drivers/net/wireless/p54/main.c

   1 /*
   2  * mac80211 glue code for mac80211 Prism54 drivers
   3  *
   4  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   5  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  *
   8  * Based on:
   9  * - the islsm (softmac prism54) driver, which is:
  10  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
  11  * - stlc45xx driver
  12  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/firmware.h>
  21 #include <linux/etherdevice.h>
  22
  23 #include <net/mac80211.h>
  24
  25 #include "p54.h"
  26 #include "lmac.h"
  27
  28 static int modparam_nohwcrypt;
  29 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
  30 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  31 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  32 MODULE_DESCRIPTION("Softmac Prism54 common code");
  33 MODULE_LICENSE("GPL");
  34 MODULE_ALIAS("prism54common");
  35
  36 static int p54_sta_add_remove(struct ieee80211_hw *hw,
  37                               struct ieee80211_vif *vif,
  38                               struct ieee80211_sta *sta)
  39 {
  40         struct p54_common *priv = hw->priv;
  41
  42         /*
  43          * Notify the firmware that we don't want or we don't
  44          * need to buffer frames for this station anymore.
  45          */
  46
  47         p54_sta_unlock(priv, sta->addr);
  48
  49         return 0;
  50 }
  51
  52 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  53                               enum sta_notify_cmd notify_cmd,
  54                               struct ieee80211_sta *sta)
  55 {
  56         struct p54_common *priv = dev->priv;
  57
  58         switch (notify_cmd) {
  59         case STA_NOTIFY_AWAKE:
  60                 /* update the firmware's filter table */
  61                 p54_sta_unlock(priv, sta->addr);
  62                 break;
  63         default:
  64                 break;
  65         }
  66 }
  67
  68 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  69                         bool set)
  70 {
  71         struct p54_common *priv = dev->priv;
  72
  73         return p54_update_beacon_tim(priv, sta->aid, set);
  74 }
  75
  76 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
  77 {
  78         struct ieee80211_mgmt *mgmt = (void *)skb->data;
  79         u8 *pos, *end;
  80
  81         if (skb->len <= sizeof(mgmt))
  82                 return NULL;
  83
  84         pos = (u8 *)mgmt->u.beacon.variable;
  85         end = skb->data + skb->len;
  86         while (pos < end) {
  87                 if (pos + 2 + pos[1] > end)
  88                         return NULL;
  89
  90                 if (pos[0] == ie)
  91                         return pos;
  92
  93                 pos += 2 + pos[1];
  94         }
  95         return NULL;
  96 }
  97
  98 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
  99 {
 100         /*
 101          * the good excuse for this mess is ... the firmware.
 102          * The dummy TIM MUST be at the end of the beacon frame,
 103          * because it'll be overwritten!
 104          */
 105         u8 *tim;
 106         u8 dtim_len;
 107         u8 dtim_period;
 108         u8 *next;
 109
 110         tim = p54_find_ie(skb, WLAN_EID_TIM);
 111         if (!tim)
 112                 return 0;
 113
 114         dtim_len = tim[1];
 115         dtim_period = tim[3];
 116         next = tim + 2 + dtim_len;
 117
 118         if (dtim_len < 3)
 119                 return -EINVAL;
 120
 121         memmove(tim, next, skb_tail_pointer(skb) - next);
 122         tim = skb_tail_pointer(skb) - (dtim_len + 2);
 123
 124         /* add the dummy at the end */
 125         tim[0] = WLAN_EID_TIM;
 126         tim[1] = 3;
 127         tim[2] = 0;
 128         tim[3] = dtim_period;
 129         tim[4] = 0;
 130
 131         if (dtim_len > 3)
 132                 skb_trim(skb, skb->len - (dtim_len - 3));
 133
 134         return 0;
 135 }
 136
 137 static int p54_beacon_update(struct p54_common *priv,
 138                         struct ieee80211_vif *vif)
 139 {
 140         struct sk_buff *beacon;
 141         int ret;
 142
 143         beacon = ieee80211_beacon_get(priv->hw, vif);
 144         if (!beacon)
 145                 return -ENOMEM;
 146         ret = p54_beacon_format_ie_tim(beacon);
 147         if (ret)
 148                 return ret;
 149
 150         /*
 151          * During operation, the firmware takes care of beaconing.
