_queue(ndev);
 374         }
 375         spin_unlock_irqrestore(&dev->tx_lock, flags);
 376
 377         return 0;
 378 }
 379
 380 /* called from network layer with rtnl hold */
 381
 382 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
 383 {
 384         struct if_irda_req *irq = (struct if_irda_req *) rq;
 385         struct sir_dev *dev = ndev->priv;
 386         int ret = 0;
 387
 388         ASSERT(dev != NULL, return -1;);
 389
 390         IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd);
 391
 392         switch (cmd) {
 393         case SIOCSBANDWIDTH: /* Set bandwidth */
 394                 if (!capable(CAP_NET_ADMIN))
 395                         ret = -EPERM;
 396                 else
 397                         ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
 398                 /* cannot sleep here for completion
 399                  * we are called from network layer with rtnl hold
 400                  */
 401                 break;
 402
 403         case SIOCSDONGLE: /* Set dongle */
 404                 if (!capable(CAP_NET_ADMIN))
 405                         ret = -EPERM;
 406                 else
 407                         ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
 408                 /* cannot sleep here for completion
 409                  * we are called from network layer with rtnl hold
 410                  */
 411                 break;
 412
 413         case SIOCSMEDIABUSY: /* Set media busy */
 414                 if (!capable(CAP_NET_ADMIN))
 415                         ret = -EPERM;
 416                 else
 417                         irda_device_set_media_busy(dev->netdev, TRUE);
 418                 break;
 419
 420         case SIOCGRECEIVING: /* Check if we are receiving right now */
 421                 irq->ifr_receiving = sirdev_is_receiving(dev);
 422                 break;
 423
 424         case SIOCSDTRRTS:
 425                 if (!capable(CAP_NET_ADMIN))
 426                         ret = -EPERM;
 427                 else
 428                         ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
 429                 /* cannot sleep here for completion
 430                  * we are called from network layer with rtnl hold
 431                  */
 432                 break;
 433
 434         case SIOCSMODE:
 435 #if 0
 436                 if (!capable(CAP_NET_ADMIN))
 437                         ret = -EPERM;
 438                 else
 439                         ret = sirdev_schedule_mode(dev, irq->ifr_mode);
 440                 /* cannot sleep here for completion
 441                  * we are called from network layer with rtnl hold
 442                  */
 443                 break;
 444 #endif
 445         default:
 446                 ret = -EOPNOTSUPP;
 447         }
 448
 449         return ret;
 450 }
 451
 452 /* ----------------------------------------------------------------------------- */
 453
 454 #define SIRBUF_ALLOCSIZE 4269   /* worst case size of a wrapped IrLAP frame */
 455
 456 static int sirdev_alloc_buffers(struct sir_dev *dev)
 457 {
 458         dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
 459         dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
 460
 461         /* Bootstrap ZeroCopy Rx */
 462         dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
 463         if (dev->rx_buff.skb == NULL)
 464                 return -ENOMEM;
 465         skb_reserve(dev->rx_buff.skb, 1);
 466         dev->rx_buff.head = dev->rx_buff.skb->data;
 467
 468         dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
 469         if (dev->tx_buff.head == NULL) {
 470                 kfree_skb(dev->rx_buff.skb);
 471                 dev->rx_buff.skb = NULL;
 472                 dev->rx_buff.head = NULL;
 473                 return -ENOMEM;
 474         }
 475
 476         dev->tx_buff.data = dev->tx_buff.head;
 477         dev->rx_buff.data = dev->rx_buff.head;
 478         dev->tx_buff.len = 0;
 479         dev->rx_buff.len = 0;
 480
 481         dev->rx_buff.in_frame = FALSE;
 482         dev->rx_buff.state = OUTSIDE_FRAME;
 483         return 0;
 484 };
 485
 486 static void sirdev_free_buffers(struct sir_dev *dev)
 487 {
 488         if (dev->rx_buff.skb)
 489                 kfree_skb(dev->rx_buff.skb);
 490         if (dev->tx_buff.head)
 491                 kfree(dev->tx_buff.head);
 492         dev->rx_buff.head = dev->tx_buff.head = NULL;
 493         dev->rx_buff.skb = NULL;
 494 }
 495
 496 static int sirdev_open(struct net_device *ndev)
 497 {
 498         struct sir_dev *dev = ndev->priv;
 499         const struct sir_driver *drv = dev->drv;
 500
 501         if (!drv)
 502                 return -ENODEV;
 503
 504         /* increase the reference count of the driver module before doing serious stuff */
 505         if (!try_module_get(drv->owner))
 506                 return -ESTALE;
 507
 508         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 509
 510         if (sirdev_alloc_buffers(dev))
