drivers/net/wireless/iwlwifi/iwl-agn-rxon.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27 #include "iwl-dev.h"
  28 #include "iwl-agn.h"
  29 #include "iwl-sta.h"
  30 #include "iwl-core.h"
  31 #include "iwl-agn-calib.h"
  32
  33 static int iwlagn_disable_bss(struct iwl_priv *priv,
  34                               struct iwl_rxon_context *ctx,
  35                               struct iwl_rxon_cmd *send)
  36 {
  37         __le32 old_filter = send->filter_flags;
  38         int ret;
  39
  40         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  41         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd, sizeof(*send), send);
  42
  43         send->filter_flags = old_filter;
  44
  45         if (ret)
  46                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
  47
  48         return ret;
  49 }
  50
  51 static int iwlagn_disable_pan(struct iwl_priv *priv,
  52                               struct iwl_rxon_context *ctx,
  53                               struct iwl_rxon_cmd *send)
  54 {
  55         __le32 old_filter = send->filter_flags;
  56         u8 old_dev_type = send->dev_type;
  57         int ret;
  58
  59         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  60         send->dev_type = RXON_DEV_TYPE_P2P;
  61         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd, sizeof(*send), send);
  62
  63         send->filter_flags = old_filter;
  64         send->dev_type = old_dev_type;
  65
  66         if (ret)
  67                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
  68
  69         /* FIXME: WAIT FOR PAN DISABLE */
  70         msleep(300);
  71
  72         return ret;
  73 }
  74
  75 static int iwlagn_update_beacon(struct iwl_priv *priv,
  76                                 struct ieee80211_vif *vif)
  77 {
  78         lockdep_assert_held(&priv->mutex);
  79
  80         dev_kfree_skb(priv->beacon_skb);
  81         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
  82         if (!priv->beacon_skb)
  83                 return -ENOMEM;
  84         return iwlagn_send_beacon_cmd(priv);
  85 }
  86
  87 /**
  88  * iwlagn_commit_rxon - commit staging_rxon to hardware
  89  *
  90  * The RXON command in staging_rxon is committed to the hardware and
  91  * the active_rxon structure is updated with the new data.  This
  92  * function correctly transitions out of the RXON_ASSOC_MSK state if
  93  * a HW tune is required based on the RXON structure changes.
  94  */
  95 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
  96 {
  97         /* cast away the const for active_rxon in this function */
  98         struct iwl_rxon_cmd *active = (void *)&ctx->active;
  99         bool old_assoc = !!(ctx->active.filter_flags & RXON_FILTER_ASSOC_MSK);
 100         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 101         int ret;
 102
 103         lockdep_assert_held(&priv->mutex);
 104
 105         if (!iwl_is_alive(priv))
 106                 return -EBUSY;
 107
 108         /* This function hardcodes a bunch of dual-mode assumptions */
 109         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 110
 111         if (!ctx->is_active)
 112                 return 0;
 113
 114         /* always get timestamp with Rx frame */
 115         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 116
 117         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 118             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 119                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 120         else
 121                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 122
 123         ret = iwl_check_rxon_cmd(priv, ctx);
 124         if (ret) {
 125                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 126                 return -EINVAL;
 127         }
 128
 129         /*
 130          * receive commit_rxon request
 131          * abort any previous channel switch if still in process
 132          */
 133         if (priv->switch_rxon.switch_in_progress &&
 134             (priv->switch_rxon.channel != ctx->staging.channel)) {
 135                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 136                       le16_to_cpu(priv->switch_rxon.channel));
 137                 iwl_chswitch_done(priv, false);
 138         }
 139
 140         /*
 141          * If we don't need to send a full RXON, we can use
 142          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 143          * and other flags for the current radio configuration.
 144          */
 145         if (!iwl_full_rxon_required(priv, ctx)) {
 146                 ret = iwl_send_rxon_assoc(priv, ctx);
 147                 if (ret) {
 148                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 149                         return ret;
 150                 }
 151
 152                 memcpy(active, &ctx->staging, sizeof(*active));
 153                 iwl_print_rx_config_cmd(priv, ctx);
 154                 return 0;
 155         }
 156
 157         if (priv->cfg->ops->hcmd->set_pan_params) {
 158                 ret = priv->cfg->ops->hcmd->set_pan_params(priv);
 159                 if (ret)
 160                         return ret;
 161         }
 162
 163         iwl_set_rxon_hwcrypto(priv, ctx, !priv->cfg->mod_params->sw_crypto);
 164
 165         IWL_DEBUG_INFO(priv,
 166                        "Going to commit RXON\n"
 167                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 168                        "  * channel = %d\n"
 169                        "  * bssid = %pM\n",
 170                        (new_assoc ? "" : "out"),
 171                        le16_to_cpu(ctx->staging.channel),
 172                        ctx->staging.bssid_addr);
 173
 174         /*
 175          * If we are currently associated and the new config is also
 176          * going to be associated, OR if the new config is simply not
 177          * associated, clear associated.
