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_SCAN(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 void iwl_force_scan_end(struct iwl_priv *priv)
 110 {
 111         lockdep_assert_held(&priv->mutex);
 112
 113         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 114                 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
 115                 return;
 116         }
 117
 118         IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
 119         clear_bit(STATUS_SCANNING, &priv->status);
 120         clear_bit(STATUS_SCAN_HW, &priv->status);
 121         clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 122         iwl_complete_scan(priv, true);
 123 }
 124
 125 static void iwl_do_scan_abort(struct iwl_priv *priv)
 126 {
 127         int ret;
 128
 129         lockdep_assert_held(&priv->mutex);
 130
 131         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 132                 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
 133                 return;
 134         }
 135
 136         if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 137                 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
 138                 return;
 139         }
 140
 141         ret = iwl_send_scan_abort(priv);
 142         if (ret) {
 143                 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
 144                 iwl_force_scan_end(priv);
 145         } else
 146                 IWL_DEBUG_SCAN(priv, "Sucessfully send scan abort\n");
 147 }
 148
 149 /**
 150  * iwl_scan_cancel - Cancel any currently executing HW scan
 151  */
 152 int iwl_scan_cancel(struct iwl_priv *priv)
 153 {
 154         IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
 155         queue_work(priv->workqueue, &priv->abort_scan);
 156         return 0;
 157 }
 158 EXPORT_SYMBOL(iwl_scan_cancel);
 159
 160 /**
 161  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
 162  * @ms: amount of time to wait (in milliseconds) for scan to abort
 163  *
 164  */
 165 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
 166 {
 167         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
 168
 169         lockdep_assert_held(&priv->mutex);
 170
 171         IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
 172
 173         iwl_do_scan_abort(priv);
 174
 175         while (time_before_eq(jiffies, timeout)) {
 176                 if (!test_bit(STATUS_SCAN_HW, &priv->status))
 177                         break;
 178                 msleep(20);
 179         }
 180
 181         return test_bit(STATUS_SCAN_HW, &priv->status);
 182 }
 183 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
 184
 185 /* Service response to REPLY_SCAN_CMD (0x80) */
 186 static void iwl_rx_reply_scan(struct iwl_priv *priv,
 187                               struct iwl_rx_mem_buffer *rxb)
 188 {
 189 #ifdef CONFIG_IWLWIFI_DEBUG
 190         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 191         struct iwl_scanreq_notification *notif =
 192             (struct iwl_scanreq_notification *)pkt->u.raw;
 193
 194         IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
 195 #endif
 196 }
 197
 198 /* Service SCAN_START_NOTIFICATION (0x82) */
 199 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
 200                                     struct iwl_rx_mem_buffer *rxb)
 201 {
 202         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 203         struct iwl_scanstart_notification *notif =
 204             (struct iwl_scanstart_notification *)pkt->u.raw;
 205         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
 206         IWL_DEBUG_SCAN(priv, "Scan start: "
 207                        "%d [802.11%s] "
 208                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
 209                        notif->channel,
 210                        notif->band ? "bg" : "a",
 211                        le32_to_cpu(notif->tsf_high),
 212                        le32_to_cpu(notif->tsf_low),
 213                        notif->status, notif->beacon_timer);
 214 }
 215
 216 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
 217 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
 218                                       struct iwl_rx_mem_buffer *rxb)
 219 {
 220 #ifdef CONFIG_IWLWIFI_DEBUG
 221         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 222         struct iwl_scanresults_notification *notif =
 223             (struct iwl_scanresults_notification *)pkt->u.raw;
 224
 225         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
 226                        "%d [802.11%s] "
 227                        "(TSF: 0x%08X:%08X) - %d "
 228                        "elapsed=%lu usec\n",
 229                        notif->channel,
 230                        notif->band ? "bg" : "a",
 231                        le32_to_cpu(notif->tsf_high),
 232                        le32_to_cpu(notif->tsf_low),
 233                        le32_to_cpu(notif->statistics[0]),
 234                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
 235 #endif
 236 }
 237
 238 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
