drivers/net/wireless/iwlwifi/dvm/scan.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2012 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 "dev.h"
  34 #include "agn.h"
  35
  36 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
  37  * sending probe req.  This should be set long enough to hear probe responses
  38  * from more than one AP.  */
  39 #define IWL_ACTIVE_DWELL_TIME_24    (30)       /* all times in msec */
  40 #define IWL_ACTIVE_DWELL_TIME_52    (20)
  41
  42 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
  43 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
  44
  45 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
  46  * Must be set longer than active dwell time.
  47  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
  48 #define IWL_PASSIVE_DWELL_TIME_24   (20)       /* all times in msec */
  49 #define IWL_PASSIVE_DWELL_TIME_52   (10)
  50 #define IWL_PASSIVE_DWELL_BASE      (100)
  51 #define IWL_CHANNEL_TUNE_TIME       5
  52 #define MAX_SCAN_CHANNEL            50
  53
  54 /* For reset radio, need minimal dwell time only */
  55 #define IWL_RADIO_RESET_DWELL_TIME      5
  56
  57 static int iwl_send_scan_abort(struct iwl_priv *priv)
  58 {
  59         int ret;
  60         struct iwl_host_cmd cmd = {
  61                 .id = REPLY_SCAN_ABORT_CMD,
  62                 .flags = CMD_SYNC | CMD_WANT_SKB,
  63         };
  64         __le32 *status;
  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_SCAN_HW, &priv->status) ||
  71             test_bit(STATUS_FW_ERROR, &priv->status))
  72                 return -EIO;
  73
  74         ret = iwl_dvm_send_cmd(priv, &cmd);
  75         if (ret)
  76                 return ret;
  77
  78         status = (void *)cmd.resp_pkt->data;
  79         if (*status != CAN_ABORT_STATUS) {
  80                 /* The scan abort will return 1 for success or
  81                  * 2 for "failure".  A failure condition can be
  82                  * due to simply not being in an active scan which
  83                  * can occur if we send the scan abort before we
  84                  * the microcode has notified us that a scan is
  85                  * completed. */
  86                 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n",
  87                                le32_to_cpu(*status));
  88                 ret = -EIO;
  89         }
  90
  91         iwl_free_resp(&cmd);
  92         return ret;
  93 }
  94
  95 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
  96 {
  97         /* check if scan was requested from mac80211 */
  98         if (priv->scan_request) {
  99                 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
 100                 ieee80211_scan_completed(priv->hw, aborted);
 101         }
 102
 103         if (priv->scan_type == IWL_SCAN_ROC)
 104                 iwl_scan_roc_expired(priv);
 105
 106         priv->scan_type = IWL_SCAN_NORMAL;
 107         priv->scan_vif = NULL;
 108         priv->scan_request = NULL;
 109 }
 110
 111 static void iwl_process_scan_complete(struct iwl_priv *priv)
 112 {
 113         bool aborted;
 114
 115         lockdep_assert_held(&priv->mutex);
 116
 117         if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
 118                 return;
 119
 120         IWL_DEBUG_SCAN(priv, "Completed scan.\n");
 121
 122         cancel_delayed_work(&priv->scan_check);
 123
 124         aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 125         if (aborted)
 126                 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
 127
 128         if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
 129                 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
 130                 goto out_settings;
 131         }
 132
 133         if (priv->scan_type == IWL_SCAN_ROC)
 134                 iwl_scan_roc_expired(priv);
 135
 136         if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
 137                 int err;
 138
 139                 /* Check if mac80211 requested scan during our internal scan */
 140                 if (priv->scan_request == NULL)
 141                         goto out_complete;
 142
 143                 /* If so request a new scan */
 144                 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
 145                                         priv->scan_request->channels[0]->band);
 146                 if (err) {
 147                         IWL_DEBUG_SCAN(priv,
 148                                 "failed to initiate pending scan: %d\n", err);
 149                         aborted = true;
 150                         goto out_complete;
 151                 }
 152
 153                 return;
 154         }
 155
 156 out_complete:
 157         iwl_complete_scan(priv, aborted);
 158
 159 out_settings:
 160         /* Can we still talk to firmware ? */
 161         if (!iwl_is_ready_rf(priv))
 162                 return;
 163
 164         iwlagn_post_scan(priv);
 165 }
 166
 167 void iwl_force_scan_end(struct iwl_priv *priv)
 168 {
 169         lockdep_assert_held(&priv->mutex);
 170
 171         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 172                 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
 173                 return;
 174         }
 175
 176         IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
 177         clear_bit(STATUS_SCANNING, &priv->status);
 178         clear_bit(STATUS_SCAN_HW, &priv->status);
 179         clear_bit(STATUS_SCAN_ABORTING, &priv->status);
 180         clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
 181         iwl_complete_scan(priv, true);
 182 }
 183
 184 static void iwl_do_scan_abort(struct iwl_priv *priv)
 185 {
 186         int ret;
 187
 188         lockdep_assert_held(&priv->mutex);
 189
 190         if (!test_bit(STATUS_SCANNING, &priv->status)) {
 191                 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
 192                 return;
 193         }
 194
 195         if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 196                 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
 197                 return;
 198         }