 178          */
 179         if ((old_assoc && new_assoc) || !new_assoc) {
 180                 struct iwl_rxon_cmd *send = active;
 181
 182                 if (!new_assoc)
 183                         send = &ctx->staging;
 184
 185                 if (ctx->ctxid == IWL_RXON_CTX_BSS)
 186                         ret = iwlagn_disable_bss(priv, ctx, send);
 187                 else
 188                         ret = iwlagn_disable_pan(priv, ctx, send);
 189                 if (ret)
 190                         return ret;
 191
 192                 if (send != active)
 193                         memcpy(active, send, sizeof(*active));
 194
 195                 /*
 196                  * Un-assoc RXON clears the station table and WEP
 197                  * keys, so we have to restore those afterwards.
 198                  */
 199                 iwl_clear_ucode_stations(priv, ctx);
 200                 iwl_restore_stations(priv, ctx);
 201                 ret = iwl_restore_default_wep_keys(priv, ctx);
 202                 if (ret) {
 203                         IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 204                         return ret;
 205                 }
 206         }
 207
 208         /* RXON timing must be before associated RXON */
 209         ret = iwl_send_rxon_timing(priv, ctx);
 210         if (ret) {
 211                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 212                 return ret;
 213         }
 214
 215         if (new_assoc) {
 216                 /*
 217                  * We'll run into this code path when beaconing is
 218                  * enabled, but then we also need to send the beacon
 219                  * to the device.
 220                  */
 221                 if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 222                         ret = iwlagn_update_beacon(priv, ctx->vif);
 223                         if (ret) {
 224                                 IWL_ERR(priv,
 225                                         "Error sending required beacon (%d)!\n",
 226                                         ret);
 227                                 return ret;
 228                         }
 229                 }
 230
 231                 priv->start_calib = 0;
 232                 /*
 233                  * Apply the new configuration.
 234                  *
 235                  * Associated RXON doesn't clear the station table in uCode,
 236                  * so we don't need to restore stations etc. after this.
 237                  */
 238                 ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd,
 239                               sizeof(struct iwl_rxon_cmd), &ctx->staging);
 240                 if (ret) {
 241                         IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 242                         return ret;
 243                 }
 244                 memcpy(active, &ctx->staging, sizeof(*active));
 245
 246                 /* IBSS beacon needs to be sent after setting assoc */
 247                 if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 248                         if (iwlagn_update_beacon(priv, ctx->vif))
 249                                 IWL_ERR(priv, "Error sending IBSS beacon\n");
 250         }
 251
 252         iwl_print_rx_config_cmd(priv, ctx);
 253
 254         iwl_init_sensitivity(priv);
 255
 256         /*
 257          * If we issue a new RXON command which required a tune then we must
 258          * send a new TXPOWER command or we won't be able to Tx any frames.
 259          *
 260          * FIXME: which RXON requires a tune? Can we optimise this out in
 261          *        some cases?
 262          */
 263         ret = iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
 264         if (ret) {
 265                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 266                 return ret;
 267         }
 268
 269         return 0;
 270 }
 271
 272 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 273 {
 274         struct iwl_priv *priv = hw->priv;
 275         struct iwl_rxon_context *ctx;
 276         struct ieee80211_conf *conf = &hw->conf;
 277         struct ieee80211_channel *channel = conf->channel;
 278         const struct iwl_channel_info *ch_info;
 279         int ret = 0;
 280
 281         IWL_DEBUG_MAC80211(priv, "changed %#x", changed);
 282
 283         mutex_lock(&priv->mutex);
 284
 285         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
 286                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 287                 goto out;
 288         }
 289
 290         if (!iwl_is_ready(priv)) {
 291                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 292                 goto out;
 293         }
 294
 295         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 296                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 297                 /* mac80211 uses static for non-HT which is what we want */
 298                 priv->current_ht_config.smps = conf->smps_mode;
 299
 300                 /*
 301                  * Recalculate chain counts.
 302                  *
 303                  * If monitor mode is enabled then mac80211 will
 304                  * set up the SM PS mode to OFF if an HT channel is
 305                  * configured.