 152          * The driver only needs to upload a new beacon template, once
 153          * the template was changed by the stack or userspace.
 154          *
 155          * LMAC API 3.2.2 also specifies that the driver does not need
 156          * to cancel the old beacon template by hand, instead the firmware
 157          * will release the previous one through the feedback mechanism.
 158          */
 159         WARN_ON(p54_tx_80211(priv->hw, beacon));
 160         priv->tsf_high32 = 0;
 161         priv->tsf_low32 = 0;
 162
 163         return 0;
 164 }
 165
 166 static int p54_start(struct ieee80211_hw *dev)
 167 {
 168         struct p54_common *priv = dev->priv;
 169         int err;
 170
 171         mutex_lock(&priv->conf_mutex);
 172         err = priv->open(dev);
 173         if (err)
 174                 goto out;
 175         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
 176         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
 177         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
 178         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
 179         err = p54_set_edcf(priv);
 180         if (err)
 181                 goto out;
 182
 183         memset(priv->bssid, ~0, ETH_ALEN);
 184         priv->mode = NL80211_IFTYPE_MONITOR;
 185         err = p54_setup_mac(priv);
 186         if (err) {
 187                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 188                 goto out;
 189         }
 190
 191         ieee80211_queue_delayed_work(dev, &priv->work, 0);
 192
 193         priv->softled_state = 0;
 194         err = p54_set_leds(priv);
 195
 196 out:
 197         mutex_unlock(&priv->conf_mutex);
 198         return err;
 199 }
 200
 201 static void p54_stop(struct ieee80211_hw *dev)
 202 {
 203         struct p54_common *priv = dev->priv;
 204         int i;
 205
 206         mutex_lock(&priv->conf_mutex);
 207         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 208         priv->softled_state = 0;
 209         p54_set_leds(priv);
 210
 211         cancel_delayed_work_sync(&priv->work);
 212
 213         priv->stop(dev);
 214         skb_queue_purge(&priv->tx_pending);
 215         skb_queue_purge(&priv->tx_queue);
 216         for (i = 0; i < P54_QUEUE_NUM; i++) {
 217                 priv->tx_stats[i].count = 0;
 218                 priv->tx_stats[i].len = 0;
 219         }
 220
 221         priv->beacon_req_id = cpu_to_le32(0);
 222         priv->tsf_high32 = priv->tsf_low32 = 0;
 223         mutex_unlock(&priv->conf_mutex);
 224 }
 225
 226 static int p54_add_interface(struct ieee80211_hw *dev,
 227                              struct ieee80211_vif *vif)
 228 {
 229         struct p54_common *priv = dev->priv;
 230
 231         mutex_lock(&priv->conf_mutex);
 232         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 233                 mutex_unlock(&priv->conf_mutex);
 234                 return -EOPNOTSUPP;
 235         }
 236
 237         priv->vif = vif;
 238
 239         switch (vif->type) {
 240         case NL80211_IFTYPE_STATION:
 241         case NL80211_IFTYPE_ADHOC:
 242         case NL80211_IFTYPE_AP:
 243         case NL80211_IFTYPE_MESH_POINT:
 244                 priv->mode = vif->type;
 245                 break;
 246         default:
 247                 mutex_unlock(&priv->conf_mutex);
 248                 return -EOPNOTSUPP;
 249         }
 250
 251         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 252         p54_setup_mac(priv);
 253         mutex_unlock(&priv->conf_mutex);
 254         return 0;
 255 }
 256
 257 static void p54_remove_interface(struct ieee80211_hw *dev,
 258                                  struct ieee80211_vif *vif)
 259 {
 260         struct p54_common *priv = dev->priv;
 261
 262         mutex_lock(&priv->conf_mutex);
 263         priv->vif = NULL;
 264
 265         /*
 266          * LMAC API 3.2.2 states that any active beacon template must be
 267          * canceled by the driver before attempting a mode transition.
