git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/delay.h>
  19
  20 #include <net/irda/irda.h>
  21 #include <net/irda/wrapper.h>
  22 #include <net/irda/irda_device.h>
  23
  24 #include "sir-dev.h"
  25
  26 /***************************************************************************/
  27
  28 void sirdev_enable_rx(struct sir_dev *dev)
  29 {
  30         if (unlikely(atomic_read(&dev->enable_rx)))
  31                 return;
  32
  33         /* flush rx-buffer - should also help in case of problems with echo cancelation */
  34         dev->rx_buff.data = dev->rx_buff.head;
  35         dev->rx_buff.len = 0;
  36         dev->rx_buff.in_frame = FALSE;
  37         dev->rx_buff.state = OUTSIDE_FRAME;
  38         atomic_set(&dev->enable_rx, 1);
  39 }
  40
  41 static int sirdev_is_receiving(struct sir_dev *dev)
  42 {
  43         if (!atomic_read(&dev->enable_rx))
  44                 return 0;
  45
  46         return (dev->rx_buff.state != OUTSIDE_FRAME);
  47 }
  48
  49 int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
  50 {
  51         int err;
  52
  53         IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, type);
  54
  55         err = sirdev_schedule_dongle_open(dev, type);
  56         if (unlikely(err))
  57                 return err;
  58         down(&dev->fsm.sem);            /* block until config change completed */
  59         err = dev->fsm.result;
  60         up(&dev->fsm.sem);
  61         return err;
  62 }
  63
  64 /* used by dongle drivers for dongle programming */
  65
  66 int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
  67 {
  68         unsigned long flags;
  69         int ret;
  70
  71         if (unlikely(len > dev->tx_buff.truesize))
  72                 return -ENOSPC;
  73
  74         spin_lock_irqsave(&dev->tx_lock, flags);        /* serialize with other tx operations */
  75         while (dev->tx_buff.len > 0) {                  /* wait until tx idle */
  76                 spin_unlock_irqrestore(&dev->tx_lock, flags);
  77                 msleep(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                         IRDA_ERROR("%s: drv->do_write failed (%d)\n",
 158                                    __FUNCTION__, actual);
 159                         if ((skb=dev->tx_skb) != NULL) {
 160                                 dev->tx_skb = NULL;
 161                                 dev_kfree_skb_any(skb);
 162                                 dev->stats.tx_errors++;
 163                                 dev->stats.tx_dropped++;
 164                         }
 165                         dev->tx_buff.len = 0;
 166                 }
 167                 if (dev->tx_buff.len > 0)
 168                         goto done;      /* more data to send later */
 169         }
 170
 171         if (unlikely(dev->raw_tx != 0)) {
 172                 /* in raw mode we are just done now after the buffer was sent
 173                  * completely. Since this was requested by some dongle driver
 174                  * running under the control of the irda-thread we must take
 175                  * care here not to re-enable the queue. The queue will be
 176                  * restarted when the irda-thread has completed the request.
 177                  */
 178
 179                 IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
 180                 dev->raw_tx = 0;
 181                 goto done;      /* no post-frame handling in raw mode */
 182         }
 183
 184         /* we have finished now sending this skb.
 185          * update statistics and free the skb.
 186          * finally we check and trigger a pending speed change, if any.
 187          * if not we switch to rx mode and wake the queue for further
 188          * packets.
 189          * note the scheduled speed request blocks until the lower
 190          * client driver and the corresponding hardware has really
 191          * finished sending all data (xmit fifo drained f.e.)
 192          * before the speed change gets finally done and the queue
 193          * re-activated.
