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_do_scan_abort(struct iwl_priv *priv)
 110 {
 111         int ret;
 112
 113         lockdep_assert_held(&priv->mutex);
 114
 115         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 116                 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
 117                 return;
 118         }
 119
 120         if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 121                 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
 122                 return;
 123         }
 124
 125         ret = iwl_send_scan_abort(priv);
 126         if (ret) {
 127                 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
 128                 clear_bit(STATUS_SCANNING, &priv->status);
 129                 clear_bit(STATUS_SCAN_HW, &priv->status);
 130                 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 131                 iwl_complete_scan(priv, true);
 132         } else
 133                 IWL_DEBUG_SCAN(priv, "Sucessfully send scan abort\n");
 134 }
 135
 136 /**
 137  * iwl_scan_cancel - Cancel any currently executing HW scan
 138  */
 139 int iwl_scan_cancel(struct iwl_priv *priv)
 140 {
 141         IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
 142         queue_work(priv->workqueue, &priv->abort_scan);
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(iwl_scan_cancel);
 146
 147 /**
 148  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
 149  * @ms: amount of time to wait (in milliseconds) for scan to abort
 150  *
 151  */
 152 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
 153 {
 154         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
 155
 156         lockdep_assert_held(&priv->mutex);
 157
 158         IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
 159
 160         iwl_do_scan_abort(priv);
 161
 162         while (time_before_eq(jiffies, timeout)) {
 163                 if (!test_bit(STATUS_SCAN_HW, &priv->status))
 164                         break;
 165                 msleep(20);
 166         }
 167
 168         return test_bit(STATUS_SCAN_HW, &priv->status);
 169 }
 170 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
 171
 172 /* Service response to REPLY_SCAN_CMD (0x80) */
 173 static void iwl_rx_reply_scan(struct iwl_priv *priv,
 174                               struct iwl_rx_mem_buffer *rxb)
 175 {
 176 #ifdef CONFIG_IWLWIFI_DEBUG
 177         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 178         struct iwl_scanreq_notification *notif =
 179             (struct iwl_scanreq_notification *)pkt->u.raw;
 180
 181         IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
 182 #endif
 183 }
 184
 185 /* Service SCAN_START_NOTIFICATION (0x82) */
 186 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
 187                                     struct iwl_rx_mem_buffer *rxb)
 188 {
 189         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 190         struct iwl_scanstart_notification *notif =
 191             (struct iwl_scanstart_notification *)pkt->u.raw;
 192         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
 193         IWL_DEBUG_SCAN(priv, "Scan start: "
 194                        "%d [802.11%s] "
 195                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
 196                        notif->channel,
 197                        notif->band ? "bg" : "a",
 198                        le32_to_cpu(notif->tsf_high),
 199                        le32_to_cpu(notif->tsf_low),
 200                        notif->status, notif->beacon_timer);
 201 }
 202
 203 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
 204 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
 205                                       struct iwl_rx_mem_buffer *rxb)
 206 {
 207 #ifdef CONFIG_IWLWIFI_DEBUG
 208         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 209         struct iwl_scanresults_notification *notif =
 210             (struct iwl_scanresults_notification *)pkt->u.raw;
 211
 212         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
 213                        "%d [802.11%s] "
 214                        "(TSF: 0x%08X:%08X) - %d "
 215                        "elapsed=%lu usec\n",
 216                        notif->channel,
 217                        notif->band ? "bg" : "a",
 218                        le32_to_cpu(notif->tsf_high),
 219                        le32_to_cpu(notif->tsf_low),
 220                        le32_to_cpu(notif->statistics[0]),
 221                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
 222 #endif
 223 }
 224
 225 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
 226 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
 227                                        struct iwl_rx_mem_buffer *rxb)
 228 {
 229         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 230         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
 231
 232         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
 233                        scan_notif->scanned_channels,
 234                        scan_notif->tsf_low,
 235                        scan_notif->tsf_high, scan_notif->status);
 236
 237         /* The HW is no longer scanning */
 238         clear_bit(STATUS_SCAN_HW, &priv->status);
 239
 240         IWL_DEBUG_INFO(priv, "Scan on %sGHz took %dms\n",
 241                        (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
 242                        jiffies_to_msecs(elapsed_jiffies
 243                                         (priv->scan_start, jiffies)));
 244
 245         queue_work(priv->workqueue, &priv->scan_completed);
 246
 247         if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
 248             priv->cfg->advanced_bt_coexist &&
 249             priv->bt_status != scan_notif->bt_status) {
 250                 if (scan_notif->bt_status) {
 251                         /* BT on */
 252                         if (!priv->bt_ch_announce)
 253                                 priv->bt_traffic_load =
 254                                         IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
 255                         /*
 256                          * otherwise, no traffic load information provided
 257                          * no changes made
 258                          */
 259                 } else {
 260                         /* BT off */
 261                         priv->bt_traffic_load =
 262                                 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
 263                 }
 264                 priv->bt_status = scan_notif->bt_status;
 265                 queue_work(priv->workqueue, &priv->bt_traffic_change_work);
 266         }
 267 }
 268
 269 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
 270 {
 271         /* scan handlers */
 272         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