 199
 200         ret = iwl_send_scan_abort(priv);
 201         if (ret) {
 202                 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
 203                 iwl_force_scan_end(priv);
 204         } else
 205                 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
 206 }
 207
 208 /**
 209  * iwl_scan_cancel - Cancel any currently executing HW scan
 210  */
 211 int iwl_scan_cancel(struct iwl_priv *priv)
 212 {
 213         IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
 214         queue_work(priv->workqueue, &priv->abort_scan);
 215         return 0;
 216 }
 217
 218 /**
 219  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
 220  * @ms: amount of time to wait (in milliseconds) for scan to abort
 221  *
 222  */
 223 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
 224 {
 225         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
 226
 227         lockdep_assert_held(&priv->mutex);
 228
 229         IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
 230
 231         iwl_do_scan_abort(priv);
 232
 233         while (time_before_eq(jiffies, timeout)) {
 234                 if (!test_bit(STATUS_SCAN_HW, &priv->status))
 235                         goto finished;
 236                 msleep(20);
 237         }
 238
 239         return;
 240
 241  finished:
 242         /*
 243          * Now STATUS_SCAN_HW is clear. This means that the
 244          * device finished, but the background work is going
 245          * to execute at best as soon as we release the mutex.
 246          * Since we need to be able to issue a new scan right
 247          * after this function returns, run the complete here.
 248          * The STATUS_SCAN_COMPLETE bit will then be cleared
 249          * and prevent the background work from "completing"
 250          * a possible new scan.
 251          */
 252         iwl_process_scan_complete(priv);
 253 }
 254
 255 /* Service response to REPLY_SCAN_CMD (0x80) */
 256 static int iwl_rx_reply_scan(struct iwl_priv *priv,
 257                               struct iwl_rx_cmd_buffer *rxb,
 258                               struct iwl_device_cmd *cmd)
 259 {
 260 #ifdef CONFIG_IWLWIFI_DEBUG
 261         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 262         struct iwl_scanreq_notification *notif = (void *)pkt->data;
 263
 264         IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
 265 #endif
 266         return 0;
 267 }
 268
 269 /* Service SCAN_START_NOTIFICATION (0x82) */
 270 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
 271                                     struct iwl_rx_cmd_buffer *rxb,
 272                                     struct iwl_device_cmd *cmd)
 273 {
 274         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 275         struct iwl_scanstart_notification *notif = (void *)pkt->data;
 276
 277         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
 278         IWL_DEBUG_SCAN(priv, "Scan start: "
 279                        "%d [802.11%s] "
 280                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
 281                        notif->channel,
 282                        notif->band ? "bg" : "a",
 283                        le32_to_cpu(notif->tsf_high),
 284                        le32_to_cpu(notif->tsf_low),
 285                        notif->status, notif->beacon_timer);
 286
 287         if (priv->scan_type == IWL_SCAN_ROC &&
 288             !priv->hw_roc_start_notified) {
 289                 ieee80211_ready_on_channel(priv->hw);
 290                 priv->hw_roc_start_notified = true;
 291         }
 292
 293         return 0;
 294 }
 295
 296 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
 297 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
 298                                       struct iwl_rx_cmd_buffer *rxb,
 299                                       struct iwl_device_cmd *cmd)
 300 {
 301 #ifdef CONFIG_IWLWIFI_DEBUG
 302         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 303         struct iwl_scanresults_notification *notif = (void *)pkt->data;
 304
 305         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
 306                        "%d [802.11%s] "
 307                        "probe status: %u:%u "
 308                        "(TSF: 0x%08X:%08X) - %d "
 309                        "elapsed=%lu usec\n",
 310                        notif->channel,
 311                        notif->band ? "bg" : "a",
 312                        notif->probe_status, notif->num_probe_not_sent,
 313                        le32_to_cpu(notif->tsf_high),
 314                        le32_to_cpu(notif->tsf_low),
 315                        le32_to_cpu(notif->statistics[0]),
 316                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
 317 #endif
 318         return 0;
 319 }
 320
 321 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
 322 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
 323                                        struct iwl_rx_cmd_buffer *rxb,
 324                                        struct iwl_device_cmd *cmd)
 325 {
 326         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 327         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
 328
 329         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
 330                        scan_notif->scanned_channels,
 331                        scan_notif->tsf_low,
 332                        scan_notif->tsf_high, scan_notif->status);
 333
 334         IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
 335                        (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
 336                        jiffies_to_msecs(jiffies - priv->scan_start));
 337
 338         /*
 339          * When aborting, we run the scan completed background work inline
 340          * and the background work must then do nothing. The SCAN_COMPLETE
 341          * bit helps implement that logic and thus needs to be set before
 342          * queueing the work. Also, since the scan abort waits for SCAN_HW
 343          * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
 344          * to avoid a race there.