 194          */
 195
 196         IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
 197
 198         if ((skb=dev->tx_skb) != NULL) {
 199                 dev->tx_skb = NULL;
 200                 dev->stats.tx_packets++;
 201                 dev->stats.tx_bytes += skb->len;
 202                 dev_kfree_skb_any(skb);
 203         }
 204
 205         if (unlikely(dev->new_speed > 0)) {
 206                 IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
 207                 err = sirdev_schedule_speed(dev, dev->new_speed);
 208                 if (unlikely(err)) {
 209                         /* should never happen
 210                          * forget the speed change and hope the stack recovers
 211                          */
 212                         IRDA_ERROR("%s - schedule speed change failed: %d\n",
 213                                    __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 done:
 228         spin_unlock_irqrestore(&dev->tx_lock, flags);
 229 }
 230
 231 /* called from client driver - likely with bh-context - to give us
 232  * some more received bytes. We put them into the rx-buffer,
 233  * normally unwrapping and building LAP-skb's (unless rx disabled)
 234  */
 235
 236 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
 237 {
 238         if (!dev || !dev->netdev) {
 239                 IRDA_WARNING("%s(), not ready yet!\n", __FUNCTION__);
 240                 return -1;
 241         }
 242
 243         if (!dev->irlap) {
 244                 IRDA_WARNING("%s - too early: %p / %zd!\n",
 245                              __FUNCTION__, cp, count);
 246                 return -1;
 247         }
 248
 249         if (cp==NULL) {
 250                 /* error already at lower level receive
 251                  * just update stats and set media busy
 252                  */
 253                 irda_device_set_media_busy(dev->netdev, TRUE);
 254                 dev->stats.rx_dropped++;
 255                 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count);
 256                 return 0;
 257         }
 258
 259         /* Read the characters into the buffer */
 260         if (likely(atomic_read(&dev->enable_rx))) {
 261                 while (count--)
 262                         /* Unwrap and destuff one byte */
 263                         async_unwrap_char(dev->netdev, &dev->stats,
 264                                           &dev->rx_buff, *cp++);
 265         } else {
 266                 while (count--) {
 267                         /* rx not enabled: save the raw bytes and never
 268                          * trigger any netif_rx. The received bytes are flushed
 269                          * later when we re-enable rx but might be read meanwhile
 270                          * by the dongle driver.
 271                          */
 272                         dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
 273
 274                         /* What should we do when the buffer is full? */
 275                         if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
 276                                 dev->rx_buff.len = 0;
 277                 }
 278         }
 279
 280         return 0;
 281 }
 282
 283 /**********************************************************************/
 284
 285 /* callbacks from network layer */
 286
 287 static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
 288 {
 289         struct sir_dev *dev = ndev->priv;
 290
 291         return (dev) ? &dev->stats : NULL;
 292 }
 293
 294 static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
 295 {
 296         struct sir_dev *dev = ndev->priv;
 297         unsigned long flags;
 298         int actual = 0;
 299         int err;
 300         s32 speed;
 301
 302         IRDA_ASSERT(dev != NULL, return 0;);
 303
 304         netif_stop_queue(ndev);
 305
 306         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len);
 307
 308         speed = irda_get_next_speed(skb);
 309         if ((speed != dev->speed) && (speed != -1)) {
 310                 if (!skb->len) {
 311                         err = sirdev_schedule_speed(dev, speed);
 312                         if (unlikely(err == -EWOULDBLOCK)) {
 313                                 /* Failed to initiate the speed change, likely the fsm
 314                                  * is still busy (pretty unlikely, but...)
 315                                  * We refuse to accept the skb and return with the queue
 316                                  * stopped so the network layer will retry after the
 317                                  * fsm completes and wakes the queue.
 318                                  */
 319                                  return 1;
 320                         }
 321                         else if (unlikely(err)) {
 322                                 /* other fatal error - forget the speed change and
 323                                  * hope the stack will recover somehow
 324                                  */
 325                                  netif_start_queue(ndev);
 326                         }
 327                         /* else: success
 328                          *      speed change in progress now
 329                          *      on completion the queue gets restarted
 330                          */
 331
 332                         dev_kfree_skb_any(skb);
 333                         return 0;
 334                 } else
 335                         dev->new_speed = speed;
 336         }
 337
 338         /* Init tx buffer*/
 339         dev->tx_buff.data = dev->tx_buff.head;
 340
 341         /* Check problems */
 342         if(spin_is_locked(&dev->tx_lock)) {
 343                 IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
 344         }
 345
 346         /* serialize with write completion */
 347         spin_lock_irqsave(&dev->tx_lock, flags);
 348
 349         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
 350         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
 351
 352         /* transmission will start now - disable receive.
 353          * if we are just in the middle of an incoming frame,
 354          * treat it as collision. probably it's a good idea to
 355          * reset the rx_buf OUTSIDE_FRAME in this case too?
