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

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 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 <[email protected]>
  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 #include "iwl-agn.h"
  40 #include "iwl-trans.h"
  41
  42 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
  43  * sending probe req.  This should be set long enough to hear probe responses
  44  * from more than one AP.  */
  45 #define IWL_ACTIVE_DWELL_TIME_24    (30)       /* all times in msec */
  46 #define IWL_ACTIVE_DWELL_TIME_52    (20)
  47
  48 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
  49 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
  50
  51 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
  52  * Must be set longer than active dwell time.
  53  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
  54 #define IWL_PASSIVE_DWELL_TIME_24   (20)       /* all times in msec */
  55 #define IWL_PASSIVE_DWELL_TIME_52   (10)
  56 #define IWL_PASSIVE_DWELL_BASE      (100)
  57 #define IWL_CHANNEL_TUNE_TIME       5
  58
  59 static int iwl_send_scan_abort(struct iwl_priv *priv)
  60 {
  61         int ret;
  62         struct iwl_rx_packet *pkt;
  63         struct iwl_host_cmd cmd = {
  64                 .id = REPLY_SCAN_ABORT_CMD,
  65                 .flags = CMD_SYNC | CMD_WANT_SKB,
  66         };
  67
  68         /* Exit instantly with error when device is not ready
  69          * to receive scan abort command or it does not perform
  70          * hardware scan currently */
  71         if (!test_bit(STATUS_READY, &priv->status) ||
  72             !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
  73             !test_bit(STATUS_SCAN_HW, &priv->status) ||
  74             test_bit(STATUS_FW_ERROR, &priv->status) ||
  75             test_bit(STATUS_EXIT_PENDING, &priv->status))
  76                 return -EIO;
  77
  78         ret = trans_send_cmd(&priv->trans, &cmd);
  79         if (ret)
  80                 return ret;
  81
  82         pkt = (struct iwl_rx_packet *)cmd.reply_page;
  83         if (pkt->u.status != CAN_ABORT_STATUS) {
  84                 /* The scan abort will return 1 for success or
  85                  * 2 for "failure".  A failure condition can be
  86                  * due to simply not being in an active scan which
  87                  * can occur if we send the scan abort before we
  88                  * the microcode has notified us that a scan is
  89                  * completed. */
  90                 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
  91                 ret = -EIO;
  92         }
  93
  94         iwl_free_pages(priv, cmd.reply_page);
  95         return ret;
  96 }
  97
  98 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
  99 {
 100         /* check if scan was requested from mac80211 */
 101         if (priv->scan_request) {
 102                 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
 103                 ieee80211_scan_completed(priv->hw, aborted);
 104         }
 105
 106         if (priv->scan_type == IWL_SCAN_ROC) {
 107                 ieee80211_remain_on_channel_expired(priv->hw);
 108                 priv->hw_roc_channel = NULL;
 109                 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
 110         }
 111
 112         priv->scan_type = IWL_SCAN_NORMAL;
 113         priv->scan_vif = NULL;
 114         priv->scan_request = NULL;
 115 }
 116
 117 void iwl_force_scan_end(struct iwl_priv *priv)
 118 {
 119         lockdep_assert_held(&priv->mutex);
 120
 121         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 122                 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
 123                 return;
 124         }
 125
 126         IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
 127         clear_bit(STATUS_SCANNING, &priv->status);
 128         clear_bit(STATUS_SCAN_HW, &priv->status);
 129         clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 130         iwl_complete_scan(priv, true);
 131 }
 132
 133 static void iwl_do_scan_abort(struct iwl_priv *priv)
 134 {
 135         int ret;
 136
 137         lockdep_assert_held(&priv->mutex);
 138
 139         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 140                 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
 141                 return;
 142         }
 143
 144         if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 145                 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
 146                 return;
 147         }
 148
 149         ret = iwl_send_scan_abort(priv);
 150         if (ret) {
 151                 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
 152                 iwl_force_scan_end(priv);
 153         } else
 154                 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
 155 }
 156
 157 /**
 158  * iwl_scan_cancel - Cancel any currently executing HW scan
 159  */
 160 int iwl_scan_cancel(struct iwl_priv *priv)
 161 {
 162         IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
 163         queue_work(priv->workqueue, &priv->abort_scan);
 164         return 0;
 165 }
 166
 167 /**
 168  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
 169  * @ms: amount of time to wait (in milliseconds) for scan to abort
 170  *
 171  */
 172 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
 173 {
 174         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