 306                  */
 307                 if (priv->cfg->ops->hcmd->set_rxon_chain)
 308                         for_each_context(priv, ctx)
 309                                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
 310         }
 311
 312         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 313                 unsigned long flags;
 314
 315                 ch_info = iwl_get_channel_info(priv, channel->band,
 316                                                channel->hw_value);
 317                 if (!is_channel_valid(ch_info)) {
 318                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 319                         ret = -EINVAL;
 320                         goto out;
 321                 }
 322
 323                 spin_lock_irqsave(&priv->lock, flags);
 324
 325                 for_each_context(priv, ctx) {
 326                         /* Configure HT40 channels */
 327                         ctx->ht.enabled = conf_is_ht(conf);
 328                         if (ctx->ht.enabled) {
 329                                 if (conf_is_ht40_minus(conf)) {
 330                                         ctx->ht.extension_chan_offset =
 331                                                 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 332                                         ctx->ht.is_40mhz = true;
 333                                 } else if (conf_is_ht40_plus(conf)) {
 334                                         ctx->ht.extension_chan_offset =
 335                                                 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 336                                         ctx->ht.is_40mhz = true;
 337                                 } else {
 338                                         ctx->ht.extension_chan_offset =
 339                                                 IEEE80211_HT_PARAM_CHA_SEC_NONE;
 340                                         ctx->ht.is_40mhz = false;
 341                                 }
 342                         } else
 343                                 ctx->ht.is_40mhz = false;
 344
 345                         /*
 346                          * Default to no protection. Protection mode will
 347                          * later be set from BSS config in iwl_ht_conf
 348                          */
 349                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 350
 351                         /* if we are switching from ht to 2.4 clear flags
 352                          * from any ht related info since 2.4 does not
 353                          * support ht */
 354                         if (le16_to_cpu(ctx->staging.channel) !=
 355                             channel->hw_value)
 356                                 ctx->staging.flags = 0;
 357
 358                         iwl_set_rxon_channel(priv, channel, ctx);
 359                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 360
 361                         iwl_set_flags_for_band(priv, ctx, channel->band,
 362                                                ctx->vif);
 363                 }
 364
 365                 spin_unlock_irqrestore(&priv->lock, flags);
 366
 367                 iwl_update_bcast_stations(priv);
 368
 369                 /*
 370                  * The list of supported rates and rate mask can be different
 371                  * for each band; since the band may have changed, reset
 372                  * the rate mask to what mac80211 lists.
 373                  */
 374                 iwl_set_rate(priv);
 375         }
 376
 377         if (changed & (IEEE80211_CONF_CHANGE_PS |
 378                         IEEE80211_CONF_CHANGE_IDLE)) {
 379                 ret = iwl_power_update_mode(priv, false);
 380                 if (ret)
 381                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 382         }
 383
 384         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 385                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 386                         priv->tx_power_user_lmt, conf->power_level);
 387
 388                 iwl_set_tx_power(priv, conf->power_level, false);
 389         }
 390
 391         for_each_context(priv, ctx) {
 392                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 393                         continue;
 394                 iwlagn_commit_rxon(priv, ctx);
 395         }
 396  out:
 397         mutex_unlock(&priv->mutex);
 398         return ret;
 399 }
 400
 401 static void iwlagn_update_qos(struct iwl_priv *priv,
 402                               struct iwl_rxon_context *ctx)
 403 {
 404         int ret;
 405
 406         if (!ctx->is_active)
 407                 return;
 408
 409         ctx->qos_data.def_qos_parm.qos_flags = 0;
 410
 411         if (ctx->qos_data.qos_active)
 412                 ctx->qos_data.def_qos_parm.qos_flags |=
 413                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 414
 415         if (ctx->ht.enabled)
 416                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 417
 418         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 419                       ctx->qos_data.qos_active,
 420                       ctx->qos_data.def_qos_parm.qos_flags);
 421
 422         ret = iwl_send_cmd_pdu(priv, ctx->qos_cmd,
 423                                sizeof(struct iwl_qosparam_cmd),
 424                                &ctx->qos_data.def_qos_parm);
 425         if (ret)
 426                 IWL_ERR(priv, "Failed to update QoS\n");
 427 }
 428
 429 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 430                                        struct iwl_rxon_context *ctx,
 431                                        struct ieee80211_bss_conf *bss_conf)
 432 {
 433         struct ieee80211_vif *vif = ctx->vif;
 434         struct iwl_rxon_context *tmp;
 435         struct ieee80211_sta *sta;
 436         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 437         bool need_multiple;
 438
 439         lockdep_assert_held(&priv->mutex);
 440
 441         switch (vif->type) {
 442         case NL80211_IFTYPE_STATION:
 443                 rcu_read_lock();
 444                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 445                 if (sta) {
 446                         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 447                         int maxstreams;
 448
 449                         maxstreams = (ht_cap->mcs.tx_params &
 450                                       IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
 451                                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 452                         maxstreams += 1;
 453
 454                         if ((ht_cap->mcs.rx_mask[1] == 0) &&
 455                             (ht_cap->mcs.rx_mask[2] == 0))
 456                                 need_multiple = false;
 457                         if (maxstreams <= 1)
 458                                 need_multiple = true;
 459                 } else {
 460                         /*
 461                          * If at all, this can only happen through a race
 462                          * when the AP disconnects us while we're still
 463                          * setting up the connection, in that case mac80211
 464                          * will soon tell us about that.