 356          */
 357         atomic_set(&dev->enable_rx, 0);
 358         if (unlikely(sirdev_is_receiving(dev)))
 359                 dev->stats.collisions++;
 360
 361         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
 362
 363         if (likely(actual > 0)) {
 364                 dev->tx_skb = skb;
 365                 ndev->trans_start = jiffies;
 366                 dev->tx_buff.data += actual;
 367                 dev->tx_buff.len -= actual;
 368         }
 369         else if (unlikely(actual < 0)) {
 370                 /* could be dropped later when we have tx_timeout to recover */
 371                 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
 372                            __FUNCTION__, actual);
 373                 dev_kfree_skb_any(skb);
 374                 dev->stats.tx_errors++;
 375                 dev->stats.tx_dropped++;
 376                 netif_wake_queue(ndev);
 377         }
 378         spin_unlock_irqrestore(&dev->tx_lock, flags);
 379
 380         return 0;
 381 }
 382
 383 /* called from network layer with rtnl hold */
 384
 385 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
 386 {
 387         struct if_irda_req *irq = (struct if_irda_req *) rq;
 388         struct sir_dev *dev = ndev->priv;
 389         int ret = 0;
 390
 391         IRDA_ASSERT(dev != NULL, return -1;);
 392
 393         IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd);
 394
 395         switch (cmd) {
 396         case SIOCSBANDWIDTH: /* Set bandwidth */
 397                 if (!capable(CAP_NET_ADMIN))
 398                         ret = -EPERM;
 399                 else
 400                         ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
 401                 /* cannot sleep here for completion
 402                  * we are called from network layer with rtnl hold
 403                  */
 404                 break;
 405
 406         case SIOCSDONGLE: /* Set dongle */
 407                 if (!capable(CAP_NET_ADMIN))
 408                         ret = -EPERM;
 409                 else
 410                         ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
 411                 /* cannot sleep here for completion
 412                  * we are called from network layer with rtnl hold
 413                  */
 414                 break;
 415
 416         case SIOCSMEDIABUSY: /* Set media busy */
 417                 if (!capable(CAP_NET_ADMIN))
 418                         ret = -EPERM;
 419                 else
 420                         irda_device_set_media_busy(dev->netdev, TRUE);
 421                 break;
 422
 423         case SIOCGRECEIVING: /* Check if we are receiving right now */
 424                 irq->ifr_receiving = sirdev_is_receiving(dev);
 425                 break;
 426
 427         case SIOCSDTRRTS:
 428                 if (!capable(CAP_NET_ADMIN))
 429                         ret = -EPERM;
 430                 else
 431                         ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
 432                 /* cannot sleep here for completion
 433                  * we are called from network layer with rtnl hold
 434                  */
 435                 break;
 436
 437         case SIOCSMODE:
 438 #if 0
 439                 if (!capable(CAP_NET_ADMIN))
 440                         ret = -EPERM;
 441                 else
 442                         ret = sirdev_schedule_mode(dev, irq->ifr_mode);
 443                 /* cannot sleep here for completion
 444                  * we are called from network layer with rtnl hold
 445                  */
 446                 break;
 447 #endif
 448         default:
 449                 ret = -EOPNOTSUPP;
 450         }
 451
 452         return ret;
 453 }
 454
 455 /* ----------------------------------------------------------------------------- */
 456
 457 #define SIRBUF_ALLOCSIZE 4269   /* worst case size of a wrapped IrLAP frame */
 458
 459 static int sirdev_alloc_buffers(struct sir_dev *dev)
 460 {
 461         dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
 462         dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
 463
 464         /* Bootstrap ZeroCopy Rx */
 465         dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
 466         if (dev->rx_buff.skb == NULL)
 467                 return -ENOMEM;
 468         skb_reserve(dev->rx_buff.skb, 1);
 469         dev->rx_buff.head = dev->rx_buff.skb->data;
 470
 471         dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
 472         if (dev->tx_buff.head == NULL) {
 473                 kfree_skb(dev->rx_buff.skb);
 474                 dev->rx_buff.skb = NULL;
 475                 dev->rx_buff.head = NULL;
 476                 return -ENOMEM;
 477         }
 478
 479         dev->tx_buff.data = dev->tx_buff.head;
 480         dev->rx_buff.data = dev->rx_buff.head;
 481         dev->tx_buff.len = 0;
 482         dev->rx_buff.len = 0;
 483
 484         dev->rx_buff.in_frame = FALSE;
 485         dev->rx_buff.state = OUTSIDE_FRAME;
 486         return 0;
 487 };
 488
 489 static void sirdev_free_buffers(struct sir_dev *dev)
 490 {
 491         if (dev->rx_buff.skb)
 492                 kfree_skb(dev->rx_buff.skb);
 493         kfree(dev->tx_buff.head);
 494         dev->rx_buff.head = dev->tx_buff.head = NULL;
 495         dev->rx_buff.skb = NULL;
 496 }
 497
 498 static int sirdev_open(struct net_device *ndev)
 499 {
 500         struct sir_dev *dev = ndev->priv;