 345          */
 346         set_bit(STATUS_SCAN_COMPLETE, &priv->status);
 347         clear_bit(STATUS_SCAN_HW, &priv->status);
 348         queue_work(priv->workqueue, &priv->scan_completed);
 349
 350         if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
 351             iwl_advanced_bt_coexist(priv) &&
 352             priv->bt_status != scan_notif->bt_status) {
 353                 if (scan_notif->bt_status) {
 354                         /* BT on */
 355                         if (!priv->bt_ch_announce)
 356                                 priv->bt_traffic_load =
 357                                         IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
 358                         /*
 359                          * otherwise, no traffic load information provided
 360                          * no changes made
 361                          */
 362                 } else {
 363                         /* BT off */
 364                         priv->bt_traffic_load =
 365                                 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
 366                 }
 367                 priv->bt_status = scan_notif->bt_status;
 368                 queue_work(priv->workqueue,
 369                            &priv->bt_traffic_change_work);
 370         }
 371         return 0;
 372 }
 373
 374 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
 375 {
 376         /* scan handlers */
 377         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
 378         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
 379         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
 380                                         iwl_rx_scan_results_notif;
 381         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
 382                                         iwl_rx_scan_complete_notif;
 383 }
 384
 385 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
 386                                      enum ieee80211_band band, u8 n_probes)
 387 {
 388         if (band == IEEE80211_BAND_5GHZ)
 389                 return IWL_ACTIVE_DWELL_TIME_52 +
 390                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
 391         else
 392                 return IWL_ACTIVE_DWELL_TIME_24 +
 393                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
 394 }
 395
 396 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
 397 {
 398         struct iwl_rxon_context *ctx;
 399         int limits[NUM_IWL_RXON_CTX] = {};
 400         int n_active = 0;
 401         u16 limit;
 402
 403         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 404
 405         /*
 406          * If we're associated, we clamp the dwell time 98%
 407          * of the beacon interval (minus 2 * channel tune time)
 408          * If both contexts are active, we have to restrict to
 409          * 1/2 of the minimum of them, because they might be in
 410          * lock-step with the time inbetween only half of what
 411          * time we'd have in each of them.
 412          */
 413         for_each_context(priv, ctx) {
 414                 switch (ctx->staging.dev_type) {
 415                 case RXON_DEV_TYPE_P2P:
 416                         /* no timing constraints */
 417                         continue;
 418                 case RXON_DEV_TYPE_ESS:
 419                 default:
 420                         /* timing constraints if associated */
 421                         if (!iwl_is_associated_ctx(ctx))
 422                                 continue;
 423                         break;
 424                 case RXON_DEV_TYPE_CP:
 425                 case RXON_DEV_TYPE_2STA:
 426                         /*
 427                          * These seem to always have timers for TBTT
 428                          * active in uCode even when not associated yet.
 429                          */
 430                         break;
 431                 }
 432
 433                 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
 434         }
 435
 436         switch (n_active) {
 437         case 0:
 438                 return dwell_time;
 439         case 2:
 440                 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
 441                 limit /= 2;
 442                 dwell_time = min(limit, dwell_time);
 443                 /* fall through to limit further */
 444         case 1:
 445                 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
 446                 limit /= n_active;
 447                 return min(limit, dwell_time);
 448         default:
 449                 WARN_ON_ONCE(1);
 450                 return dwell_time;
 451         }
 452 }
 453
 454 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
 455                                       enum ieee80211_band band)
 456 {
 457         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
 458             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
 459             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
 460
 461         return iwl_limit_dwell(priv, passive);
 462 }
 463
 464 /* Return valid, unused, channel for a passive scan to reset the RF */
 465 static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
 466                                         enum ieee80211_band band)
 467 {
 468         struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
 469         struct iwl_rxon_context *ctx;
 470         int i;
 471
 472         for (i = 0; i < sband->n_channels; i++) {
 473                 bool busy = false;
 474
 475                 for_each_context(priv, ctx) {
 476                         busy = sband->channels[i].hw_value ==
 477                                 le16_to_cpu(ctx->staging.channel);
 478                         if (busy)
 479                                 break;
 480                 }
 481
 482                 if (busy)
 483                         continue;
 484
 485                 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
 486                         return sband->channels[i].hw_value;
 487         }
 488
 489         return 0;
 490 }
 491
 492 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
 493                                           struct ieee80211_vif *vif,
 494                                           enum ieee80211_band band,
 495                                           struct iwl_scan_channel *scan_ch)
 496 {
 497         const struct ieee80211_supported_band *sband;