 465                          */
 466                         need_multiple = false;
 467                 }
 468                 rcu_read_unlock();
 469                 break;
 470         case NL80211_IFTYPE_ADHOC:
 471                 /* currently */
 472                 need_multiple = false;
 473                 break;
 474         default:
 475                 /* only AP really */
 476                 need_multiple = true;
 477                 break;
 478         }
 479
 480         ctx->ht_need_multiple_chains = need_multiple;
 481
 482         if (!need_multiple) {
 483                 /* check all contexts */
 484                 for_each_context(priv, tmp) {
 485                         if (!tmp->vif)
 486                                 continue;
 487                         if (tmp->ht_need_multiple_chains) {
 488                                 need_multiple = true;
 489                                 break;
 490                         }
 491                 }
 492         }
 493
 494         ht_conf->single_chain_sufficient = !need_multiple;
 495 }
 496
 497 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 498                              struct ieee80211_vif *vif,
 499                              struct ieee80211_bss_conf *bss_conf,
 500                              u32 changes)
 501 {
 502         struct iwl_priv *priv = hw->priv;
 503         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 504         int ret;
 505         bool force = false;
 506
 507         mutex_lock(&priv->mutex);
 508
 509         if (changes & BSS_CHANGED_BEACON_INT)
 510                 force = true;
 511
 512         if (changes & BSS_CHANGED_QOS) {
 513                 ctx->qos_data.qos_active = bss_conf->qos;
 514                 iwlagn_update_qos(priv, ctx);
 515         }
 516
 517         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 518         if (vif->bss_conf.use_short_preamble)
 519                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 520         else
 521                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 522
 523         if (changes & BSS_CHANGED_ASSOC) {
 524                 if (bss_conf->assoc) {
 525                         iwl_led_associate(priv);
 526                         priv->timestamp = bss_conf->timestamp;
 527                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 528                 } else {
 529                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 530                         iwl_led_disassociate(priv);
 531                 }
 532         }
 533
 534         if (ctx->ht.enabled) {
 535                 ctx->ht.protection = bss_conf->ht_operation_mode &
 536                                         IEEE80211_HT_OP_MODE_PROTECTION;
 537                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 538                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 539                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 540         }
 541
 542         if (priv->cfg->ops->hcmd->set_rxon_chain)
 543                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
 544
 545         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 546                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 547         else
 548                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 549
 550         if (bss_conf->use_cts_prot)
 551                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 552         else
 553                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 554
 555         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 556
 557         if (vif->type == NL80211_IFTYPE_AP ||
 558             vif->type == NL80211_IFTYPE_ADHOC) {
 559                 if (vif->bss_conf.enable_beacon) {
 560                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 561                         priv->beacon_ctx = ctx;
 562                 } else {
 563                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 564                         priv->beacon_ctx = NULL;
 565                 }
 566         }
 567
 568         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 569                 iwlagn_commit_rxon(priv, ctx);
 570
 571         if (changes & BSS_CHANGED_IBSS) {
 572                 ret = iwlagn_manage_ibss_station(priv, vif,
 573                                                  bss_conf->ibss_joined);
 574                 if (ret)
 575                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 576                                 bss_conf->ibss_joined ? "add" : "remove",
 577                                 bss_conf->bssid);
 578         }
 579
 580         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 581             priv->beacon_ctx) {
 582                 if (iwlagn_update_beacon(priv, vif))
 583                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 584         }
 585
 586         mutex_unlock(&priv->mutex);
 587 }
 588
 589 void iwlagn_post_scan(struct iwl_priv *priv)
 590 {
 591         struct iwl_rxon_context *ctx;
 592
 593         /*
 594          * Since setting the RXON may have been deferred while
 595          * performing the scan, fire one off if needed
 596          */
 597         for_each_context(priv, ctx)
 598                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 599                         iwlagn_commit_rxon(priv, ctx);
 600
 601         if (priv->cfg->ops->hcmd->set_pan_params)
 602                 priv->cfg->ops->hcmd->set_pan_params(priv);
 603 }