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                         spin_unlock_irqrestore(&dev->tx_lock, flags);
 168                         return;
 169                 }
 170         }
 171
 172         if (unlikely(dev->raw_tx != 0)) {
 173                 /* in raw mode we are just done now after the buffer was sent
 174                  * completely. Since this was requested by some dongle driver
 175                  * running under the control of the irda-thread we must take
 176                  * care here not to re-enable the queue. The queue will be
 177                  * restarted when the irda-thread has completed the request.
 178                  */
 179
 180                 IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
 181                 dev->raw_tx = 0;
 182                 return;
 183         }
 184
 185         /* we have finished now sending this skb.
 186          * update statistics and free the skb.
 187          * finally we check and trigger a pending speed change, if any.
 188          * if not we switch to rx mode and wake the queue for further
 189          * packets.
 190          * note the scheduled speed request blocks until the lower
 191          * client driver and the corresponding hardware has really
 192          * finished sending all data (xmit fifo drained f.e.)
 193          * before the speed change gets finally done and the queue
 194          * re-activated.
 195          */
 196
 197         IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
 198
 199         if ((skb=dev->tx_skb) != NULL) {
 200                 dev->tx_skb = NULL;
 201                 dev->stats.tx_packets++;
 202                 dev->stats.tx_bytes += skb->len;
 203                 dev_kfree_skb_any(skb);
 204         }
 205
 206         if (unlikely(dev->new_speed > 0)) {
 207                 IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
 208                 err = sirdev_schedule_speed(dev, dev->new_speed);
 209                 if (unlikely(err)) {
 210                         /* should never happen
 211                          * forget the speed change and hope the stack recovers
 212                          */
 213                         ERROR("%s - schedule speed change failed: %d\n", __FUNCTION__, err);
 214                         netif_wake_queue(dev->netdev);
 215                 }
 216                 /* else: success
 217                  *      speed change in progress now
 218                  *      on completion dev->new_speed gets cleared,
 219                  *      rx-reenabled and the queue restarted
 220                  */
 221         }
 222         else {
 223                 sirdev_enable_rx(dev);
 224                 netif_wake_queue(dev->netdev);
 225         }
 226
 227         spin_unlock_irqrestore(&dev->tx_lock, flags);
 228 }
 229
 230 /* called from client driver - likely with bh-context - to give us
 231  * some more received bytes. We put them into the rx-buffer,
 232  * normally unwrapping and building LAP-skb's (unless rx disabled)
 233  */
 234
 235 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
 236 {
 237         if (!dev || !dev->netdev) {
 238                 WARNING("%s(), not ready yet!\n", __FUNCTION__);
 239                 return -1;
 240         }
 241
 242         if (!dev->irlap) {
 243                 WARNING("%s - too early: %p / %zd!\n",
 244                         __FUNCTION__, cp, count);
 245                 return -1;
 246         }
 247
 248         if (cp==NULL) {
 249                 /* error already at lower level receive
 250                  * just update stats and set media busy
 251                  */
 252                 irda_device_set_media_busy(dev->netdev, TRUE);
 253                 dev->stats.rx_dropped++;
 254                 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count);
 255                 return 0;
 256         }
 257
 258         /* Read the characters into the buffer */
 259         if (likely(atomic_read(&dev->enable_rx))) {
 260                 while (count--)
 261                         /* Unwrap and destuff one byte */
 262                         async_unwrap_char(dev->netdev, &dev->stats,
 263                                           &dev->rx_buff, *cp++);
 264         } else {
 265                 while (count--) {
 266                         /* rx not enabled: save the raw bytes and never
 267                          * trigger any netif_rx. The received bytes are flushed
 268                          * later when we re-enable rx but might be read meanwhile
 269                          * by the dongle driver.