 498         u16 channel;
 499
 500         sband = iwl_get_hw_mode(priv, band);
 501         if (!sband) {
 502                 IWL_ERR(priv, "invalid band\n");
 503                 return 0;
 504         }
 505
 506         channel = iwl_get_single_channel_number(priv, band);
 507         if (channel) {
 508                 scan_ch->channel = cpu_to_le16(channel);
 509                 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
 510                 scan_ch->active_dwell =
 511                         cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
 512                 scan_ch->passive_dwell =
 513                         cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
 514                 /* Set txpower levels to defaults */
 515                 scan_ch->dsp_atten = 110;
 516                 if (band == IEEE80211_BAND_5GHZ)
 517                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
 518                 else
 519                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
 520                 return 1;
 521         }
 522
 523         IWL_ERR(priv, "no valid channel found\n");
 524         return 0;
 525 }
 526
 527 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
 528                                      struct ieee80211_vif *vif,
 529                                      enum ieee80211_band band,
 530                                      u8 is_active, u8 n_probes,
 531                                      struct iwl_scan_channel *scan_ch)
 532 {
 533         struct ieee80211_channel *chan;
 534         const struct ieee80211_supported_band *sband;
 535         u16 passive_dwell = 0;
 536         u16 active_dwell = 0;
 537         int added, i;
 538         u16 channel;
 539
 540         sband = iwl_get_hw_mode(priv, band);
 541         if (!sband)
 542                 return 0;
 543
 544         active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
 545         passive_dwell = iwl_get_passive_dwell_time(priv, band);
 546
 547         if (passive_dwell <= active_dwell)
 548                 passive_dwell = active_dwell + 1;
 549
 550         for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
 551                 chan = priv->scan_request->channels[i];
 552
 553                 if (chan->band != band)
 554                         continue;
 555
 556                 channel = chan->hw_value;
 557                 scan_ch->channel = cpu_to_le16(channel);
 558
 559                 if (!is_active || (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
 560                         scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
 561                 else
 562                         scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
 563
 564                 if (n_probes)
 565                         scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
 566
 567                 scan_ch->active_dwell = cpu_to_le16(active_dwell);
 568                 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
 569
 570                 /* Set txpower levels to defaults */
 571                 scan_ch->dsp_atten = 110;
 572
 573                 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
 574                  * power level:
 575                  * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
 576                  */
 577                 if (band == IEEE80211_BAND_5GHZ)
 578                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
 579                 else
 580                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
 581
 582                 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
 583                                channel, le32_to_cpu(scan_ch->type),
 584                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
 585                                 "ACTIVE" : "PASSIVE",
 586                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
 587                                active_dwell : passive_dwell);
 588
 589                 scan_ch++;
 590                 added++;
 591         }
 592
 593         IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
 594         return added;
 595 }
 596
 597 /**
 598  * iwl_fill_probe_req - fill in all required fields and IE for probe request
 599  */
 600
 601 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
 602                               const u8 *ies, int ie_len, const u8 *ssid,
 603                               u8 ssid_len, int left)
 604 {
 605         int len = 0;
 606         u8 *pos = NULL;
 607
 608         /* Make sure there is enough space for the probe request,
 609          * two mandatory IEs and the data */
 610         left -= 24;
 611         if (left < 0)
 612                 return 0;
 613
 614         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 615         eth_broadcast_addr(frame->da);
 616         memcpy(frame->sa, ta, ETH_ALEN);
 617         eth_broadcast_addr(frame->bssid);
 618         frame->seq_ctrl = 0;
 619
 620         len += 24;
 621
 622         /* ...next IE... */
 623         pos = &frame->u.probe_req.variable[0];
 624
 625         /* fill in our SSID IE */
 626         left -= ssid_len + 2;
 627         if (left < 0)
 628                 return 0;
 629         *pos++ = WLAN_EID_SSID;
 630         *pos++ = ssid_len;
 631         if (ssid && ssid_len) {
 632                 memcpy(pos, ssid, ssid_len);
 633                 pos += ssid_len;
 634         }
 635
 636         len += ssid_len + 2;
 637
 638         if (WARN_ON(left < ie_len))
 639                 return len;
 640
 641         if (ies && ie_len) {
 642                 memcpy(pos, ies, ie_len);
 643                 len += ie_len;
 644         }
 645
 646         return (u16)len;
 647 }
 648
 649 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
 650 {
 651         struct iwl_host_cmd cmd = {
 652                 .id = REPLY_SCAN_CMD,
 653                 .len = { sizeof(struct iwl_scan_cmd), },
 654                 .flags = CMD_SYNC,
 655         };
 656         struct iwl_scan_cmd *scan;
 657         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 658         u32 rate_flags = 0;
 659         u16 cmd_len = 0;
 660         u16 rx_chain = 0;
 661         enum ieee80211_band band;
 662         u8 n_probes = 0;
 663         u8 rx_ant = priv->eeprom_data->valid_rx_ant;
 664         u8 rate;
 665         bool is_active = false;