 511                 goto errout_dec;
 512
 513         if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
 514                 goto errout_free;
 515
 516         sirdev_enable_rx(dev);
 517         dev->raw_tx = 0;
 518
 519         netif_start_queue(ndev);
 520         dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
 521         if (!dev->irlap)
 522                 goto errout_stop;
 523
 524         netif_wake_queue(ndev);
 525
 526         IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, dev->speed);
 527
 528         return 0;
 529
 530 errout_stop:
 531         atomic_set(&dev->enable_rx, 0);
 532         if (dev->drv->stop_dev)
 533                 dev->drv->stop_dev(dev);
 534 errout_free:
 535         sirdev_free_buffers(dev);
 536 errout_dec:
 537         module_put(drv->owner);
 538         return -EAGAIN;
 539 }
 540
 541 static int sirdev_close(struct net_device *ndev)
 542 {
 543         struct sir_dev *dev = ndev->priv;
 544         const struct sir_driver *drv;
 545
 546 //      IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 547
 548         netif_stop_queue(ndev);
 549
 550         down(&dev->fsm.sem);            /* block on pending config completion */
 551
 552         atomic_set(&dev->enable_rx, 0);
 553
 554         if (unlikely(!dev->irlap))
 555                 goto out;
 556         irlap_close(dev->irlap);
 557         dev->irlap = NULL;
 558
 559         drv = dev->drv;
 560         if (unlikely(!drv  ||  !dev->priv))
 561                 goto out;
 562
 563         if (drv->stop_dev)
 564                 drv->stop_dev(dev);
 565
 566         sirdev_free_buffers(dev);
 567         module_put(drv->owner);
 568
 569 out:
 570         dev->speed = 0;
 571         up(&dev->fsm.sem);
 572         return 0;
 573 }
 574
 575 /* ----------------------------------------------------------------------------- */
 576
 577 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
 578 {
 579         struct net_device *ndev;
 580         struct sir_dev *dev;
 581
 582         IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, name);
 583
 584         /* instead of adding tests to protect against drv->do_write==NULL
 585          * at several places we refuse to create a sir_dev instance for
 586          * drivers which don't implement do_write.
 587          */
 588         if (!drv ||  !drv->do_write)
 589                 return NULL;
 590
 591         /*
 592          *  Allocate new instance of the device
 593          */
 594         ndev = alloc_irdadev(sizeof(*dev));
 595         if (ndev == NULL) {
 596                 ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__);
 597                 goto out;
 598         }
 599         dev = ndev->priv;
 600
 601         irda_init_max_qos_capabilies(&dev->qos);
 602         dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
 603         dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
 604         irda_qos_bits_to_value(&dev->qos);
 605
 606         strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
 607
 608         atomic_set(&dev->enable_rx, 0);
 609         dev->tx_skb = NULL;
 610
 611         spin_lock_init(&dev->tx_lock);
 612         init_MUTEX(&dev->fsm.sem);
 613
 614         INIT_LIST_HEAD(&dev->fsm.rq.lh_request);
 615         dev->fsm.rq.pending = 0;
 616         init_timer(&dev->fsm.rq.timer);
 617
 618         dev->drv = drv;
 619         dev->netdev = ndev;
 620
 621         SET_MODULE_OWNER(ndev);
 622
 623         /* Override the network functions we need to use */
 624         ndev->hard_start_xmit = sirdev_hard_xmit;
 625         ndev->open = sirdev_open;
 626         ndev->stop = sirdev_close;
 627         ndev->get_stats = sirdev_get_stats;
 628         ndev->do_ioctl = sirdev_ioctl;
 629
 630         if (register_netdev(ndev)) {
 631                 ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
 632                 goto out_freenetdev;
 633         }
 634
 635         return dev;
 636
 637 out_freenetdev:
 638         free_netdev(ndev);
 639 out:
 640         return NULL;
 641 }
 642
 643 int sirdev_put_instance(struct sir_dev *dev)
 644 {
 645         int err = 0;
 646
 647         IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 648
 649         atomic_set(&dev->enable_rx, 0);
 650
 651         netif_carrier_off(dev->netdev);
 652         netif_device_detach(dev->netdev);
 653
 654         if (dev->dongle_drv)
 655                 err = sirdev_schedule_dongle_close(dev);
 656         if (err)
 657                 ERROR("%s - error %d\n", __FUNCTION__, err);
 658
 659         sirdev_close(dev->netdev);
 660
 661         down(&dev->fsm.sem);
 662         dev->fsm.state = SIRDEV_STATE_DEAD;     /* mark staled */
 663         dev->dongle_drv = NULL;
 664         dev->priv = NULL;
 665         up(&dev->fsm.sem);
 666
 667         /* Remove netdevice */
 668         unregister_netdev(dev->netdev);
 669
 670         free_netdev(dev->netdev);
 671
 672         return 0;
 673 }
 674