 239 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
 240                                        struct iwl_rx_mem_buffer *rxb)
 241 {
 242         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 243         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
 244
 245         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
 246                        scan_notif->scanned_channels,
 247                        scan_notif->tsf_low,
 248                        scan_notif->tsf_high, scan_notif->status);
 249
 250         /* The HW is no longer scanning */
 251         clear_bit(STATUS_SCAN_HW, &priv->status);
 252
 253         IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
 254                        (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
 255                        jiffies_to_msecs(jiffies - priv->scan_start));
 256
 257         queue_work(priv->workqueue, &priv->scan_completed);
 258
 259         if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
 260             iwl_advanced_bt_coexist(priv) &&
 261             priv->bt_status != scan_notif->bt_status) {
 262                 if (scan_notif->bt_status) {
 263                         /* BT on */
 264                         if (!priv->bt_ch_announce)
 265                                 priv->bt_traffic_load =
 266                                         IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
 267                         /*
 268                          * otherwise, no traffic load information provided
 269                          * no changes made
 270                          */
 271                 } else {
 272                         /* BT off */
 273                         priv->bt_traffic_load =
 274                                 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
 275                 }
 276                 priv->bt_status = scan_notif->bt_status;
 277                 queue_work(priv->workqueue, &priv->bt_traffic_change_work);
 278         }
 279 }
 280
 281 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
 282 {
 283         /* scan handlers */
 284         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
 285         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
 286         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
 287                                         iwl_rx_scan_results_notif;
 288         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
 289                                         iwl_rx_scan_complete_notif;
 290 }
 291 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
 292
 293 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
 294                                      enum ieee80211_band band,
 295                                      u8 n_probes)
 296 {
 297         if (band == IEEE80211_BAND_5GHZ)
 298                 return IWL_ACTIVE_DWELL_TIME_52 +
 299                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
 300         else
 301                 return IWL_ACTIVE_DWELL_TIME_24 +
 302                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
 303 }
 304 EXPORT_SYMBOL(iwl_get_active_dwell_time);
 305
 306 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
 307                                enum ieee80211_band band,
 308                                struct ieee80211_vif *vif)
 309 {
 310         struct iwl_rxon_context *ctx;
 311         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
 312             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
 313             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
 314
 315         if (iwl_is_any_associated(priv)) {
 316                 /*
 317                  * If we're associated, we clamp the maximum passive
 318                  * dwell time to be 98% of the smallest beacon interval
 319                  * (minus 2 * channel tune time)
 320                  */
 321                 for_each_context(priv, ctx) {
 322                         u16 value;
 323
 324                         if (!iwl_is_associated_ctx(ctx))
 325                                 continue;
 326                         value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
 327                         if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
 328                                 value = IWL_PASSIVE_DWELL_BASE;
 329                         value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
 330                         passive = min(value, passive);
 331                 }
 332         }
 333
 334         return passive;
 335 }
 336 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
 337
 338 void iwl_init_scan_params(struct iwl_priv *priv)
 339 {
 340         u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
 341         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
 342                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
 343         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
 344                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
 345 }
 346 EXPORT_SYMBOL(iwl_init_scan_params);
 347
 348 static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