 175
 176         lockdep_assert_held(&priv->mutex);
 177
 178         IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
 179
 180         iwl_do_scan_abort(priv);
 181
 182         while (time_before_eq(jiffies, timeout)) {
 183                 if (!test_bit(STATUS_SCAN_HW, &priv->status))
 184                         break;
 185                 msleep(20);
 186         }
 187
 188         return test_bit(STATUS_SCAN_HW, &priv->status);
 189 }
 190
 191 /* Service response to REPLY_SCAN_CMD (0x80) */
 192 static void iwl_rx_reply_scan(struct iwl_priv *priv,
 193                               struct iwl_rx_mem_buffer *rxb)
 194 {
 195 #ifdef CONFIG_IWLWIFI_DEBUG
 196         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 197         struct iwl_scanreq_notification *notif =
 198             (struct iwl_scanreq_notification *)pkt->u.raw;
 199
 200         IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
 201 #endif
 202 }
 203
 204 /* Service SCAN_START_NOTIFICATION (0x82) */
 205 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
 206                                     struct iwl_rx_mem_buffer *rxb)
 207 {
 208         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 209         struct iwl_scanstart_notification *notif =
 210             (struct iwl_scanstart_notification *)pkt->u.raw;
 211         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
 212         IWL_DEBUG_SCAN(priv, "Scan start: "
 213                        "%d [802.11%s] "
 214                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
 215                        notif->channel,
 216                        notif->band ? "bg" : "a",
 217                        le32_to_cpu(notif->tsf_high),
 218                        le32_to_cpu(notif->tsf_low),
 219                        notif->status, notif->beacon_timer);
 220
 221         if (priv->scan_type == IWL_SCAN_ROC)
 222                 ieee80211_ready_on_channel(priv->hw);
 223 }
 224
 225 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
 226 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
 227                                       struct iwl_rx_mem_buffer *rxb)
 228 {
 229 #ifdef CONFIG_IWLWIFI_DEBUG
 230         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 231         struct iwl_scanresults_notification *notif =
 232             (struct iwl_scanresults_notification *)pkt->u.raw;
 233
 234         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
 235                        "%d [802.11%s] "
 236                        "(TSF: 0x%08X:%08X) - %d "
 237                        "elapsed=%lu usec\n",
 238                        notif->channel,
 239                        notif->band ? "bg" : "a",
 240                        le32_to_cpu(notif->tsf_high),
 241                        le32_to_cpu(notif->tsf_low),
 242                        le32_to_cpu(notif->statistics[0]),
 243                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
 244 #endif
 245 }
 246
 247 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
 248 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
 249                                        struct iwl_rx_mem_buffer *rxb)
 250 {
 251         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 252         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
 253
 254         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
 255                        scan_notif->scanned_channels,
 256                        scan_notif->tsf_low,
 257                        scan_notif->tsf_high, scan_notif->status);
 258
 259         /* The HW is no longer scanning */
 260         clear_bit(STATUS_SCAN_HW, &priv->status);
 261
 262         IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
 263                        (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
 264                        jiffies_to_msecs(jiffies - priv->scan_start));
 265
 266         queue_work(priv->workqueue, &priv->scan_completed);
 267
 268         if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
 269             iwl_advanced_bt_coexist(priv) &&
 270             priv->bt_status != scan_notif->bt_status) {
 271                 if (scan_notif->bt_status) {
 272                         /* BT on */
 273                         if (!priv->bt_ch_announce)
 274                                 priv->bt_traffic_load =
 275                                         IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
 276                         /*
 277                          * otherwise, no traffic load information provided
 278                          * no changes made
 279                          */
 280                 } else {
 281                         /* BT off */
 282                         priv->bt_traffic_load =
 283                                 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
 284                 }
 285                 priv->bt_status = scan_notif->bt_status;
 286                 queue_work(priv->workqueue, &priv->bt_traffic_change_work);
 287         }
 288 }
 289
 290 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
 291 {
 292         /* scan handlers */
 293         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
 294         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
 295         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
 296                                         iwl_rx_scan_results_notif;
 297         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