 666         int  chan_mod;
 667         u8 active_chains;
 668         u8 scan_tx_antennas = priv->eeprom_data->valid_tx_ant;
 669         int ret;
 670         int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
 671                             MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
 672                             priv->fw->ucode_capa.max_probe_length;
 673         const u8 *ssid = NULL;
 674         u8 ssid_len = 0;
 675
 676         if (WARN_ON_ONCE(priv->scan_request &&
 677                          priv->scan_request->n_channels > MAX_SCAN_CHANNEL))
 678                 return -EINVAL;
 679
 680         lockdep_assert_held(&priv->mutex);
 681
 682         if (vif)
 683                 ctx = iwl_rxon_ctx_from_vif(vif);
 684
 685         if (!priv->scan_cmd) {
 686                 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
 687                 if (!priv->scan_cmd) {
 688                         IWL_DEBUG_SCAN(priv,
 689                                        "fail to allocate memory for scan\n");
 690                         return -ENOMEM;
 691                 }
 692         }
 693         scan = priv->scan_cmd;
 694         memset(scan, 0, scan_cmd_size);
 695
 696         scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
 697         scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
 698
 699         if (priv->scan_type != IWL_SCAN_ROC &&
 700             iwl_is_any_associated(priv)) {
 701                 u16 interval = 0;
 702                 u32 extra;
 703                 u32 suspend_time = 100;
 704                 u32 scan_suspend_time = 100;
 705
 706                 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
 707                 switch (priv->scan_type) {
 708                 case IWL_SCAN_ROC:
 709                         WARN_ON(1);
 710                         break;
 711                 case IWL_SCAN_RADIO_RESET:
 712                         interval = 0;
 713                         break;
 714                 case IWL_SCAN_NORMAL:
 715                         interval = vif->bss_conf.beacon_int;
 716                         break;
 717                 }
 718
 719                 scan->suspend_time = 0;
 720                 scan->max_out_time = cpu_to_le32(200 * 1024);
 721                 if (!interval)
 722                         interval = suspend_time;
 723
 724                 extra = (suspend_time / interval) << 22;
 725                 scan_suspend_time = (extra |
 726                     ((suspend_time % interval) * 1024));
 727                 scan->suspend_time = cpu_to_le32(scan_suspend_time);
 728                 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
 729                                scan_suspend_time, interval);
 730         } else if (priv->scan_type == IWL_SCAN_ROC) {
 731                 scan->suspend_time = 0;
 732                 scan->max_out_time = 0;
 733                 scan->quiet_time = 0;
 734                 scan->quiet_plcp_th = 0;
 735         }
 736
 737         switch (priv->scan_type) {
 738         case IWL_SCAN_RADIO_RESET:
 739                 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
 740                 /*
 741                  * Override quiet time as firmware checks that active
 742                  * dwell is >= quiet; since we use passive scan it'll
 743                  * not actually be used.
 744                  */
 745                 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
 746                 break;
 747         case IWL_SCAN_NORMAL:
 748                 if (priv->scan_request->n_ssids) {
 749                         int i, p = 0;
 750                         IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
 751                         /*
 752                          * The highest priority SSID is inserted to the
 753                          * probe request template.
 754                          */
 755                         ssid_len = priv->scan_request->ssids[0].ssid_len;
 756                         ssid = priv->scan_request->ssids[0].ssid;
 757
 758                         /*
 759                          * Invert the order of ssids, the firmware will invert
 760                          * it back.
 761                          */
 762                         for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
 763                                 scan->direct_scan[p].id = WLAN_EID_SSID;
 764                                 scan->direct_scan[p].len =
 765                                         priv->scan_request->ssids[i].ssid_len;
 766                                 memcpy(scan->direct_scan[p].ssid,
 767                                        priv->scan_request->ssids[i].ssid,
 768                                        priv->scan_request->ssids[i].ssid_len);
 769                                 n_probes++;
 770                                 p++;
 771                         }
 772                         is_active = true;
 773                 } else
 774                         IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
 775                 break;
 776         case IWL_SCAN_ROC:
 777                 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
 778                 break;
 779         }
 780
 781         scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
 782         scan->tx_cmd.sta_id = ctx->bcast_sta_id;
 783         scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
 784
 785         switch (priv->scan_band) {
 786         case IEEE80211_BAND_2GHZ:
 787                 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
 788                 chan_mod = le32_to_cpu(
 789                         priv->contexts[IWL_RXON_CTX_BSS].active.flags &
 790                                                 RXON_FLG_CHANNEL_MODE_MSK)
 791                                        >> RXON_FLG_CHANNEL_MODE_POS;
 792                 if ((priv->scan_request && priv->scan_request->no_cck) ||
 793                     chan_mod == CHANNEL_MODE_PURE_40) {
 794                         rate = IWL_RATE_6M_PLCP;
 795                 } else {
 796                         rate = IWL_RATE_1M_PLCP;
 797                         rate_flags = RATE_MCS_CCK_MSK;
 798                 }
 799                 /*
 800                  * Internal scans are passive, so we can indiscriminately set
 801                  * the BT ignore flag on 2.4 GHz since it applies to TX only.