 273         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
 274         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
 275                                         iwl_rx_scan_results_notif;
 276         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
 277                                         iwl_rx_scan_complete_notif;
 278 }
 279 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
 280
 281 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
 282                                      enum ieee80211_band band,
 283                                      u8 n_probes)
 284 {
 285         if (band == IEEE80211_BAND_5GHZ)
 286                 return IWL_ACTIVE_DWELL_TIME_52 +
 287                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
 288         else
 289                 return IWL_ACTIVE_DWELL_TIME_24 +
 290                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
 291 }
 292 EXPORT_SYMBOL(iwl_get_active_dwell_time);
 293
 294 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
 295                                enum ieee80211_band band,
 296                                struct ieee80211_vif *vif)
 297 {
 298         struct iwl_rxon_context *ctx;
 299         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
 300             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
 301             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
 302
 303         if (iwl_is_any_associated(priv)) {
 304                 /*
 305                  * If we're associated, we clamp the maximum passive
 306                  * dwell time to be 98% of the smallest beacon interval
 307                  * (minus 2 * channel tune time)
 308                  */
 309                 for_each_context(priv, ctx) {
 310                         u16 value;
 311
 312                         if (!iwl_is_associated_ctx(ctx))
 313                                 continue;
 314                         value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
 315                         if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
 316                                 value = IWL_PASSIVE_DWELL_BASE;
 317                         value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
 318                         passive = min(value, passive);
 319                 }
 320         }
 321
 322         return passive;
 323 }
 324 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
 325
 326 void iwl_init_scan_params(struct iwl_priv *priv)
 327 {
 328         u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
 329         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
 330                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
 331         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
 332                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
 333 }
 334 EXPORT_SYMBOL(iwl_init_scan_params);
 335
 336 static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
 337                                           struct ieee80211_vif *vif,
 338                                           bool internal,
 339                                           enum nl80211_band band)
 340 {
 341         int ret;
 342
 343         lockdep_assert_held(&priv->mutex);
 344
 345         if (WARN_ON(!priv->cfg->ops->utils->request_scan))
 346                 return -EOPNOTSUPP;
 347
 348         cancel_delayed_work(&priv->scan_check);
 349
 350         if (!iwl_is_ready(priv)) {
 351                 IWL_WARN(priv, "request scan called when driver not ready.\n");
 352                 return -EIO;
 353         }
 354
 355         if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 356                 IWL_DEBUG_INFO(priv,
 357                         "Multiple concurrent scan requests in parallel.\n");
 358                 return -EBUSY;
 359         }
 360
 361         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 362                 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
 363                 return -EIO;
 364         }
 365
 366         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 367                 IWL_DEBUG_HC(priv, "Scan request while abort pending.\n");
 368                 return -EBUSY;
 369         }
 370
 371         if (iwl_is_rfkill(priv)) {
 372                 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
 373                 return -EIO;
 374         }
 375
 376         if (!test_bit(STATUS_READY, &priv->status)) {
 377                 IWL_DEBUG_HC(priv, "Scan request while uninitialized.\n");
 378                 return -EBUSY;
 379         }
 380
 381         IWL_DEBUG_INFO(priv, "Starting %sscan...\n",
 382                         internal ? "internal short " : "");
 383
 384         set_bit(STATUS_SCANNING, &priv->status);
 385         priv->is_internal_short_scan = internal;
 386         priv->scan_start = jiffies;
 387         priv->scan_band = band;
 388
 389         ret = priv->cfg->ops->utils->request_scan(priv, vif);
 390         if (ret) {
 391                 clear_bit(STATUS_SCANNING, &priv->status);
 392                 priv->is_internal_short_scan = false;
 393                 return ret;
 394         }
 395
 396         queue_delayed_work(priv->workqueue, &priv->scan_check,
 397                            IWL_SCAN_CHECK_WATCHDOG);
 398
 399         return 0;
 400 }
 401
 402 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
 403                     struct ieee80211_vif *vif,
 404                     struct cfg80211_scan_request *req)
 405 {
 406         struct iwl_priv *priv = hw->priv;
 407         int ret;
 408
 409         IWL_DEBUG_MAC80211(priv, "enter\n");
 410
 411         if (req->n_channels == 0)
 412                 return -EINVAL;
 413
 414         mutex_lock(&priv->mutex);
 415
 416         if (test_bit(STATUS_SCANNING, &priv->status) &&
 417             !priv->is_internal_short_scan) {
 418                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 419                 ret = -EAGAIN;
 420                 goto out_unlock;
 421         }
 422
 423         /* mac80211 will only ask for one band at a time */
 424         priv->scan_request = req;
 425         priv->scan_vif = vif;
 426
 427         /*
 428          * If an internal scan is in progress, just set
 429          * up the scan_request as per above.
 430          */
 431         if (priv->is_internal_short_scan)
 432                 ret = 0;
 433         else
 434                 ret = iwl_scan_initiate(priv, vif, false,
 435                                         req->channels[0]->band);
 436
 437         IWL_DEBUG_MAC80211(priv, "leave\n");
 438
 439 out_unlock:
 440         mutex_unlock(&priv->mutex);
 441
 442         return ret;
 443 }
 444 EXPORT_SYMBOL(iwl_mac_hw_scan);
 445
 446 /*
 447  * internal short scan, this function should only been called while associated.