 349                                           struct ieee80211_vif *vif,
 350                                           bool internal,
 351                                           enum ieee80211_band band)
 352 {
 353         int ret;
 354
 355         lockdep_assert_held(&priv->mutex);
 356
 357         if (WARN_ON(!priv->cfg->ops->utils->request_scan))
 358                 return -EOPNOTSUPP;
 359
 360         cancel_delayed_work(&priv->scan_check);
 361
 362         if (!iwl_is_ready_rf(priv)) {
 363                 IWL_WARN(priv, "Request scan called when driver not ready.\n");
 364                 return -EIO;
 365         }
 366
 367         if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 368                 IWL_DEBUG_SCAN(priv,
 369                         "Multiple concurrent scan requests in parallel.\n");
 370                 return -EBUSY;
 371         }
 372
 373         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 374                 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
 375                 return -EBUSY;
 376         }
 377
 378         IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
 379                         internal ? "internal short " : "");
 380
 381         set_bit(STATUS_SCANNING, &priv->status);
 382         priv->is_internal_short_scan = internal;
 383         priv->scan_start = jiffies;
 384         priv->scan_band = band;
 385
 386         ret = priv->cfg->ops->utils->request_scan(priv, vif);
 387         if (ret) {
 388                 clear_bit(STATUS_SCANNING, &priv->status);
 389                 priv->is_internal_short_scan = false;
 390                 return ret;
 391         }
 392
 393         queue_delayed_work(priv->workqueue, &priv->scan_check,
 394                            IWL_SCAN_CHECK_WATCHDOG);
 395
 396         return 0;
 397 }
 398
 399 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
 400                     struct ieee80211_vif *vif,
 401                     struct cfg80211_scan_request *req)
 402 {
 403         struct iwl_priv *priv = hw->priv;
 404         int ret;
 405
 406         IWL_DEBUG_MAC80211(priv, "enter\n");
 407
 408         if (req->n_channels == 0)
 409                 return -EINVAL;
 410
 411         mutex_lock(&priv->mutex);
 412
 413         if (test_bit(STATUS_SCANNING, &priv->status) &&
 414             !priv->is_internal_short_scan) {
 415                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 416                 ret = -EAGAIN;
 417                 goto out_unlock;
 418         }
 419
 420         /* mac80211 will only ask for one band at a time */
 421         priv->scan_request = req;
 422         priv->scan_vif = vif;
 423
 424         /*
 425          * If an internal scan is in progress, just set
 426          * up the scan_request as per above.
 427          */
 428         if (priv->is_internal_short_scan) {
 429                 IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
 430                 ret = 0;
 431         } else
 432                 ret = iwl_scan_initiate(priv, vif, false,
 433                                         req->channels[0]->band);
 434
 435         IWL_DEBUG_MAC80211(priv, "leave\n");
 436
 437 out_unlock:
 438         mutex_unlock(&priv->mutex);
 439
 440         return ret;
 441 }
 442 EXPORT_SYMBOL(iwl_mac_hw_scan);
 443
 444 /*
 445  * internal short scan, this function should only been called while associated.
 446  * It will reset and tune the radio to prevent possible RF related problem
 447  */
 448 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
 449 {
 450         queue_work(priv->workqueue, &priv->start_internal_scan);
 451 }
 452
 453 static void iwl_bg_start_internal_scan(struct work_struct *work)
 454 {
 455         struct iwl_priv *priv =
 456                 container_of(work, struct iwl_priv, start_internal_scan);
 457
 458         IWL_DEBUG_SCAN(priv, "Start internal scan\n");
 459
 460         mutex_lock(&priv->mutex);
 461
 462         if (priv->is_internal_short_scan == true) {
 463                 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
 464                 goto unlock;
 465         }
 466
 467         if (test_bit(STATUS_SCANNING, &priv->status)) {
 468                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 469                 goto unlock;
 470         }
 471
 472         if (iwl_scan_initiate(priv, NULL, true, priv->band))
 473                 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
 474  unlock:
 475         mutex_unlock(&priv->mutex);
 476 }
 477
 478 static void iwl_bg_scan_check(struct work_struct *data)
 479 {
 480         struct iwl_priv *priv =
 481             container_of(data, struct iwl_priv, scan_check.work);
 482
 483         IWL_DEBUG_SCAN(priv, "Scan check work\n");
 484
 485         /* Since we are here firmware does not finish scan and
 486          * most likely is in bad shape, so we don't bother to
 487          * send abort command, just force scan complete to mac80211 */
 488         mutex_lock(&priv->mutex);
 489         iwl_force_scan_end(priv);
 490         mutex_unlock(&priv->mutex);