 270                          */
 271                         dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
 272
 273                         /* What should we do when the buffer is full? */
 274                         if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
 275                                 dev->rx_buff.len = 0;
 276                 }
 277         }
 278
 279         return 0;
 280 }
 281
 282 /**********************************************************************/
 283
 284 /* callbacks from network layer */
 285
 286 static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
 287 {
 288         struct sir_dev *dev = ndev->priv;
 289
 290         return (dev) ? &dev->stats : NULL;
 291 }
 292
 293 static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
 294 {
 295         struct sir_dev *dev = ndev->priv;
 296         unsigned long flags;
 297         int actual = 0;
 298         int err;
 299         s32 speed;
 300
 301         ASSERT(dev != NULL, return 0;);
 302
 303         netif_stop_queue(ndev);
 304
 305         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len);
 306
 307         speed = irda_get_next_speed(skb);
 308         if ((speed != dev->speed) && (speed != -1)) {
 309                 if (!skb->len) {
 310                         err = sirdev_schedule_speed(dev, speed);
 311                         if (unlikely(err == -EWOULDBLOCK)) {
 312                                 /* Failed to initiate the speed change, likely the fsm
 313                                  * is still busy (pretty unlikely, but...)
 314                                  * We refuse to accept the skb and return with the queue
 315                                  * stopped so the network layer will retry after the
 316                                  * fsm completes and wakes the queue.
 317                                  */
 318                                  return 1;
 319                         }
 320                         else if (unlikely(err)) {
 321                                 /* other fatal error - forget the speed change and
 322                                  * hope the stack will recover somehow
 323                                  */
 324                                  netif_start_queue(ndev);
 325                         }
 326                         /* else: success
 327                          *      speed change in progress now
 328                          *      on completion the queue gets restarted
 329                          */
 330
 331                         dev_kfree_skb_any(skb);
 332                         return 0;
 333                 } else
 334                         dev->new_speed = speed;
 335         }
 336
 337         /* Init tx buffer*/
 338         dev->tx_buff.data = dev->tx_buff.head;
 339
 340         /* Check problems */
 341         if(spin_is_locked(&dev->tx_lock)) {
 342                 IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
 343         }
 344
 345         /* serialize with write completion */
 346         spin_lock_irqsave(&dev->tx_lock, flags);
 347
 348         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
 349         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
 350
 351         /* transmission will start now - disable receive.
 352          * if we are just in the middle of an incoming frame,
 353          * treat it as collision. probably it's a good idea to
 354          * reset the rx_buf OUTSIDE_FRAME in this case too?
 355          */
 356         atomic_set(&dev->enable_rx, 0);
 357         if (unlikely(sirdev_is_receiving(dev)))
 358                 dev->stats.collisions++;
 359
 360         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
 361
 362         if (likely(actual > 0)) {
 363                 dev->tx_skb = skb;
 364                 ndev->trans_start = jiffies;
 365                 dev->tx_buff.data += actual;
 366                 dev->tx_buff.len -= actual;
 367         }
 368         else if (unlikely(actual < 0)) {
 369                 /* could be dropped later when we have tx_timeout to recover */
 370                 ERROR("%s: drv->do_write failed (%d)\n", __FUNCTION__, actual);
 371                 dev_kfree_skb_any(skb);
 372                 dev->stats.tx_errors++;
 373                 dev->stats.tx_dropped++;
 374                 netif_wake_queue(ndev);
 375         }
 376         spin_unlock_irqrestore(&dev->tx_lock, flags);
 377
 378         return 0;
 379 }
 380
 381 /* called from network layer with rtnl hold */
 382
 383 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
 384 {
 385         struct if_irda_req *irq = (struct if_irda_req *) rq;
 386         struct sir_dev *dev = ndev->priv;
 387         int ret = 0;
 388
 389         ASSERT(dev != NULL, return -1;);