 268          */
 269         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 270                 p54_tx_cancel(priv, priv->beacon_req_id);
 271                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 272         }
 273         priv->mode = NL80211_IFTYPE_MONITOR;
 274         memset(priv->mac_addr, 0, ETH_ALEN);
 275         memset(priv->bssid, 0, ETH_ALEN);
 276         p54_setup_mac(priv);
 277         mutex_unlock(&priv->conf_mutex);
 278 }
 279
 280 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 281 {
 282         int ret = 0;
 283         struct p54_common *priv = dev->priv;
 284         struct ieee80211_conf *conf = &dev->conf;
 285
 286         mutex_lock(&priv->conf_mutex);
 287         if (changed & IEEE80211_CONF_CHANGE_POWER)
 288                 priv->output_power = conf->power_level << 2;
 289         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 290                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 291                 if (ret)
 292                         goto out;
 293         }
 294         if (changed & IEEE80211_CONF_CHANGE_PS) {
 295                 ret = p54_set_ps(priv);
 296                 if (ret)
 297                         goto out;
 298         }
 299         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 300                 ret = p54_setup_mac(priv);
 301                 if (ret)
 302                         goto out;
 303         }
 304
 305 out:
 306         mutex_unlock(&priv->conf_mutex);
 307         return ret;
 308 }
 309
 310 static void p54_configure_filter(struct ieee80211_hw *dev,
 311                                  unsigned int changed_flags,
 312                                  unsigned int *total_flags,
 313                                  u64 multicast)
 314 {
 315         struct p54_common *priv = dev->priv;
 316
 317         *total_flags &= FIF_PROMISC_IN_BSS |
 318                         FIF_OTHER_BSS;
 319
 320         priv->filter_flags = *total_flags;
 321
 322         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
 323                 p54_setup_mac(priv);
 324 }
 325
 326 static int p54_conf_tx(struct ieee80211_hw *dev, u16 queue,
 327                        const struct ieee80211_tx_queue_params *params)
 328 {
 329         struct p54_common *priv = dev->priv;
 330         int ret;
 331
 332         mutex_lock(&priv->conf_mutex);
 333         if (queue < dev->queues) {
 334                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 335                         params->cw_min, params->cw_max, params->txop);
 336                 ret = p54_set_edcf(priv);
 337         } else
 338                 ret = -EINVAL;
 339         mutex_unlock(&priv->conf_mutex);
 340         return ret;
 341 }
 342
 343 static void p54_work(struct work_struct *work)
 344 {
 345         struct p54_common *priv = container_of(work, struct p54_common,
 346                                                work.work);
 347
 348         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 349                 return ;
 350
 351         /*
 352          * TODO: walk through tx_queue and do the following tasks
 353          *      1. initiate bursts.
 354          *      2. cancel stuck frames / reset the device if necessary.
 355          */
 356
 357         p54_fetch_statistics(priv);
 358 }
 359
 360 static int p54_get_stats(struct ieee80211_hw *dev,
 361                          struct ieee80211_low_level_stats *stats)
 362 {
 363         struct p54_common *priv = dev->priv;
 364
 365         memcpy(stats, &priv->stats, sizeof(*stats));
 366         return 0;
 367 }
 368
 369 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 370                                  struct ieee80211_vif *vif,
 371                                  struct ieee80211_bss_conf *info,
 372                                  u32 changed)
 373 {
 374         struct p54_common *priv = dev->priv;
 375
 376         mutex_lock(&priv->conf_mutex);
 377         if (changed & BSS_CHANGED_BSSID) {
 378                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 379                 p54_setup_mac(priv);
 380         }
 381
 382         if (changed & BSS_CHANGED_BEACON) {
 383                 p54_scan(priv, P54_SCAN_EXIT, 0);
 384                 p54_setup_mac(priv);
 385                 p54_beacon_update(priv, vif);
 386                 p54_set_edcf(priv);
 387         }
 388
 389         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 390                 priv->use_short_slot = info->use_short_slot;
 391                 p54_set_edcf(priv);
 392         }
 393         if (changed & BSS_CHANGED_BASIC_RATES) {
 394                 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
 395                         priv->basic_rate_mask = (info->basic_rates << 4);
 396                 else
 397                         priv->basic_rate_mask = info->basic_rates;
 398                 p54_setup_mac(priv);
 399                 if (priv->fw_var >= 0x500)