 501         const struct sir_driver *drv = dev->drv;
 502
 503         if (!drv)
 504                 return -ENODEV;
 505
 506         /* increase the reference count of the driver module before doing serious stuff */
 507         if (!try_module_get(drv->owner))
 508                 return -ESTALE;
 509
 510         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 511
 512         if (sirdev_alloc_buffers(dev))
 513                 goto errout_dec;
 514
 515         if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
 516                 goto errout_free;
 517
 518         sirdev_enable_rx(dev);
 519         dev->raw_tx = 0;
 520
 521         netif_start_queue(ndev);
 522         dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
 523         if (!dev->irlap)
 524                 goto errout_stop;
 525
 526         netif_wake_queue(ndev);
 527
 528         IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, dev->speed);
 529
 530         return 0;
 531
 532 errout_stop:
 533         atomic_set(&dev->enable_rx, 0);
 534         if (dev->drv->stop_dev)
 535                 dev->drv->stop_dev(dev);
 536 errout_free:
 537         sirdev_free_buffers(dev);
 538 errout_dec:
 539         module_put(drv->owner);
 540         return -EAGAIN;
 541 }
 542
 543 static int sirdev_close(struct net_device *ndev)
 544 {
 545         struct sir_dev *dev = ndev->priv;
 546         const struct sir_driver *drv;
 547
 548 //      IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 549
 550         netif_stop_queue(ndev);
 551
 552         down(&dev->fsm.sem);            /* block on pending config completion */
 553
 554         atomic_set(&dev->enable_rx, 0);
 555
 556         if (unlikely(!dev->irlap))
 557                 goto out;
 558         irlap_close(dev->irlap);
 559         dev->irlap = NULL;
 560
 561         drv = dev->drv;
 562         if (unlikely(!drv  ||  !dev->priv))
 563                 goto out;
 564
 565         if (drv->stop_dev)
 566                 drv->stop_dev(dev);
 567
 568         sirdev_free_buffers(dev);
 569         module_put(drv->owner);
 570
 571 out:
 572         dev->speed = 0;
 573         up(&dev->fsm.sem);
 574         return 0;
 575 }
 576
 577 /* ----------------------------------------------------------------------------- */
 578
 579 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
 580 {
 581         struct net_device *ndev;
 582         struct sir_dev *dev;
 583
 584         IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, name);
 585
 586         /* instead of adding tests to protect against drv->do_write==NULL
 587          * at several places we refuse to create a sir_dev instance for
 588          * drivers which don't implement do_write.
 589          */
 590         if (!drv ||  !drv->do_write)
 591                 return NULL;
 592
 593         /*
 594          *  Allocate new instance of the device
 595          */
 596         ndev = alloc_irdadev(sizeof(*dev));
 597         if (ndev == NULL) {
 598                 IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__);
 599                 goto out;
 600         }
 601         dev = ndev->priv;
 602
 603         irda_init_max_qos_capabilies(&dev->qos);
 604         dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
 605         dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
 606         irda_qos_bits_to_value(&dev->qos);
 607
 608         strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
 609
 610         atomic_set(&dev->enable_rx, 0);
 611         dev->tx_skb = NULL;
 612
 613         spin_lock_init(&dev->tx_lock);
 614         init_MUTEX(&dev->fsm.sem);
 615
 616         INIT_LIST_HEAD(&dev->fsm.rq.lh_request);
 617         dev->fsm.rq.pending = 0;
 618         init_timer(&dev->fsm.rq.timer);
 619
 620         dev->drv = drv;
 621         dev->netdev = ndev;
 622
 623         SET_MODULE_OWNER(ndev);
 624
 625         /* Override the network functions we need to use */
 626         ndev->hard_start_xmit = sirdev_hard_xmit;
 627         ndev->open = sirdev_open;
 628         ndev->stop = sirdev_close;
 629         ndev->get_stats = sirdev_get_stats;
 630         ndev->do_ioctl = sirdev_ioctl;
 631
 632         if (register_netdev(ndev)) {
 633                 IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
 634                 goto out_freenetdev;
 635         }
 636
 637         return dev;
 638
 639 out_freenetdev:
 640         free_netdev(ndev);
 641 out:
 642         return NULL;
 643 }
 644
 645 int sirdev_put_instance(struct sir_dev *dev)
 646 {
 647         int err = 0;
 648
 649         IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 650
 651         atomic_set(&dev->enable_rx, 0);
 652
 653         netif_carrier_off(dev->netdev);
 654         netif_device_detach(dev->netdev);
 655
 656         if (dev->dongle_drv)
 657                 err = sirdev_schedule_dongle_close(dev);
 658         if (err)
 659                 IRDA_ERROR("%s - error %d\n", __FUNCTION__, err);
 660
 661         sirdev_close(dev->netdev);
 662
 663         down(&dev->fsm.sem);
 664         dev->fsm.state = SIRDEV_STATE_DEAD;     /* mark staled */
 665         dev->dongle_drv = NULL;
 666         dev->priv = NULL;
 667         up(&dev->fsm.sem);
 668
 669         /* Remove netdevice */
 670         unregister_netdev(dev->netdev);
 671
 672         free_netdev(dev->netdev);
 673
 674         return 0;
 675 }
 676