drivers/net/wireless/iwlwifi/iwl-scan.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28 #include <linux/slab.h>
  29 #include <linux/types.h>
  30 #include <linux/etherdevice.h>
  31 #include <net/mac80211.h>
  32
  33 #include "iwl-eeprom.h"
  34 #include "iwl-dev.h"
  35 #include "iwl-core.h"
  36 #include "iwl-sta.h"
  37 #include "iwl-io.h"
  38 #include "iwl-helpers.h"
  39
  40 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
  41  * sending probe req.  This should be set long enough to hear probe responses
  42  * from more than one AP.  */
  43 #define IWL_ACTIVE_DWELL_TIME_24    (30)       /* all times in msec */
  44 #define IWL_ACTIVE_DWELL_TIME_52    (20)
  45
  46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
  47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
  48
  49 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
  50  * Must be set longer than active dwell time.
  51  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
  52 #define IWL_PASSIVE_DWELL_TIME_24   (20)       /* all times in msec */
  53 #define IWL_PASSIVE_DWELL_TIME_52   (10)
  54 #define IWL_PASSIVE_DWELL_BASE      (100)
  55 #define IWL_CHANNEL_TUNE_TIME       5
  56
  57 static int iwl_send_scan_abort(struct iwl_priv *priv)
  58 {
  59         int ret;
  60         struct iwl_rx_packet *pkt;
  61         struct iwl_host_cmd cmd = {
  62                 .id = REPLY_SCAN_ABORT_CMD,
  63                 .flags = CMD_WANT_SKB,
  64         };
  65
  66         /* Exit instantly with error when device is not ready
  67          * to receive scan abort command or it does not perform
  68          * hardware scan currently */
  69         if (!test_bit(STATUS_READY, &priv->status) ||
  70             !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
  71             !test_bit(STATUS_SCAN_HW, &priv->status) ||
  72             test_bit(STATUS_FW_ERROR, &priv->status) ||
  73             test_bit(STATUS_EXIT_PENDING, &priv->status))
  74                 return -EIO;
  75
  76         ret = iwl_send_cmd_sync(priv, &cmd);
  77         if (ret)
  78                 return ret;
  79
  80         pkt = (struct iwl_rx_packet *)cmd.reply_page;
  81         if (pkt->u.status != CAN_ABORT_STATUS) {
  82                 /* The scan abort will return 1 for success or
  83                  * 2 for "failure".  A failure condition can be
  84                  * due to simply not being in an active scan which
  85                  * can occur if we send the scan abort before we
  86                  * the microcode has notified us that a scan is
  87                  * completed. */
  88                 IWL_DEBUG_INFO(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
  89                 ret = -EIO;
  90         }
  91
  92         iwl_free_pages(priv, cmd.reply_page);
  93         return ret;
  94 }
  95
  96 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
  97 {
  98         /* check if scan was requested from mac80211 */
  99         if (priv->scan_request) {
 100                 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
 101                 ieee80211_scan_completed(priv->hw, aborted);
 102         }
 103
 104         priv->is_internal_short_scan = false;
 105         priv->scan_vif = NULL;
 106         priv->scan_request = NULL;
 107 }
 108
 109 static void iwl_force_scan_end(struct iwl_priv *priv)
 110 {
 111         IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
 112         clear_bit(STATUS_SCANNING, &priv->status);
 113         clear_bit(STATUS_SCAN_HW, &priv->status);
 114         clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 115         iwl_complete_scan(priv, true);
 116 }
 117
 118 static void iwl_do_scan_abort(struct iwl_priv *priv)
 119 {
 120         int ret;
 121
 122         lockdep_assert_held(&priv->mutex);
 123
 124         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 125                 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
 126                 return;
 127         }
 128
 129         if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 130                 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
 131                 return;
 132         }
 133
 134         ret = iwl_send_scan_abort(priv);
 135         if (ret) {
 136                 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
 137                 iwl_force_scan_end(priv);
 138         } else
 139                 IWL_DEBUG_SCAN(priv, "Sucessfully send scan abort\n");
 140 }
 141
 142 /**
 143  * iwl_scan_cancel - Cancel any currently executing HW scan
 144  */
 145 int iwl_scan_cancel(struct iwl_priv *priv)
 146 {
 147         IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
 148         queue_work(priv->workqueue, &priv->abort_scan);