 448  * It will reset and tune the radio to prevent possible RF related problem
 449  */
 450 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
 451 {
 452         queue_work(priv->workqueue, &priv->start_internal_scan);
 453 }
 454
 455 static void iwl_bg_start_internal_scan(struct work_struct *work)
 456 {
 457         struct iwl_priv *priv =
 458                 container_of(work, struct iwl_priv, start_internal_scan);
 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         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 484                 return;
 485
 486         mutex_lock(&priv->mutex);
 487         if (test_bit(STATUS_SCANNING, &priv->status) &&
 488             !test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 489                 IWL_DEBUG_SCAN(priv, "Scan completion watchdog (%dms)\n",
 490                                jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
 491
 492                 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
 493                         iwl_send_scan_abort(priv);
 494         }
 495         mutex_unlock(&priv->mutex);
 496 }
 497
 498 /**
 499  * iwl_fill_probe_req - fill in all required fields and IE for probe request
 500  */
 501
 502 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
 503                        const u8 *ta, const u8 *ies, int ie_len, int left)
 504 {
 505         int len = 0;
 506         u8 *pos = NULL;
 507
 508         /* Make sure there is enough space for the probe request,
 509          * two mandatory IEs and the data */
 510         left -= 24;
 511         if (left < 0)
 512                 return 0;
 513
 514         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 515         memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
 516         memcpy(frame->sa, ta, ETH_ALEN);
 517         memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
 518         frame->seq_ctrl = 0;
 519
 520         len += 24;
 521
 522         /* ...next IE... */
 523         pos = &frame->u.probe_req.variable[0];
 524
 525         /* fill in our indirect SSID IE */
 526         left -= 2;
 527         if (left < 0)
 528                 return 0;
 529         *pos++ = WLAN_EID_SSID;
 530         *pos++ = 0;
 531
 532         len += 2;
 533
 534         if (WARN_ON(left < ie_len))
 535                 return len;
 536
 537         if (ies && ie_len) {
 538                 memcpy(pos, ies, ie_len);
 539                 len += ie_len;
 540         }
 541
 542         return (u16)len;
 543 }
 544 EXPORT_SYMBOL(iwl_fill_probe_req);
 545
 546 static void iwl_bg_abort_scan(struct work_struct *work)
 547 {
 548         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
 549
 550         cancel_delayed_work(&priv->scan_check);
 551
 552         mutex_lock(&priv->mutex);
 553         iwl_do_scan_abort(priv);
 554         mutex_unlock(&priv->mutex);
 555 }
 556
 557 static void iwl_bg_scan_completed(struct work_struct *work)
 558 {
 559         struct iwl_priv *priv =
 560             container_of(work, struct iwl_priv, scan_completed);
 561         bool aborted;
 562         struct iwl_rxon_context *ctx;
 563
 564         IWL_DEBUG_INFO(priv, "Completed %sscan.\n",
 565                        priv->is_internal_short_scan ? "internal short " : "");
 566
 567         cancel_delayed_work(&priv->scan_check);
 568
 569         mutex_lock(&priv->mutex);
 570
 571         aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 572         if (aborted)
 573                 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
 574
 575         if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
 576                 IWL_DEBUG_INFO(priv, "Scan already completed.\n");
 577                 goto out;
 578         }
 579
 580         if (priv->is_internal_short_scan && !aborted) {
 581                 int err;
 582
 583                 /* Check if mac80211 requested scan during our internal scan */
 584                 if (priv->scan_request == NULL)
 585                         goto out_complete;
 586
 587                 /* If so request a new scan */
 588                 err = iwl_scan_initiate(priv, priv->scan_vif, false,
 589                                         priv->scan_request->channels[0]->band);
 590                 if (err) {
 591                         IWL_DEBUG_SCAN(priv,
 592                                 "failed to initiate pending scan: %d\n", err);
 593                         aborted = true;
 594                         goto out_complete;
 595                 }
 596
 597                 goto out;
 598         }
 599
 600 out_complete:
 601         iwl_complete_scan(priv, aborted);
 602
 603         /* Can we still talk to firmware ? */
 604         if (!iwl_is_ready_rf(priv))
 605                 goto out;
 606
 607         /* Since setting the TXPOWER may have been deferred while
 608          * performing the scan, fire one off */
 609         iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
 610
 611         /*
 612          * Since setting the RXON may have been deferred while
 613          * performing the scan, fire one off if needed
 614          */
 615         for_each_context(priv, ctx)
 616                 iwlcore_commit_rxon(priv, ctx);
 617
 618         if (priv->cfg->ops->hcmd->set_pan_params)
 619                 priv->cfg->ops->hcmd->set_pan_params(priv);
 620
 621  out:
 622         mutex_unlock(&priv->mutex);
 623 }
 624
 625 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
 626 {
 627         INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
 628         INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
 629         INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
 630         INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
 631 }
 632 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
 633