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 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 EXPORT_SYMBOL(iwl_force_scan_end);
 125
 126 static void iwl_do_scan_abort(struct iwl_priv *priv)
 127 {
 128         int ret;
 129
 130         lockdep_assert_held(&priv->mutex);
 131
 132         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 133                 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
 134                 return;
 135         }
 136
 137         if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 138                 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
 139                 return;
 140         }
 141
 142         ret = iwl_send_scan_abort(priv);
 143         if (ret) {
 144                 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
 145                 iwl_force_scan_end(priv);
 146         } else
 147                 IWL_DEBUG_SCAN(priv, "Sucessfully send scan abort\n");
 148 }
 149
 150 /**
 151  * iwl_scan_cancel - Cancel any currently executing HW scan
 152  */
 153 int iwl_scan_cancel(struct iwl_priv *priv)
 154 {
 155         IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
 156         queue_work(priv->workqueue, &priv->abort_scan);
 157         return 0;
 158 }
 159 EXPORT_SYMBOL(iwl_scan_cancel);
 160
 161 /**
 162  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
 163  * @ms: amount of time to wait (in milliseconds) for scan to abort
 164  *
 165  */
 166 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
 167 {
 168         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
 169
 170         lockdep_assert_held(&priv->mutex);
 171
 172         IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
 173
 174         iwl_do_scan_abort(priv);
 175
 176         while (time_before_eq(jiffies, timeout)) {
 177                 if (!test_bit(STATUS_SCAN_HW, &priv->status))
 178                         break;
 179                 msleep(20);
 180         }
 181
 182         return test_bit(STATUS_SCAN_HW, &priv->status);
 183 }
 184 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
 185
 186 /* Service response to REPLY_SCAN_CMD (0x80) */
 187 static void iwl_rx_reply_scan(struct iwl_priv *priv,
 188                               struct iwl_rx_mem_buffer *rxb)
 189 {
 190 #ifdef CONFIG_IWLWIFI_DEBUG
 191         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 192         struct iwl_scanreq_notification *notif =
 193             (struct iwl_scanreq_notification *)pkt->u.raw;
 194
 195         IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
 196 #endif
 197 }
 198
 199 /* Service SCAN_START_NOTIFICATION (0x82) */
 200 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
 201                                     struct iwl_rx_mem_buffer *rxb)
 202 {
 203         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 204         struct iwl_scanstart_notification *notif =
 205             (struct iwl_scanstart_notification *)pkt->u.raw;
 206         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
 207         IWL_DEBUG_SCAN(priv, "Scan start: "
 208                        "%d [802.11%s] "
 209                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
 210                        notif->channel,
 211                        notif->band ? "bg" : "a",
 212                        le32_to_cpu(notif->tsf_high),
 213                        le32_to_cpu(notif->tsf_low),
 214                        notif->status, notif->beacon_timer);
 215 }
 216
 217 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
 218 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
 219                                       struct iwl_rx_mem_buffer *rxb)
 220 {
 221 #ifdef CONFIG_IWLWIFI_DEBUG
 222         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 223         struct iwl_scanresults_notification *notif =
 224             (struct iwl_scanresults_notification *)pkt->u.raw;
 225
 226         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
 227                        "%d [802.11%s] "
 228                        "(TSF: 0x%08X:%08X) - %d "
 229                        "elapsed=%lu usec\n",
 230                        notif->channel,
 231                        notif->band ? "bg" : "a",
 232                        le32_to_cpu(notif->tsf_high),
 233                        le32_to_cpu(notif->tsf_low),
 234                        le32_to_cpu(notif->statistics[0]),
 235                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
 236 #endif
 237 }
 238
 239 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
 240 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
 241                                        struct iwl_rx_mem_buffer *rxb)
 242 {
 243         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 244         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
 245
 246         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
 247                        scan_notif->scanned_channels,
 248                        scan_notif->tsf_low,
 249                        scan_notif->tsf_high, scan_notif->status);
 250
 251         /* The HW is no longer scanning */
 252         clear_bit(STATUS_SCAN_HW, &priv->status);
 253
 254         IWL_DEBUG_INFO(priv, "Scan on %sGHz took %dms\n",
 255                        (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
 256                        jiffies_to_msecs(elapsed_jiffies
 257                                         (priv->scan_start, jiffies)));
 258
 259         queue_work(priv->workqueue, &priv->scan_completed);
 260
 261         if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
 262             priv->cfg->advanced_bt_coexist &&
 263             priv->bt_status != scan_notif->bt_status) {
 264                 if (scan_notif->bt_status) {
 265                         /* BT on */
 266                         if (!priv->bt_ch_announce)
 267                                 priv->bt_traffic_load =
 268                                         IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
 269                         /*
 270                          * otherwise, no traffic load information provided
 271                          * no changes made
 272                          */
 273                 } else {
 274                         /* BT off */
 275                         priv->bt_traffic_load =
 276                                 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
 277                 }
 278                 priv->bt_status = scan_notif->bt_status;