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(iwl_scan_cancel);
 152
 153 /**
 154  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
 155  * @ms: amount of time to wait (in milliseconds) for scan to abort
 156  *
 157  */
 158 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
 159 {
 160         int ret;
 161         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
 162
 163         lockdep_assert_held(&priv->mutex);
 164
 165         IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
 166
 167         iwl_do_scan_abort(priv);
 168
 169         while (time_before_eq(jiffies, timeout)) {
 170                 if (!test_bit(STATUS_SCAN_HW, &priv->status))
 171                         break;
 172                 msleep(20);
 173         }
 174
 175         ret = test_bit(STATUS_SCAN_HW, &priv->status);
 176         if (ret)
 177                 iwl_force_scan_end(priv);
 178         return ret;
 179 }
 180 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
 181
 182 /* Service response to REPLY_SCAN_CMD (0x80) */
 183 static void iwl_rx_reply_scan(struct iwl_priv *priv,
 184                               struct iwl_rx_mem_buffer *rxb)
 185 {
 186 #ifdef CONFIG_IWLWIFI_DEBUG
 187         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 188         struct iwl_scanreq_notification *notif =
 189             (struct iwl_scanreq_notification *)pkt->u.raw;
 190
 191         IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
 192 #endif
 193 }
 194
 195 /* Service SCAN_START_NOTIFICATION (0x82) */
 196 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
 197                                     struct iwl_rx_mem_buffer *rxb)
 198 {
 199         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 200         struct iwl_scanstart_notification *notif =
 201             (struct iwl_scanstart_notification *)pkt->u.raw;
 202         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
 203         IWL_DEBUG_SCAN(priv, "Scan start: "
 204                        "%d [802.11%s] "
 205                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
 206                        notif->channel,
 207                        notif->band ? "bg" : "a",
 208                        le32_to_cpu(notif->tsf_high),
 209                        le32_to_cpu(notif->tsf_low),
 210                        notif->status, notif->beacon_timer);
 211 }
 212
 213 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
 214 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
 215                                       struct iwl_rx_mem_buffer *rxb)
 216 {
 217 #ifdef CONFIG_IWLWIFI_DEBUG
 218         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 219         struct iwl_scanresults_notification *notif =
 220             (struct iwl_scanresults_notification *)pkt->u.raw;
 221
 222         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
 223                        "%d [802.11%s] "
 224                        "(TSF: 0x%08X:%08X) - %d "
 225                        "elapsed=%lu usec\n",
 226                        notif->channel,
 227                        notif->band ? "bg" : "a",
 228                        le32_to_cpu(notif->tsf_high),
 229                        le32_to_cpu(notif->tsf_low),
 230                        le32_to_cpu(notif->statistics[0]),
 231                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
 232 #endif
 233 }
 234
 235 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
 236 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
 237                                        struct iwl_rx_mem_buffer *rxb)
 238 {
 239         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 240         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
 241
 242         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
 243                        scan_notif->scanned_channels,
 244                        scan_notif->tsf_low,
 245                        scan_notif->tsf_high, scan_notif->status);
 246
 247         /* The HW is no longer scanning */
 248         clear_bit(STATUS_SCAN_HW, &priv->status);
 249
 250         IWL_DEBUG_INFO(priv, "Scan on %sGHz took %dms\n",
 251                        (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
 252                        jiffies_to_msecs(elapsed_jiffies
 253                                         (priv->scan_start, jiffies)));
 254
 255         queue_work(priv->workqueue, &priv->scan_completed);
 256
 257         if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
 258             priv->cfg->advanced_bt_coexist &&
 259             priv->bt_status != scan_notif->bt_status) {
 260                 if (scan_notif->bt_status) {
 261                         /* BT on */
 262                         if (!priv->bt_ch_announce)
 263                                 priv->bt_traffic_load =