 802                  */
 803                 if (priv->cfg->bt_params &&
 804                     priv->cfg->bt_params->advanced_bt_coexist)
 805                         scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
 806                 break;
 807         case IEEE80211_BAND_5GHZ:
 808                 rate = IWL_RATE_6M_PLCP;
 809                 break;
 810         default:
 811                 IWL_WARN(priv, "Invalid scan band\n");
 812                 return -EIO;
 813         }
 814
 815         /*
 816          * If active scanning is requested but a certain channel is
 817          * marked passive, we can do active scanning if we detect
 818          * transmissions.
 819          *
 820          * There is an issue with some firmware versions that triggers
 821          * a sysassert on a "good CRC threshold" of zero (== disabled),
 822          * on a radar channel even though this means that we should NOT
 823          * send probes.
 824          *
 825          * The "good CRC threshold" is the number of frames that we
 826          * need to receive during our dwell time on a channel before
 827          * sending out probes -- setting this to a huge value will
 828          * mean we never reach it, but at the same time work around
 829          * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
 830          * here instead of IWL_GOOD_CRC_TH_DISABLED.
 831          *
 832          * This was fixed in later versions along with some other
 833          * scan changes, and the threshold behaves as a flag in those
 834          * versions.
 835          */
 836         if (priv->new_scan_threshold_behaviour)
 837                 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
 838                                                 IWL_GOOD_CRC_TH_DISABLED;
 839         else
 840                 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
 841                                                 IWL_GOOD_CRC_TH_NEVER;
 842
 843         band = priv->scan_band;
 844
 845         if (band == IEEE80211_BAND_2GHZ &&
 846             priv->cfg->bt_params &&
 847             priv->cfg->bt_params->advanced_bt_coexist) {
 848                 /* transmit 2.4 GHz probes only on first antenna */
 849                 scan_tx_antennas = first_antenna(scan_tx_antennas);
 850         }
 851
 852         priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
 853                                                     priv->scan_tx_ant[band],
 854                                                     scan_tx_antennas);
 855         rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
 856         scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
 857
 858         /*
 859          * In power save mode while associated use one chain,
 860          * otherwise use all chains
 861          */
 862         if (test_bit(STATUS_POWER_PMI, &priv->status) &&
 863             !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
 864                 /* rx_ant has been set to all valid chains previously */
 865                 active_chains = rx_ant &
 866                                 ((u8)(priv->chain_noise_data.active_chains));
 867                 if (!active_chains)
 868                         active_chains = rx_ant;
 869
 870                 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
 871                                 priv->chain_noise_data.active_chains);
 872
 873                 rx_ant = first_antenna(active_chains);
 874         }
 875         if (priv->cfg->bt_params &&
 876             priv->cfg->bt_params->advanced_bt_coexist &&
 877             priv->bt_full_concurrent) {
 878                 /* operated as 1x1 in full concurrency mode */
 879                 rx_ant = first_antenna(rx_ant);
 880         }
 881
 882         /* MIMO is not used here, but value is required */
 883         rx_chain |=
 884                 priv->eeprom_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
 885         rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
 886         rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
 887         rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
 888         scan->rx_chain = cpu_to_le16(rx_chain);
 889         switch (priv->scan_type) {
 890         case IWL_SCAN_NORMAL:
 891                 cmd_len = iwl_fill_probe_req(
 892                                         (struct ieee80211_mgmt *)scan->data,
 893                                         vif->addr,
 894                                         priv->scan_request->ie,
 895                                         priv->scan_request->ie_len,
 896                                         ssid, ssid_len,
 897                                         scan_cmd_size - sizeof(*scan));
 898                 break;
 899         case IWL_SCAN_RADIO_RESET:
 900         case IWL_SCAN_ROC:
 901                 /* use bcast addr, will not be transmitted but must be valid */
 902                 cmd_len = iwl_fill_probe_req(
 903                                         (struct ieee80211_mgmt *)scan->data,
 904                                         iwl_bcast_addr, NULL, 0,
 905                                         NULL, 0,
 906                                         scan_cmd_size - sizeof(*scan));
 907                 break;
 908         default:
 909                 BUG();
 910         }
 911         scan->tx_cmd.len = cpu_to_le16(cmd_len);
 912
 913         scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
 914                                RXON_FILTER_BCON_AWARE_MSK);
 915
 916         switch (priv->scan_type) {
 917         case IWL_SCAN_RADIO_RESET:
 918                 scan->channel_count =