 390
 391         IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd);
 392
 393         switch (cmd) {
 394         case SIOCSBANDWIDTH: /* Set bandwidth */
 395                 if (!capable(CAP_NET_ADMIN))
 396                         ret = -EPERM;
 397                 else
 398                         ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
 399                 /* cannot sleep here for completion
 400                  * we are called from network layer with rtnl hold
 401                  */
 402                 break;
 403
 404         case SIOCSDONGLE: /* Set dongle */
 405                 if (!capable(CAP_NET_ADMIN))
 406                         ret = -EPERM;
 407                 else
 408                         ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
 409                 /* cannot sleep here for completion
 410                  * we are called from network layer with rtnl hold
 411                  */
 412                 break;
 413
 414         case SIOCSMEDIABUSY: /* Set media busy */
 415                 if (!capable(CAP_NET_ADMIN))
 416                         ret = -EPERM;
 417                 else
 418                         irda_device_set_media_busy(dev->netdev, TRUE);
 419                 break;
 420
 421         case SIOCGRECEIVING: /* Check if we are receiving right now */
 422                 irq->ifr_receiving = sirdev_is_receiving(dev);
 423                 break;
 424
 425         case SIOCSDTRRTS:
 426                 if (!capable(CAP_NET_ADMIN))
 427                         ret = -EPERM;
 428                 else
 429                         ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
 430                 /* cannot sleep here for completion
 431                  * we are called from network layer with rtnl hold
 432                  */
 433                 break;
 434
 435         case SIOCSMODE:
 436 #if 0
 437                 if (!capable(CAP_NET_ADMIN))
 438                         ret = -EPERM;
 439                 else
 440                         ret = sirdev_schedule_mode(dev, irq->ifr_mode);
 441                 /* cannot sleep here for completion
 442                  * we are called from network layer with rtnl hold
 443                  */
 444                 break;
 445 #endif
 446         default:
 447                 ret = -EOPNOTSUPP;
 448         }
 449
 450         return ret;
 451 }
 452
 453 /* ----------------------------------------------------------------------------- */
 454
 455 #define SIRBUF_ALLOCSIZE 4269   /* worst case size of a wrapped IrLAP frame */
 456
 457 static int sirdev_alloc_buffers(struct sir_dev *dev)
 458 {
 459         dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
 460         dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
 461
 462         /* Bootstrap ZeroCopy Rx */
 463         dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
 464         if (dev->rx_buff.skb == NULL)
 465                 return -ENOMEM;
 466         skb_reserve(dev->rx_buff.skb, 1);
 467         dev->rx_buff.head = dev->rx_buff.skb->data;
 468
 469         dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
 470         if (dev->tx_buff.head == NULL) {
 471                 kfree_skb(dev->rx_buff.skb);
 472                 dev->rx_buff.skb = NULL;
 473                 dev->rx_buff.head = NULL;
 474                 return -ENOMEM;
 475         }
 476
 477         dev->tx_buff.data = dev->tx_buff.head;
 478         dev->rx_buff.data = dev->rx_buff.head;
 479         dev->tx_buff.len = 0;
 480         dev->rx_buff.len = 0;
 481
 482         dev->rx_buff.in_frame = FALSE;
 483         dev->rx_buff.state = OUTSIDE_FRAME;
 484         return 0;
 485 };
 486
 487 static void sirdev_free_buffers(struct sir_dev *dev)
 488 {
 489         if (dev->rx_buff.skb)
 490                 kfree_skb(dev->rx_buff.skb);
 491         if (dev->tx_buff.head)
 492                 kfree(dev->tx_buff.head);
 493         dev->rx_buff.head = dev->tx_buff.head = NULL;
 494         dev->rx_buff.skb = NULL;
 495 }
 496
 497 static int sirdev_open(struct net_device *ndev)
 498 {
 499         struct sir_dev *dev = ndev->priv;
 500         const struct sir_driver *drv = dev->drv;
 501
 502         if (!drv)
 503                 return -ENODEV;
 504
 505         /* increase the reference count of the driver module before doing serious stuff */
 506         if (!try_module_get(drv->owner))
 507                 return -ESTALE;
 508
 509         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 510
 511         if (sirdev_alloc_buffers(dev))
 512                 goto errout_dec;
 513
 514         if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
 515                 goto errout_free;
 516
 517         sirdev_enable_rx(dev);
