net/mac80211/chan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * mac80211 - channel management
   4  * Copyright 2020 - 2021 Intel Corporation
   5  */
   6
   7 #include <linux/nl80211.h>
   8 #include <linux/export.h>
   9 #include <linux/rtnetlink.h>
  10 #include <net/cfg80211.h>
  11 #include "ieee80211_i.h"
  12 #include "driver-ops.h"
  13 #include "rate.h"
  14
  15 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
  16                                           struct ieee80211_chanctx *ctx)
  17 {
  18         struct ieee80211_sub_if_data *sdata;
  19         int num = 0;
  20
  21         lockdep_assert_held(&local->chanctx_mtx);
  22
  23         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
  24                 num++;
  25
  26         return num;
  27 }
  28
  29 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
  30                                           struct ieee80211_chanctx *ctx)
  31 {
  32         struct ieee80211_sub_if_data *sdata;
  33         int num = 0;
  34
  35         lockdep_assert_held(&local->chanctx_mtx);
  36
  37         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
  38                 num++;
  39
  40         return num;
  41 }
  42
  43 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
  44                                struct ieee80211_chanctx *ctx)
  45 {
  46         return ieee80211_chanctx_num_assigned(local, ctx) +
  47                ieee80211_chanctx_num_reserved(local, ctx);
  48 }
  49
  50 static int ieee80211_num_chanctx(struct ieee80211_local *local)
  51 {
  52         struct ieee80211_chanctx *ctx;
  53         int num = 0;
  54
  55         lockdep_assert_held(&local->chanctx_mtx);
  56
  57         list_for_each_entry(ctx, &local->chanctx_list, list)
  58                 num++;
  59
  60         return num;
  61 }
  62
  63 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
  64 {
  65         lockdep_assert_held(&local->chanctx_mtx);
  66         return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
  67 }
  68
  69 static struct ieee80211_chanctx *
  70 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
  71 {
  72         struct ieee80211_local *local __maybe_unused = sdata->local;
  73         struct ieee80211_chanctx_conf *conf;
  74
  75         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
  76                                          lockdep_is_held(&local->chanctx_mtx));
  77         if (!conf)
  78                 return NULL;
  79
  80         return container_of(conf, struct ieee80211_chanctx, conf);
  81 }
  82
  83 static const struct cfg80211_chan_def *
  84 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
  85                                    struct ieee80211_chanctx *ctx,
  86                                    const struct cfg80211_chan_def *compat)
  87 {
  88         struct ieee80211_sub_if_data *sdata;
  89
  90         lockdep_assert_held(&local->chanctx_mtx);
  91
  92         list_for_each_entry(sdata, &ctx->reserved_vifs,
  93                             reserved_chanctx_list) {
  94                 if (!compat)
  95                         compat = &sdata->reserved_chandef;
  96
  97                 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
  98                                                      compat);
  99                 if (!compat)
 100                         break;
 101         }
 102
 103         return compat;
 104 }
 105
 106 static const struct cfg80211_chan_def *
 107 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
 108                                        struct ieee80211_chanctx *ctx,
 109                                        const struct cfg80211_chan_def *compat)
 110 {
 111         struct ieee80211_sub_if_data *sdata;
 112
 113         lockdep_assert_held(&local->chanctx_mtx);
 114
 115         list_for_each_entry(sdata, &ctx->assigned_vifs,
 116                             assigned_chanctx_list) {
 117                 if (sdata->reserved_chanctx != NULL)
 118                         continue;
 119
 120                 if (!compat)
 121                         compat = &sdata->vif.bss_conf.chandef;
 122
 123                 compat = cfg80211_chandef_compatible(
 124                                 &sdata->vif.bss_conf.chandef, compat);
 125                 if (!compat)
 126                         break;
 127         }
 128
 129         return compat;
 130 }
 131
 132 static const struct cfg80211_chan_def *
 133 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
 134                                    struct ieee80211_chanctx *ctx,
 135                                    const struct cfg80211_chan_def *compat)
 136 {
 137         lockdep_assert_held(&local->chanctx_mtx);
 138
 139         compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
 140         if (!compat)
 141                 return NULL;
 142
 143         compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
 144         if (!compat)
 145                 return NULL;
 146
 147         return compat;
 148 }
 149
 150 static bool
 151 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
 152                                       struct ieee80211_chanctx *ctx,