 919                         iwl_get_channel_for_reset_scan(priv, vif, band,
 920                                 (void *)&scan->data[cmd_len]);
 921                 break;
 922         case IWL_SCAN_NORMAL:
 923                 scan->channel_count =
 924                         iwl_get_channels_for_scan(priv, vif, band,
 925                                 is_active, n_probes,
 926                                 (void *)&scan->data[cmd_len]);
 927                 break;
 928         case IWL_SCAN_ROC: {
 929                 struct iwl_scan_channel *scan_ch;
 930                 int n_chan, i;
 931                 u16 dwell;
 932
 933                 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
 934                 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
 935
 936                 scan->channel_count = n_chan;
 937
 938                 scan_ch = (void *)&scan->data[cmd_len];
 939
 940                 for (i = 0; i < n_chan; i++) {
 941                         scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
 942                         scan_ch->channel =
 943                                 cpu_to_le16(priv->hw_roc_channel->hw_value);
 944
 945                         if (i == n_chan - 1)
 946                                 dwell = priv->hw_roc_duration - i * dwell;
 947
 948                         scan_ch->active_dwell =
 949                         scan_ch->passive_dwell = cpu_to_le16(dwell);
 950
 951                         /* Set txpower levels to defaults */
 952                         scan_ch->dsp_atten = 110;
 953
 954                         /* NOTE: if we were doing 6Mb OFDM for scans we'd use
 955                          * power level:
 956                          * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
 957                          */
 958                         if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
 959                                 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
 960                         else
 961                                 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
 962
 963                         scan_ch++;
 964                 }
 965                 }
 966
 967                 break;
 968         }
 969
 970         if (scan->channel_count == 0) {
 971                 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
 972                 return -EIO;
 973         }
 974
 975         cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
 976             scan->channel_count * sizeof(struct iwl_scan_channel);
 977         cmd.data[0] = scan;
 978         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 979         scan->len = cpu_to_le16(cmd.len[0]);
 980
 981         /* set scan bit here for PAN params */
 982         set_bit(STATUS_SCAN_HW, &priv->status);
 983
 984         ret = iwlagn_set_pan_params(priv);
 985         if (ret) {
 986                 clear_bit(STATUS_SCAN_HW, &priv->status);
 987                 return ret;
 988         }
 989
 990         ret = iwl_dvm_send_cmd(priv, &cmd);
 991         if (ret) {
 992                 clear_bit(STATUS_SCAN_HW, &priv->status);
 993                 iwlagn_set_pan_params(priv);
 994         }
 995
 996         return ret;
 997 }
 998
 999 void iwl_init_scan_params(struct iwl_priv *priv)
1000 {
1001         u8 ant_idx = fls(priv->eeprom_data->valid_tx_ant) - 1;
1002         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
1003                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
1004         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
1005                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
1006 }
1007
1008 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
1009                                    struct ieee80211_vif *vif,
1010                                    enum iwl_scan_type scan_type,
1011                                    enum ieee80211_band band)
1012 {
1013         int ret;
1014
1015         lockdep_assert_held(&priv->mutex);
1016
1017         cancel_delayed_work(&priv->scan_check);
1018
1019         if (!iwl_is_ready_rf(priv)) {
1020                 IWL_WARN(priv, "Request scan called when driver not ready.\n");
1021                 return -EIO;
1022         }
1023
1024         if (test_bit(STATUS_SCAN_HW, &priv->status)) {
1025                 IWL_DEBUG_SCAN(priv,
1026                         "Multiple concurrent scan requests in parallel.\n");
1027                 return -EBUSY;
1028         }
1029
1030         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
1031                 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
1032                 return -EBUSY;
1033         }
1034
1035         IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
1036                         scan_type == IWL_SCAN_NORMAL ? "" :
1037                         scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
1038                         "internal short ");
1039
1040         set_bit(STATUS_SCANNING, &priv->status);
1041         priv->scan_type = scan_type;
1042         priv->scan_start = jiffies;
1043         priv->scan_band = band;
1044
1045         ret = iwlagn_request_scan(priv, vif);
1046         if (ret) {
1047                 clear_bit(STATUS_SCANNING, &priv->status);
1048                 priv->scan_type = IWL_SCAN_NORMAL;
1049                 return ret;
1050         }
1051
1052         queue_delayed_work(priv->workqueue, &priv->scan_check,
1053                            IWL_SCAN_CHECK_WATCHDOG);
1054
1055         return 0;
1056 }
1057
1058
1059 /*
1060  * internal short scan, this function should only been called while associated.