 400                         p54_scan(priv, P54_SCAN_EXIT, 0);
 401         }
 402         if (changed & BSS_CHANGED_ASSOC) {
 403                 if (info->assoc) {
 404                         priv->aid = info->aid;
 405                         priv->wakeup_timer = info->beacon_int *
 406                                              info->dtim_period * 5;
 407                         p54_setup_mac(priv);
 408                 } else {
 409                         priv->wakeup_timer = 500;
 410                         priv->aid = 0;
 411                 }
 412         }
 413
 414         mutex_unlock(&priv->conf_mutex);
 415 }
 416
 417 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 418                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 419                        struct ieee80211_key_conf *key)
 420 {
 421         struct p54_common *priv = dev->priv;
 422         int slot, ret = 0;
 423         u8 algo = 0;
 424         u8 *addr = NULL;
 425
 426         if (modparam_nohwcrypt)
 427                 return -EOPNOTSUPP;
 428
 429         mutex_lock(&priv->conf_mutex);
 430         if (cmd == SET_KEY) {
 431                 switch (key->alg) {
 432                 case ALG_TKIP:
 433                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 434                               BR_DESC_PRIV_CAP_TKIP))) {
 435                                 ret = -EOPNOTSUPP;
 436                                 goto out_unlock;
 437                         }
 438                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 439                         algo = P54_CRYPTO_TKIPMICHAEL;
 440                         break;
 441                 case ALG_WEP:
 442                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 443                                 ret = -EOPNOTSUPP;
 444                                 goto out_unlock;
 445                         }
 446                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 447                         algo = P54_CRYPTO_WEP;
 448                         break;
 449                 case ALG_CCMP:
 450                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 451                                 ret = -EOPNOTSUPP;
 452                                 goto out_unlock;
 453                         }
 454                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 455                         algo = P54_CRYPTO_AESCCMP;
 456                         break;
 457                 default:
 458                         ret = -EOPNOTSUPP;
 459                         goto out_unlock;
 460                 }
 461                 slot = bitmap_find_free_region(priv->used_rxkeys,
 462                                                priv->rx_keycache_size, 0);
 463
 464                 if (slot < 0) {
 465                         /*
 466                          * The device supports the choosen algorithm, but the
 467                          * firmware does not provide enough key slots to store
 468                          * all of them.
 469                          * But encryption offload for outgoing frames is always
 470                          * possible, so we just pretend that the upload was
 471                          * successful and do the decryption in software.
 472                          */
 473
 474                         /* mark the key as invalid. */
 475                         key->hw_key_idx = 0xff;
 476                         goto out_unlock;
 477                 }
 478         } else {
 479                 slot = key->hw_key_idx;
 480
 481                 if (slot == 0xff) {
 482                         /* This key was not uploaded into the rx key cache. */
 483
 484                         goto out_unlock;
 485                 }
 486
 487                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 488                 algo = 0;
 489         }
 490
 491         if (sta)
 492                 addr = sta->addr;
 493
 494         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 495                              key->keylen, addr, key->key);
 496         if (ret) {
 497                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 498                 ret = -EOPNOTSUPP;
 499                 goto out_unlock;
 500         }
 501
 502         key->hw_key_idx = slot;
 503
 504 out_unlock:
 505         mutex_unlock(&priv->conf_mutex);
 506         return ret;
 507 }
 508
 509 static const struct ieee80211_ops p54_ops = {
 510         .tx                     = p54_tx_80211,
 511         .start                  = p54_start,
 512         .stop                   = p54_stop,
 513         .add_interface          = p54_add_interface,
 514         .remove_interface       = p54_remove_interface,
 515         .set_tim                = p54_set_tim,
 516         .sta_notify             = p54_sta_notify,
 517         .sta_add                = p54_sta_add_remove,
 518         .sta_remove             = p54_sta_add_remove,