 518         dev->raw_tx = 0;
 519
 520         netif_start_queue(ndev);
 521         dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
 522         if (!dev->irlap)
 523                 goto errout_stop;
 524
 525         netif_wake_queue(ndev);
 526
 527         IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, dev->speed);
 528
 529         return 0;
 530
 531 errout_stop:
 532         atomic_set(&dev->enable_rx, 0);
 533         if (dev->drv->stop_dev)
 534                 dev->drv->stop_dev(dev);
 535 errout_free:
 536         sirdev_free_buffers(dev);
 537 errout_dec:
 538         module_put(drv->owner);
 539         return -EAGAIN;
 540 }
 541
 542 static int sirdev_close(struct net_device *ndev)
 543 {
 544         struct sir_dev *dev = ndev->priv;
 545         const struct sir_driver *drv;
 546
 547 //      IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 548
 549         netif_stop_queue(ndev);
 550
 551         down(&dev->fsm.sem);            /* block on pending config completion */
 552
 553         atomic_set(&dev->enable_rx, 0);
 554
 555         if (unlikely(!dev->irlap))
 556                 goto out;
 557         irlap_close(dev->irlap);
 558         dev->irlap = NULL;
 559
 560         drv = dev->drv;
 561         if (unlikely(!drv  ||  !dev->priv))
 562                 goto out;
 563
 564         if (drv->stop_dev)
 565                 drv->stop_dev(dev);
 566
 567         sirdev_free_buffers(dev);
 568         module_put(drv->owner);
 569
 570 out:
 571         dev->speed = 0;
 572         up(&dev->fsm.sem);
 573         return 0;
 574 }
 575
 576 /* ----------------------------------------------------------------------------- */
 577
 578 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
 579 {
 580         struct net_device *ndev;
 581         struct sir_dev *dev;
 582
 583         IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, name);
 584
 585         /* instead of adding tests to protect against drv->do_write==NULL
 586          * at several places we refuse to create a sir_dev instance for
 587          * drivers which don't implement do_write.
 588          */
 589         if (!drv ||  !drv->do_write)
 590                 return NULL;
 591
 592         /*
 593          *  Allocate new instance of the device
 594          */
 595         ndev = alloc_irdadev(sizeof(*dev));
 596         if (ndev == NULL) {
 597                 ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__);
 598                 goto out;
 599         }
 600         dev = ndev->priv;
 601
 602         irda_init_max_qos_capabilies(&dev->qos);
 603         dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
 604         dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
 605         irda_qos_bits_to_value(&dev->qos);
 606
 607         strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
 608
 609         atomic_set(&dev->enable_rx, 0);
 610         dev->tx_skb = NULL;
 611
 612         spin_lock_init(&dev->tx_lock);
 613         init_MUTEX(&dev->fsm.sem);
 614
 615         INIT_LIST_HEAD(&dev->fsm.rq.lh_request);
 616         dev->fsm.rq.pending = 0;
 617         init_timer(&dev->fsm.rq.timer);
 618
 619         dev->drv = drv;
 620         dev->netdev = ndev;
 621
 622         SET_MODULE_OWNER(ndev);
 623
 624         /* Override the network functions we need to use */
 625         ndev->hard_start_xmit = sirdev_hard_xmit;
 626         ndev->open = sirdev_open;
 627         ndev->stop = sirdev_close;
 628         ndev->get_stats = sirdev_get_stats;
 629         ndev->do_ioctl = sirdev_ioctl;
 630
 631         if (register_netdev(ndev)) {
 632                 ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
 633                 goto out_freenetdev;
 634         }
 635
 636         return dev;
 637
 638 out_freenetdev:
 639         free_netdev(ndev);
 640 out:
 641         return NULL;
 642 }
 643
 644 int sirdev_put_instance(struct sir_dev *dev)
 645 {
 646         int err = 0;
 647
 648         IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 649
 650         atomic_set(&dev->enable_rx, 0);
 651
 652         netif_carrier_off(dev->netdev);
 653         netif_device_detach(dev->netdev);
 654
 655         if (dev->dongle_drv)
 656                 err = sirdev_schedule_dongle_close(dev);
 657         if (err)
 658                 ERROR("%s - error %d\n", __FUNCTION__, err);
 659
 660         sirdev_close(dev->netdev);
 661
 662         down(&dev->fsm.sem);
 663         dev->fsm.state = SIRDEV_STATE_DEAD;     /* mark staled */
 664         dev->dongle_drv = NULL;
 665         dev->priv = NULL;
 666         up(&dev->fsm.sem);
 667
 668         /* Remove netdevice */
 669         unregister_netdev(dev->netdev);
 670
 671         free_netdev(dev->netdev);
 672
 673         return 0;
 674 }
 675