 491 }
 492
 493 /**
 494  * iwl_fill_probe_req - fill in all required fields and IE for probe request
 495  */
 496
 497 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
 498                        const u8 *ta, const u8 *ies, int ie_len, int left)
 499 {
 500         int len = 0;
 501         u8 *pos = NULL;
 502
 503         /* Make sure there is enough space for the probe request,
 504          * two mandatory IEs and the data */
 505         left -= 24;
 506         if (left < 0)
 507                 return 0;
 508
 509         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 510         memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
 511         memcpy(frame->sa, ta, ETH_ALEN);
 512         memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
 513         frame->seq_ctrl = 0;
 514
 515         len += 24;
 516
 517         /* ...next IE... */
 518         pos = &frame->u.probe_req.variable[0];
 519
 520         /* fill in our indirect SSID IE */
 521         left -= 2;
 522         if (left < 0)
 523                 return 0;
 524         *pos++ = WLAN_EID_SSID;
 525         *pos++ = 0;
 526
 527         len += 2;
 528
 529         if (WARN_ON(left < ie_len))
 530                 return len;
 531
 532         if (ies && ie_len) {
 533                 memcpy(pos, ies, ie_len);
 534                 len += ie_len;
 535         }
 536
 537         return (u16)len;
 538 }
 539 EXPORT_SYMBOL(iwl_fill_probe_req);
 540
 541 static void iwl_bg_abort_scan(struct work_struct *work)
 542 {
 543         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
 544
 545         IWL_DEBUG_SCAN(priv, "Abort scan work\n");
 546
 547         /* We keep scan_check work queued in case when firmware will not
 548          * report back scan completed notification */
 549         mutex_lock(&priv->mutex);
 550         iwl_scan_cancel_timeout(priv, 200);
 551         mutex_unlock(&priv->mutex);
 552 }
 553
 554 static void iwl_bg_scan_completed(struct work_struct *work)
 555 {
 556         struct iwl_priv *priv =
 557             container_of(work, struct iwl_priv, scan_completed);
 558         bool aborted;
 559
 560         IWL_DEBUG_SCAN(priv, "Completed %sscan.\n",
 561                        priv->is_internal_short_scan ? "internal short " : "");
 562
 563         cancel_delayed_work(&priv->scan_check);
 564
 565         mutex_lock(&priv->mutex);
 566
 567         aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 568         if (aborted)
 569                 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
 570
 571         if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
 572                 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
 573                 goto out_settings;
 574         }
 575
 576         if (priv->is_internal_short_scan && !aborted) {
 577                 int err;
 578
 579                 /* Check if mac80211 requested scan during our internal scan */
 580                 if (priv->scan_request == NULL)
 581                         goto out_complete;
 582
 583                 /* If so request a new scan */
 584                 err = iwl_scan_initiate(priv, priv->scan_vif, false,
 585                                         priv->scan_request->channels[0]->band);
 586                 if (err) {
 587                         IWL_DEBUG_SCAN(priv,
 588                                 "failed to initiate pending scan: %d\n", err);
 589                         aborted = true;
 590                         goto out_complete;
 591                 }
 592
 593                 goto out;
 594         }
 595
 596 out_complete:
 597         iwl_complete_scan(priv, aborted);
 598
 599 out_settings:
 600         /* Can we still talk to firmware ? */
 601         if (!iwl_is_ready_rf(priv))
 602                 goto out;
 603
 604         /*
 605          * We do not commit power settings while scan is pending,
 606          * do it now if the settings changed.
 607          */
 608         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 609         iwl_set_tx_power(priv, priv->tx_power_next, false);
 610
 611         priv->cfg->ops->utils->post_scan(priv);
 612
 613 out:
 614         mutex_unlock(&priv->mutex);
 615 }
 616
 617 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
 618 {
 619         INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
 620         INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
 621         INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
 622         INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
 623 }
 624 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
 625
 626 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
 627 {
 628         cancel_work_sync(&priv->start_internal_scan);
 629         cancel_work_sync(&priv->abort_scan);
 630         cancel_work_sync(&priv->scan_completed);
 631
 632         if (cancel_delayed_work_sync(&priv->scan_check)) {
 633                 mutex_lock(&priv->mutex);
 634                 iwl_force_scan_end(priv);
 635                 mutex_unlock(&priv->mutex);
 636         }
 637 }
 638 EXPORT_SYMBOL(iwl_cancel_scan_deferred_work);