1061  * It will reset and tune the radio to prevent possible RF related problem
1062  */
1063 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
1064 {
1065         queue_work(priv->workqueue, &priv->start_internal_scan);
1066 }
1067
1068 static void iwl_bg_start_internal_scan(struct work_struct *work)
1069 {
1070         struct iwl_priv *priv =
1071                 container_of(work, struct iwl_priv, start_internal_scan);
1072
1073         IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1074
1075         mutex_lock(&priv->mutex);
1076
1077         if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1078                 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1079                 goto unlock;
1080         }
1081
1082         if (test_bit(STATUS_SCANNING, &priv->status)) {
1083                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1084                 goto unlock;
1085         }
1086
1087         if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1088                 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1089  unlock:
1090         mutex_unlock(&priv->mutex);
1091 }
1092
1093 static void iwl_bg_scan_check(struct work_struct *data)
1094 {
1095         struct iwl_priv *priv =
1096             container_of(data, struct iwl_priv, scan_check.work);
1097
1098         IWL_DEBUG_SCAN(priv, "Scan check work\n");
1099
1100         /* Since we are here firmware does not finish scan and
1101          * most likely is in bad shape, so we don't bother to
1102          * send abort command, just force scan complete to mac80211 */
1103         mutex_lock(&priv->mutex);
1104         iwl_force_scan_end(priv);
1105         mutex_unlock(&priv->mutex);
1106 }
1107
1108 static void iwl_bg_abort_scan(struct work_struct *work)
1109 {
1110         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1111
1112         IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1113
1114         /* We keep scan_check work queued in case when firmware will not
1115          * report back scan completed notification */
1116         mutex_lock(&priv->mutex);
1117         iwl_scan_cancel_timeout(priv, 200);
1118         mutex_unlock(&priv->mutex);
1119 }
1120
1121 static void iwl_bg_scan_completed(struct work_struct *work)
1122 {
1123         struct iwl_priv *priv =
1124                 container_of(work, struct iwl_priv, scan_completed);
1125
1126         mutex_lock(&priv->mutex);
1127         iwl_process_scan_complete(priv);
1128         mutex_unlock(&priv->mutex);
1129 }
1130
1131 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1132 {
1133         INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1134         INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1135         INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1136         INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1137 }
1138
1139 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1140 {
1141         cancel_work_sync(&priv->start_internal_scan);
1142         cancel_work_sync(&priv->abort_scan);
1143         cancel_work_sync(&priv->scan_completed);
1144
1145         if (cancel_delayed_work_sync(&priv->scan_check)) {
1146                 mutex_lock(&priv->mutex);
1147                 iwl_force_scan_end(priv);
1148                 mutex_unlock(&priv->mutex);
1149         }
1150 }
1151
1152 void iwl_scan_roc_expired(struct iwl_priv *priv)
1153 {
1154         /*
1155          * The status bit should be set here, to prevent a race
1156          * where the atomic_read returns 1, but before the execution continues
1157          * iwl_scan_offchannel_skb_status() checks if the status bit is set
1158          */
1159         set_bit(STATUS_SCAN_ROC_EXPIRED, &priv->status);
1160
1161         if (atomic_read(&priv->num_aux_in_flight) == 0) {
1162                 ieee80211_remain_on_channel_expired(priv->hw);
1163                 priv->hw_roc_channel = NULL;
1164                 schedule_delayed_work(&priv->hw_roc_disable_work,
1165                                       10 * HZ);
1166
1167                 clear_bit(STATUS_SCAN_ROC_EXPIRED, &priv->status);
1168         } else {
1169                 IWL_DEBUG_SCAN(priv, "ROC done with %d frames in aux\n",
1170                                atomic_read(&priv->num_aux_in_flight));
1171         }
1172 }
1173
1174 void iwl_scan_offchannel_skb(struct iwl_priv *priv)
1175 {
1176         WARN_ON(!priv->hw_roc_start_notified);
1177         atomic_inc(&priv->num_aux_in_flight);
1178 }
1179
1180 void iwl_scan_offchannel_skb_status(struct iwl_priv *priv)
1181 {
1182         if (atomic_dec_return(&priv->num_aux_in_flight) == 0 &&
1183             test_bit(STATUS_SCAN_ROC_EXPIRED, &priv->status)) {
1184                 IWL_DEBUG_SCAN(priv, "0 aux frames. Calling ROC expired\n");
1185                 iwl_scan_roc_expired(priv);
1186         }
1187 }