 519         .set_key                = p54_set_key,
 520         .config                 = p54_config,
 521         .bss_info_changed       = p54_bss_info_changed,
 522         .configure_filter       = p54_configure_filter,
 523         .conf_tx                = p54_conf_tx,
 524         .get_stats              = p54_get_stats,
 525 };
 526
 527 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 528 {
 529         struct ieee80211_hw *dev;
 530         struct p54_common *priv;
 531
 532         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 533         if (!dev)
 534                 return NULL;
 535
 536         priv = dev->priv;
 537         priv->hw = dev;
 538         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 539         priv->basic_rate_mask = 0x15f;
 540         spin_lock_init(&priv->tx_stats_lock);
 541         skb_queue_head_init(&priv->tx_queue);
 542         skb_queue_head_init(&priv->tx_pending);
 543         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 544                      IEEE80211_HW_SIGNAL_DBM |
 545                      IEEE80211_HW_SUPPORTS_PS |
 546                      IEEE80211_HW_PS_NULLFUNC_STACK |
 547                      IEEE80211_HW_BEACON_FILTER |
 548                      IEEE80211_HW_NOISE_DBM;
 549
 550         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 551                                       BIT(NL80211_IFTYPE_ADHOC) |
 552                                       BIT(NL80211_IFTYPE_AP) |
 553                                       BIT(NL80211_IFTYPE_MESH_POINT);
 554
 555         dev->channel_change_time = 1000;        /* TODO: find actual value */
 556         priv->beacon_req_id = cpu_to_le32(0);
 557         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 558         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 559         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 560         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 561         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 562         dev->queues = 1;
 563         priv->noise = -94;
 564         /*
 565          * We support at most 8 tries no matter which rate they're at,
 566          * we cannot support max_rates * max_rate_tries as we set it
 567          * here, but setting it correctly to 4/2 or so would limit us
 568          * artificially if the RC algorithm wants just two rates, so
 569          * let's say 4/7, we'll redistribute it at TX time, see the
 570          * comments there.
 571          */
 572         dev->max_rates = 4;
 573         dev->max_rate_tries = 7;
 574         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 575                                  sizeof(struct p54_tx_data);
 576
 577         /*
 578          * For now, disable PS by default because it affects
 579          * link stability significantly.
 580          */
 581         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 582
 583         mutex_init(&priv->conf_mutex);
 584         mutex_init(&priv->eeprom_mutex);
 585         init_completion(&priv->eeprom_comp);
 586         init_completion(&priv->beacon_comp);
 587         INIT_DELAYED_WORK(&priv->work, p54_work);
 588
 589         return dev;
 590 }
 591 EXPORT_SYMBOL_GPL(p54_init_common);
 592
 593 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 594 {
 595         struct p54_common *priv = dev->priv;
 596         int err;
 597
 598         err = ieee80211_register_hw(dev);
 599         if (err) {
 600                 dev_err(pdev, "Cannot register device (%d).\n", err);
 601                 return err;
 602         }
 603
 604 #ifdef CONFIG_P54_LEDS
 605         err = p54_init_leds(priv);
 606         if (err)
 607                 return err;
 608 #endif /* CONFIG_P54_LEDS */
 609
 610         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 611         return 0;
 612 }
 613 EXPORT_SYMBOL_GPL(p54_register_common);
 614
 615 void p54_free_common(struct ieee80211_hw *dev)
 616 {
 617         struct p54_common *priv = dev->priv;
 618         unsigned int i;
 619
 620         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
 621                 kfree(priv->band_table[i]);
 622
 623         kfree(priv->iq_autocal);
 624         kfree(priv->output_limit);
 625         kfree(priv->curve_data);
 626         kfree(priv->used_rxkeys);
 627         priv->iq_autocal = NULL;
 628         priv->output_limit = NULL;
 629         priv->curve_data = NULL;
 630         priv->used_rxkeys = NULL;
 631         ieee80211_free_hw(dev);
 632 }
 633 EXPORT_SYMBOL_GPL(p54_free_common);
 634
 635 void p54_unregister_common(struct ieee80211_hw *dev)
 636 {
 637         struct p54_common *priv = dev->priv;
 638
 639 #ifdef CONFIG_P54_LEDS
 640         p54_unregister_leds(priv);
 641 #endif /* CONFIG_P54_LEDS */
 642
 643         ieee80211_unregister_hw(dev);
 644         mutex_destroy(&priv->conf_mutex);
 645         mutex_destroy(&priv->eeprom_mutex);
 646 }
 647 EXPORT_SYMBOL_GPL(p54_unregister_common);