 298                                         iwl_rx_scan_complete_notif;
 299 }
 300
 301 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
 302                                      enum ieee80211_band band,
 303                                      u8 n_probes)
 304 {
 305         if (band == IEEE80211_BAND_5GHZ)
 306                 return IWL_ACTIVE_DWELL_TIME_52 +
 307                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
 308         else
 309                 return IWL_ACTIVE_DWELL_TIME_24 +
 310                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
 311 }
 312
 313 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
 314                                enum ieee80211_band band,
 315                                struct ieee80211_vif *vif)
 316 {
 317         struct iwl_rxon_context *ctx;
 318         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
 319             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
 320             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
 321
 322         if (iwl_is_any_associated(priv)) {
 323                 /*
 324                  * If we're associated, we clamp the maximum passive
 325                  * dwell time to be 98% of the smallest beacon interval
 326                  * (minus 2 * channel tune time)
 327                  */
 328                 for_each_context(priv, ctx) {
 329                         u16 value;
 330
 331                         if (!iwl_is_associated_ctx(ctx))
 332                                 continue;
 333                         value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
 334                         if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
 335                                 value = IWL_PASSIVE_DWELL_BASE;
 336                         value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
 337                         passive = min(value, passive);
 338                 }
 339         }
 340
 341         return passive;
 342 }
 343
 344 void iwl_init_scan_params(struct iwl_priv *priv)
 345 {
 346         u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
 347         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
 348                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
 349         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
 350                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
 351 }
 352
 353 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
 354                                    struct ieee80211_vif *vif,
 355                                    enum iwl_scan_type scan_type,
 356                                    enum ieee80211_band band)
 357 {
 358         int ret;
 359
 360         lockdep_assert_held(&priv->mutex);
 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_SCAN(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_SCAN(priv, "Scan request while abort pending.\n");
 377                 return -EBUSY;
 378         }
 379
 380         IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
 381                         scan_type == IWL_SCAN_NORMAL ? "" :
 382                         scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
 383                         "internal short ");
 384
 385         set_bit(STATUS_SCANNING, &priv->status);
 386         priv->scan_type = scan_type;
 387         priv->scan_start = jiffies;
 388         priv->scan_band = band;
 389
 390         ret = iwlagn_request_scan(priv, vif);
 391         if (ret) {
 392                 clear_bit(STATUS_SCANNING, &priv->status);
 393                 priv->scan_type = IWL_SCAN_NORMAL;
 394                 return ret;
 395         }
 396
 397         queue_delayed_work(priv->workqueue, &priv->scan_check,
 398                            IWL_SCAN_CHECK_WATCHDOG);
 399
 400         return 0;
 401 }
 402
 403 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
 404                     struct ieee80211_vif *vif,
 405                     struct cfg80211_scan_request *req)
 406 {
 407         struct iwl_priv *priv = hw->priv;
 408         int ret;
 409
 410         IWL_DEBUG_MAC80211(priv, "enter\n");
 411
 412         if (req->n_channels == 0)
 413                 return -EINVAL;
 414
 415         mutex_lock(&priv->mutex);
 416
 417         if (test_bit(STATUS_SCANNING, &priv->status) &&
 418             priv->scan_type != IWL_SCAN_NORMAL) {
 419                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 420                 ret = -EAGAIN;
 421                 goto out_unlock;
 422         }
 423
 424         /* mac80211 will only ask for one band at a time */
 425         priv->scan_request = req;
 426         priv->scan_vif = vif;
 427
 428         /*
 429          * If an internal scan is in progress, just set
 430          * up the scan_request as per above.
 431          */
 432         if (priv->scan_type != IWL_SCAN_NORMAL) {
 433                 IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
 434                 ret = 0;
 435         } else
 436                 ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
 437                                         req->channels[0]->band);
 438
 439         IWL_DEBUG_MAC80211(priv, "leave\n");
 440
 441 out_unlock:
 442         mutex_unlock(&priv->mutex);
 443
 444         return ret;
 445 }
 446
 447 /*
 448  * internal short scan, this function should only been called while associated.