 279                 queue_work(priv->workqueue, &priv->bt_traffic_change_work);
 280         }
 281 }
 282
 283 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
 284 {
 285         /* scan handlers */
 286         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
 287         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
 288         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
 289                                         iwl_rx_scan_results_notif;
 290         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
 291                                         iwl_rx_scan_complete_notif;
 292 }
 293 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
 294
 295 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
 296                                      enum ieee80211_band band,
 297                                      u8 n_probes)
 298 {
 299         if (band == IEEE80211_BAND_5GHZ)
 300                 return IWL_ACTIVE_DWELL_TIME_52 +
 301                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
 302         else
 303                 return IWL_ACTIVE_DWELL_TIME_24 +
 304                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
 305 }
 306 EXPORT_SYMBOL(iwl_get_active_dwell_time);
 307
 308 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
 309                                enum ieee80211_band band,
 310                                struct ieee80211_vif *vif)
 311 {
 312         struct iwl_rxon_context *ctx;
 313         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
 314             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
 315             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
 316
 317         if (iwl_is_any_associated(priv)) {
 318                 /*
 319                  * If we're associated, we clamp the maximum passive
 320                  * dwell time to be 98% of the smallest beacon interval
 321                  * (minus 2 * channel tune time)
 322                  */
 323                 for_each_context(priv, ctx) {
 324                         u16 value;
 325
 326                         if (!iwl_is_associated_ctx(ctx))
 327                                 continue;
 328                         value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
 329                         if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
 330                                 value = IWL_PASSIVE_DWELL_BASE;
 331                         value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
 332                         passive = min(value, passive);
 333                 }
 334         }
 335
 336         return passive;
 337 }
 338 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
 339
 340 void iwl_init_scan_params(struct iwl_priv *priv)
 341 {
 342         u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
 343         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
 344                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
 345         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
 346                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
 347 }
 348 EXPORT_SYMBOL(iwl_init_scan_params);
 349
 350 static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
 351                                           struct ieee80211_vif *vif,
 352                                           bool internal,
 353                                           enum nl80211_band band)
 354 {
 355         int ret;
 356
 357         lockdep_assert_held(&priv->mutex);
 358
 359         if (WARN_ON(!priv->cfg->ops->utils->request_scan))
 360                 return -EOPNOTSUPP;
 361
 362         cancel_delayed_work(&priv->scan_check);
 363
 364         if (!iwl_is_ready_rf(priv)) {
 365                 IWL_WARN(priv, "request scan called when driver not ready.\n");
 366                 return -EIO;
 367         }
 368
 369         if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 370                 IWL_DEBUG_INFO(priv,
 371                         "Multiple concurrent scan requests in parallel.\n");
 372                 return -EBUSY;
 373         }
 374
 375         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 376                 IWL_DEBUG_HC(priv, "Scan request while abort pending.\n");
 377                 return -EBUSY;
 378         }
 379
 380         IWL_DEBUG_INFO(priv, "Starting %sscan...\n",
 381                         internal ? "internal short " : "");
 382
 383         set_bit(STATUS_SCANNING, &priv->status);
 384         priv->is_internal_short_scan = internal;
 385         priv->scan_start = jiffies;
 386         priv->scan_band = band;
 387
 388         ret = priv->cfg->ops->utils->request_scan(priv, vif);
 389         if (ret) {
 390                 clear_bit(STATUS_SCANNING, &priv->status);
 391                 priv->is_internal_short_scan = false;
 392                 return ret;
 393         }
 394
 395         queue_delayed_work(priv->workqueue, &priv->scan_check,
 396                            IWL_SCAN_CHECK_WATCHDOG);
 397
 398         return 0;
 399 }
 400
 401 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
 402                     struct ieee80211_vif *vif,
 403                     struct cfg80211_scan_request *req)
 404 {
 405         struct iwl_priv *priv = hw->priv;
 406         int ret;
 407
 408         IWL_DEBUG_MAC80211(priv, "enter\n");
 409
 410         if (req->n_channels == 0)
 411                 return -EINVAL;
 412
 413         mutex_lock(&priv->mutex);
 414
 415         if (test_bit(STATUS_SCANNING, &priv->status) &&
 416             !priv->is_internal_short_scan) {
 417                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 418                 ret = -EAGAIN;
 419                 goto out_unlock;
 420         }
 421
 422         /* mac80211 will only ask for one band at a time */
 423         priv->scan_request = req;
 424         priv->scan_vif = vif;
 425
 426         /*
 427          * If an internal scan is in progress, just set
 428          * up the scan_request as per above.
 429          */
 430         if (priv->is_internal_short_scan)
 431                 ret = 0;
 432         else
 433                 ret = iwl_scan_initiate(priv, vif, false,
 434                                         req->channels[0]->band);
 435
 436         IWL_DEBUG_MAC80211(priv, "leave\n");
 437
 438 out_unlock:
 439         mutex_unlock(&priv->mutex);
 440
 441         return ret;
 442 }
 443 EXPORT_SYMBOL(iwl_mac_hw_scan);
 444
 445 /*
 446  * internal short scan, this function should only been called while associated.