 264                                         IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
 265                         /*
 266                          * otherwise, no traffic load information provided
 267                          * no changes made
 268                          */
 269                 } else {
 270                         /* BT off */
 271                         priv->bt_traffic_load =
 272                                 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
 273                 }
 274                 priv->bt_status = scan_notif->bt_status;
 275                 queue_work(priv->workqueue, &priv->bt_traffic_change_work);
 276         }
 277 }
 278
 279 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
 280 {
 281         /* scan handlers */
 282         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
 283         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
 284         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
 285                                         iwl_rx_scan_results_notif;
 286         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
 287                                         iwl_rx_scan_complete_notif;
 288 }
 289 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
 290
 291 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
 292                                      enum ieee80211_band band,
 293                                      u8 n_probes)
 294 {
 295         if (band == IEEE80211_BAND_5GHZ)
 296                 return IWL_ACTIVE_DWELL_TIME_52 +
 297                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
 298         else
 299                 return IWL_ACTIVE_DWELL_TIME_24 +
 300                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
 301 }
 302 EXPORT_SYMBOL(iwl_get_active_dwell_time);
 303
 304 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
 305                                enum ieee80211_band band,
 306                                struct ieee80211_vif *vif)
 307 {
 308         struct iwl_rxon_context *ctx;
 309         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
 310             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
 311             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
 312
 313         if (iwl_is_any_associated(priv)) {
 314                 /*
 315                  * If we're associated, we clamp the maximum passive
 316                  * dwell time to be 98% of the smallest beacon interval
 317                  * (minus 2 * channel tune time)
 318                  */
 319                 for_each_context(priv, ctx) {
 320                         u16 value;
 321
 322                         if (!iwl_is_associated_ctx(ctx))
 323                                 continue;
 324                         value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
 325                         if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
 326                                 value = IWL_PASSIVE_DWELL_BASE;
 327                         value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
 328                         passive = min(value, passive);
 329                 }
 330         }
 331
 332         return passive;
 333 }
 334 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
 335
 336 void iwl_init_scan_params(struct iwl_priv *priv)
 337 {
 338         u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
 339         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
 340                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
 341         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
 342                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
 343 }
 344 EXPORT_SYMBOL(iwl_init_scan_params);
 345
 346 static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
 347                                           struct ieee80211_vif *vif,
 348                                           bool internal,
 349                                           enum nl80211_band band)
 350 {
 351         int ret;
 352
 353         lockdep_assert_held(&priv->mutex);
 354
 355         if (WARN_ON(!priv->cfg->ops->utils->request_scan))
 356                 return -EOPNOTSUPP;
 357
 358         cancel_delayed_work(&priv->scan_check);
 359
 360         if (!iwl_is_ready(priv)) {
 361                 IWL_WARN(priv, "request scan called when driver not ready.\n");
 362                 return -EIO;
 363         }
 364
 365         if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 366                 IWL_DEBUG_INFO(priv,
 367                         "Multiple concurrent scan requests in parallel.\n");
 368                 return -EBUSY;
 369         }
 370