 449  * It will reset and tune the radio to prevent possible RF related problem
 450  */
 451 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
 452 {
 453         queue_work(priv->workqueue, &priv->start_internal_scan);
 454 }
 455
 456 static void iwl_bg_start_internal_scan(struct work_struct *work)
 457 {
 458         struct iwl_priv *priv =
 459                 container_of(work, struct iwl_priv, start_internal_scan);
 460
 461         IWL_DEBUG_SCAN(priv, "Start internal scan\n");
 462
 463         mutex_lock(&priv->mutex);
 464
 465         if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
 466                 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
 467                 goto unlock;
 468         }
 469
 470         if (test_bit(STATUS_SCANNING, &priv->status)) {
 471                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 472                 goto unlock;
 473         }
 474
 475         if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
 476                 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
 477  unlock:
 478         mutex_unlock(&priv->mutex);
 479 }
 480
 481 static void iwl_bg_scan_check(struct work_struct *data)
 482 {
 483         struct iwl_priv *priv =
 484             container_of(data, struct iwl_priv, scan_check.work);
 485
 486         IWL_DEBUG_SCAN(priv, "Scan check work\n");
 487
 488         /* Since we are here firmware does not finish scan and
 489          * most likely is in bad shape, so we don't bother to
 490          * send abort command, just force scan complete to mac80211 */
 491         mutex_lock(&priv->mutex);
 492         iwl_force_scan_end(priv);
 493         mutex_unlock(&priv->mutex);
 494 }
 495
 496 /**
 497  * iwl_fill_probe_req - fill in all required fields and IE for probe request
 498  */
 499
 500 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
 501                        const u8 *ta, const u8 *ies, int ie_len, int left)
 502 {
 503         int len = 0;
 504         u8 *pos = NULL;
 505
 506         /* Make sure there is enough space for the probe request,
 507          * two mandatory IEs and the data */
 508         left -= 24;
 509         if (left < 0)
 510                 return 0;
 511
 512         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 513         memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
 514         memcpy(frame->sa, ta, ETH_ALEN);
 515         memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
 516         frame->seq_ctrl = 0;
 517
 518         len += 24;
 519
 520         /* ...next IE... */
 521         pos = &frame->u.probe_req.variable[0];
 522
 523         /* fill in our indirect SSID IE */
 524         left -= 2;
 525         if (left < 0)
 526                 return 0;
 527         *pos++ = WLAN_EID_SSID;
 528         *pos++ = 0;
 529
 530         len += 2;
 531
 532         if (WARN_ON(left < ie_len))
 533                 return len;
 534
 535         if (ies && ie_len) {
 536                 memcpy(pos, ies, ie_len);
 537                 len += ie_len;
 538         }
 539
 540         return (u16)len;
 541 }
 542
 543 static void iwl_bg_abort_scan(struct work_struct *work)
 544 {
 545         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
 546
 547         IWL_DEBUG_SCAN(priv, "Abort scan work\n");
 548
 549         /* We keep scan_check work queued in case when firmware will not
 550          * report back scan completed notification */
 551         mutex_lock(&priv->mutex);
 552         iwl_scan_cancel_timeout(priv, 200);
 553         mutex_unlock(&priv->mutex);
 554 }
 555
 556 static void iwl_bg_scan_completed(struct work_struct *work)
 557 {
 558         struct iwl_priv *priv =
 559             container_of(work, struct iwl_priv, scan_completed);
 560         bool aborted;
 561
 562         IWL_DEBUG_SCAN(priv, "Completed scan.\n");
 563
 564         cancel_delayed_work(&priv->scan_check);
 565
 566         mutex_lock(&priv->mutex);
 567
 568         aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 569         if (aborted)
 570                 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
 571
 572         if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
 573                 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
 574                 goto out_settings;
 575         }
 576
 577         if (priv->scan_type == IWL_SCAN_ROC) {
 578                 ieee80211_remain_on_channel_expired(priv->hw);
 579                 priv->hw_roc_channel = NULL;
 580                 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
 581         }
 582
 583         if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
 584                 int err;
 585
 586                 /* Check if mac80211 requested scan during our internal scan */
 587                 if (priv->scan_request == NULL)
 588                         goto out_complete;
 589
 590                 /* If so request a new scan */
 591                 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
 592                                         priv->scan_request->channels[0]->band);
 593                 if (err) {
 594                         IWL_DEBUG_SCAN(priv,
 595                                 "failed to initiate pending scan: %d\n", err);
 596                         aborted = true;
 597                         goto out_complete;
 598                 }
 599
 600                 goto out;
 601         }
 602
 603 out_complete:
 604         iwl_complete_scan(priv, aborted);
 605
 606 out_settings:
 607         /* Can we still talk to firmware ? */
 608         if (!iwl_is_ready_rf(priv))
 609                 goto out;
 610
 611         iwlagn_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
 625 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
 626 {
 627         cancel_work_sync(&priv->start_internal_scan);
 628         cancel_work_sync(&priv->abort_scan);
 629         cancel_work_sync(&priv->scan_completed);
 630
 631         if (cancel_delayed_work_sync(&priv->scan_check)) {
 632                 mutex_lock(&priv->mutex);
 633                 iwl_force_scan_end(priv);
 634                 mutex_unlock(&priv->mutex);
 635         }
 636 }