 447  * It will reset and tune the radio to prevent possible RF related problem
 448  */
 449 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
 450 {
 451         queue_work(priv->workqueue, &priv->start_internal_scan);
 452 }
 453
 454 static void iwl_bg_start_internal_scan(struct work_struct *work)
 455 {
 456         struct iwl_priv *priv =
 457                 container_of(work, struct iwl_priv, start_internal_scan);
 458
 459         mutex_lock(&priv->mutex);
 460
 461         if (priv->is_internal_short_scan == true) {
 462                 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
 463                 goto unlock;
 464         }
 465
 466         if (test_bit(STATUS_SCANNING, &priv->status)) {
 467                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 468                 goto unlock;
 469         }
 470
 471         if (iwl_scan_initiate(priv, NULL, true, priv->band))
 472                 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
 473  unlock:
 474         mutex_unlock(&priv->mutex);
 475 }
 476
 477 static void iwl_bg_scan_check(struct work_struct *data)
 478 {
 479         struct iwl_priv *priv =
 480             container_of(data, struct iwl_priv, scan_check.work);
 481
 482         /* Since we are here firmware does not finish scan and
 483          * most likely is in bad shape, so we don't bother to
 484          * send abort command, just force scan complete to mac80211 */
 485         mutex_lock(&priv->mutex);
 486         iwl_force_scan_end(priv);
 487         mutex_unlock(&priv->mutex);
 488 }
 489
 490 /**
 491  * iwl_fill_probe_req - fill in all required fields and IE for probe request
 492  */
 493
 494 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
 495                        const u8 *ta, const u8 *ies, int ie_len, int left)
 496 {
 497         int len = 0;
 498         u8 *pos = NULL;
 499
 500         /* Make sure there is enough space for the probe request,
 501          * two mandatory IEs and the data */
 502         left -= 24;
 503         if (left < 0)
 504                 return 0;
 505
 506         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 507         memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
 508         memcpy(frame->sa, ta, ETH_ALEN);
 509         memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
 510         frame->seq_ctrl = 0;
 511
 512         len += 24;
 513
 514         /* ...next IE... */
 515         pos = &frame->u.probe_req.variable[0];
 516
 517         /* fill in our indirect SSID IE */
 518         left -= 2;
 519         if (left < 0)
 520                 return 0;
 521         *pos++ = WLAN_EID_SSID;
 522         *pos++ = 0;
 523
 524         len += 2;
 525
 526         if (WARN_ON(left < ie_len))
 527                 return len;
 528
 529         if (ies && ie_len) {
 530                 memcpy(pos, ies, ie_len);
 531                 len += ie_len;
 532         }
 533
 534         return (u16)len;
 535 }
 536 EXPORT_SYMBOL(iwl_fill_probe_req);
 537
 538 static void iwl_bg_abort_scan(struct work_struct *work)
 539 {
 540         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
 541
 542         /* We keep scan_check work queued in case when firmware will not
 543          * report back scan completed notification */
 544         mutex_lock(&priv->mutex);
 545         iwl_scan_cancel_timeout(priv, 200);
 546         mutex_unlock(&priv->mutex);
 547 }
 548
 549 static void iwl_bg_scan_completed(struct work_struct *work)
 550 {
 551         struct iwl_priv *priv =
 552             container_of(work, struct iwl_priv, scan_completed);
 553         bool aborted;
 554         struct iwl_rxon_context *ctx;
 555
 556         IWL_DEBUG_INFO(priv, "Completed %sscan.\n",
 557                        priv->is_internal_short_scan ? "internal short " : "");
 558
 559         cancel_delayed_work(&priv->scan_check);
 560
 561         mutex_lock(&priv->mutex);
 562
 563         aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 564         if (aborted)
 565                 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
 566
 567         if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
 568                 IWL_DEBUG_INFO(priv, "Scan already completed.\n");
 569                 goto out;
 570         }
 571
 572         if (priv->is_internal_short_scan && !aborted) {
 573                 int err;
 574
 575                 /* Check if mac80211 requested scan during our internal scan */
 576                 if (priv->scan_request == NULL)
 577                         goto out_complete;
 578
 579                 /* If so request a new scan */
 580                 err = iwl_scan_initiate(priv, priv->scan_vif, false,
 581                                         priv->scan_request->channels[0]->band);
 582                 if (err) {
 583                         IWL_DEBUG_SCAN(priv,
 584                                 "failed to initiate pending scan: %d\n", err);
 585                         aborted = true;
 586                         goto out_complete;
 587                 }
 588
 589                 goto out;
 590         }
 591
 592 out_complete:
 593         iwl_complete_scan(priv, aborted);
 594
 595         /* Can we still talk to firmware ? */
 596         if (!iwl_is_ready_rf(priv))
 597                 goto out;
 598
 599         /* Since setting the TXPOWER may have been deferred while
 600          * performing the scan, fire one off */
 601         iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
 602
 603         /*
 604          * Since setting the RXON may have been deferred while
 605          * performing the scan, fire one off if needed
 606          */
 607         for_each_context(priv, ctx)
 608                 iwlcore_commit_rxon(priv, ctx);
 609
 610         if (priv->cfg->ops->hcmd->set_pan_params)
 611                 priv->cfg->ops->hcmd->set_pan_params(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);