 371         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 372                 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
 373                 return -EIO;
 374         }
 375
 376         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 377                 IWL_DEBUG_HC(priv, "Scan request while abort pending.\n");
 378                 return -EBUSY;
 379         }
 380
 381         if (iwl_is_rfkill(priv)) {
 382                 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
 383                 return -EIO;
 384         }
 385
 386         if (!test_bit(STATUS_READY, &priv->status)) {
 387                 IWL_DEBUG_HC(priv, "Scan request while uninitialized.\n");
 388                 return -EBUSY;
 389         }
 390
 391         IWL_DEBUG_INFO(priv, "Starting %sscan...\n",
 392                         internal ? "internal short " : "");
 393
 394         set_bit(STATUS_SCANNING, &priv->status);
 395         priv->is_internal_short_scan = internal;
 396         priv->scan_start = jiffies;
 397         priv->scan_band = band;
 398
 399         ret = priv->cfg->ops->utils->request_scan(priv, vif);
 400         if (ret) {
 401                 clear_bit(STATUS_SCANNING, &priv->status);
 402                 priv->is_internal_short_scan = false;
 403                 return ret;
 404         }
 405
 406         queue_delayed_work(priv->workqueue, &priv->scan_check,
 407                            IWL_SCAN_CHECK_WATCHDOG);
 408
 409         return 0;
 410 }
 411
 412 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
 413                     struct ieee80211_vif *vif,
 414                     struct cfg80211_scan_request *req)
 415 {
 416         struct iwl_priv *priv = hw->priv;
 417         int ret;
 418
 419         IWL_DEBUG_MAC80211(priv, "enter\n");
 420
 421         if (req->n_channels == 0)
 422                 return -EINVAL;
 423
 424         mutex_lock(&priv->mutex);
 425
 426         if (test_bit(STATUS_SCANNING, &priv->status) &&
 427             !priv->is_internal_short_scan) {
 428                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 429                 ret = -EAGAIN;
 430                 goto out_unlock;
 431         }
 432
 433         /* mac80211 will only ask for one band at a time */
 434         priv->scan_request = req;
 435         priv->scan_vif = vif;
 436
 437         /*
 438          * If an internal scan is in progress, just set
 439          * up the scan_request as per above.
 440          */
 441         if (priv->is_internal_short_scan)
 442                 ret = 0;
 443         else
 444                 ret = iwl_scan_initiate(priv, vif, false,
 445                                         req->channels[0]->band);
 446
 447         IWL_DEBUG_MAC80211(priv, "leave\n");
 448
 449 out_unlock:
 450         mutex_unlock(&priv->mutex);
 451
 452         return ret;
 453 }
 454 EXPORT_SYMBOL(iwl_mac_hw_scan);
 455
 456 /*
 457  * internal short scan, this function should only been called while associated.
 458  * It will reset and tune the radio to prevent possible RF related problem
 459  */
 460 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
 461 {
 462         queue_work(priv->workqueue, &priv->start_internal_scan);
 463 }
 464
 465 static void iwl_bg_start_internal_scan(struct work_struct *work)
 466 {
 467         struct iwl_priv *priv =
 468                 container_of(work, struct iwl_priv, start_internal_scan);
 469
 470         mutex_lock(&priv->mutex);
 471
 472         if (priv->is_internal_short_scan == true) {
 473                 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
 474                 goto unlock;
 475         }
 476
 477         if (test_bit(STATUS_SCANNING, &priv->status)) {
 478                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 479                 goto unlock;
 480         }
 481
 482         if (iwl_scan_initiate(priv, NULL, true, priv->band))
 483                 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
 484  unlock:
 485         mutex_unlock(&priv->mutex);
 486 }
 487
 488 static void iwl_bg_scan_check(struct work_struct *data)
 489 {
 490         struct iwl_priv *priv =
 491             container_of(data, struct iwl_priv, scan_check.work);
 492
 493         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 494                 return;
 495
 496         mutex_lock(&priv->mutex);
 497         if (test_bit(STATUS_SCANNING, &priv->status) &&
 498             !test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 499                 IWL_DEBUG_SCAN(priv, "Scan completion watchdog (%dms)\n",
 500                                jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
 501
 502                 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
 503                         iwl_send_scan_abort(priv);
 504         }
 505         mutex_unlock(&priv->mutex);
 506 }
 507
 508 /**
 509  * iwl_fill_probe_req - fill in all required fields and IE for probe request
 510  */
 511
 512 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
 513                        const u8 *ta, const u8 *ies, int ie_len, int left)
 514 {
 515         int len = 0;
 516         u8 *pos = NULL;
 517
 518         /* Make sure there is enough space for the probe request,
 519          * two mandatory IEs and the data */
 520         left -= 24;
 521         if (left < 0)
 522                 return 0;
 523
 524         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 525         memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
 526         memcpy(frame->sa, ta, ETH_ALEN);
 527         memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
 528         frame->seq_ctrl = 0;
 529
 530         len += 24;
 531
 532         /* ...next IE... */
 533         pos = &frame->u.probe_req.variable[0];
 534
 535         /* fill in our indirect SSID IE */
 536         left -= 2;
 537         if (left < 0)
 538                 return 0;
 539         *pos++ = WLAN_EID_SSID;
 540         *pos++ = 0;
 541
 542         len += 2;
 543
 544         if (WARN_ON(left < ie_len))
 545                 return len;
 546
 547         if (ies && ie_len) {
 548                 memcpy(pos, ies, ie_len);
 549                 len += ie_len;
 550         }
 551
 552         return (u16)len;
 553 }
 554 EXPORT_SYMBOL(iwl_fill_probe_req);
 555
 556 static void iwl_bg_abort_scan(struct work_struct *work)
 557 {
 558         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
 559
 560         cancel_delayed_work(&priv->scan_check);
 561
 562         mutex_lock(&priv->mutex);
 563         iwl_do_scan_abort(priv);
 564         mutex_unlock(&priv->mutex);
 565 }
 566
 567 static void iwl_bg_scan_completed(struct work_struct *work)
 568 {
 569         struct iwl_priv *priv =
 570             container_of(work, struct iwl_priv, scan_completed);
 571         bool aborted;
 572         struct iwl_rxon_context *ctx;
 573
 574         IWL_DEBUG_INFO(priv, "Completed %sscan.\n",
 575                        priv->is_internal_short_scan ? "internal short " : "");
 576
 577         cancel_delayed_work(&priv->scan_check);
 578
 579         mutex_lock(&priv->mutex);
 580
 581         aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 582         if (aborted)
 583                 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
 584
 585         if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
 586                 IWL_DEBUG_INFO(priv, "Scan already completed.\n");
 587                 goto out;
 588         }
 589
 590         if (priv->is_internal_short_scan && !aborted) {
 591                 int err;
 592
 593                 /* Check if mac80211 requested scan during our internal scan */
 594                 if (priv->scan_request == NULL)
 595                         goto out_complete;
 596
 597                 /* If so request a new scan */
 598                 err = iwl_scan_initiate(priv, priv->scan_vif, false,
 599                                         priv->scan_request->channels[0]->band);
 600                 if (err) {
 601                         IWL_DEBUG_SCAN(priv,
 602                                 "failed to initiate pending scan: %d\n", err);
 603                         aborted = true;
 604                         goto out_complete;
 605                 }
 606
 607                 goto out;
 608         }
 609
 610 out_complete:
 611         iwl_complete_scan(priv, aborted);
 612
 613         /* Can we still talk to firmware ? */
 614         if (!iwl_is_ready_rf(priv))
 615                 goto out;
 616
 617         /* Since setting the TXPOWER may have been deferred while
 618          * performing the scan, fire one off */
 619         iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
 620
 621         /*
 622          * Since setting the RXON may have been deferred while
 623          * performing the scan, fire one off if needed
 624          */
 625         for_each_context(priv, ctx)
 626                 iwlcore_commit_rxon(priv, ctx);
 627
 628         if (priv->cfg->ops->hcmd->set_pan_params)
 629                 priv->cfg->ops->hcmd->set_pan_params(priv);
 630
 631  out:
 632         mutex_unlock(&priv->mutex);
 633 }
 634
 635 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
 636 {
 637         INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
 638         INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
 639         INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
 640         INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
 641 }
 642 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
 643