 153                                       const struct cfg80211_chan_def *def)
 154 {
 155         lockdep_assert_held(&local->chanctx_mtx);
 156
 157         if (ieee80211_chanctx_combined_chandef(local, ctx, def))
 158                 return true;
 159
 160         if (!list_empty(&ctx->reserved_vifs) &&
 161             ieee80211_chanctx_reserved_chandef(local, ctx, def))
 162                 return true;
 163
 164         return false;
 165 }
 166
 167 static struct ieee80211_chanctx *
 168 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
 169                                    const struct cfg80211_chan_def *chandef,
 170                                    enum ieee80211_chanctx_mode mode)
 171 {
 172         struct ieee80211_chanctx *ctx;
 173
 174         lockdep_assert_held(&local->chanctx_mtx);
 175
 176         if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
 177                 return NULL;
 178
 179         list_for_each_entry(ctx, &local->chanctx_list, list) {
 180                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
 181                         continue;
 182
 183                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
 184                         continue;
 185
 186                 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
 187                                                            chandef))
 188                         continue;
 189
 190                 return ctx;
 191         }
 192
 193         return NULL;
 194 }
 195
 196 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta)
 197 {
 198         enum ieee80211_sta_rx_bandwidth width = ieee80211_sta_cap_rx_bw(sta);
 199
 200         switch (width) {
 201         case IEEE80211_STA_RX_BW_20:
 202                 if (sta->sta.deflink.ht_cap.ht_supported)
 203                         return NL80211_CHAN_WIDTH_20;
 204                 else
 205                         return NL80211_CHAN_WIDTH_20_NOHT;
 206         case IEEE80211_STA_RX_BW_40:
 207                 return NL80211_CHAN_WIDTH_40;
 208         case IEEE80211_STA_RX_BW_80:
 209                 return NL80211_CHAN_WIDTH_80;
 210         case IEEE80211_STA_RX_BW_160:
 211                 /*
 212                  * This applied for both 160 and 80+80. since we use
 213                  * the returned value to consider degradation of
 214                  * ctx->conf.min_def, we have to make sure to take
 215                  * the bigger one (NL80211_CHAN_WIDTH_160).
 216                  * Otherwise we might try degrading even when not
 217                  * needed, as the max required sta_bw returned (80+80)
 218                  * might be smaller than the configured bw (160).
 219                  */
 220                 return NL80211_CHAN_WIDTH_160;
 221         case IEEE80211_STA_RX_BW_320:
 222                 return NL80211_CHAN_WIDTH_320;
 223         default:
 224                 WARN_ON(1);
 225                 return NL80211_CHAN_WIDTH_20;
 226         }
 227 }
 228
 229 static enum nl80211_chan_width
 230 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
 231 {
 232         enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
 233         struct sta_info *sta;
 234
 235         rcu_read_lock();
 236         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
 237                 if (sdata != sta->sdata &&
 238                     !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
 239                         continue;
 240
 241                 max_bw = max(max_bw, ieee80211_get_sta_bw(sta));
 242         }
 243         rcu_read_unlock();
 244
 245         return max_bw;
 246 }
 247
 248 static enum nl80211_chan_width
 249 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
 250                                       struct ieee80211_chanctx_conf *conf)
 251 {
 252         struct ieee80211_sub_if_data *sdata;
 253         enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
 254
 255         rcu_read_lock();
 256         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 257                 struct ieee80211_vif *vif = &sdata->vif;
 258                 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
 259
 260                 if (!ieee80211_sdata_running(sdata))
 261                         continue;
 262
 263                 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
 264                         continue;
 265
 266                 switch (vif->type) {
 267                 case NL80211_IFTYPE_AP:
 268                 case NL80211_IFTYPE_AP_VLAN:
 269                         width = ieee80211_get_max_required_bw(sdata);
 270                         break;
 271                 case NL80211_IFTYPE_STATION:
 272                         /*
 273                          * The ap's sta->bandwidth is not set yet at this
 274                          * point, so take the width from the chandef, but
 275                          * account also for TDLS peers
 276                          */
 277                         width = max(vif->bss_conf.chandef.width,
 278                                     ieee80211_get_max_required_bw(sdata));
 279                         break;
 280                 case NL80211_IFTYPE_P2P_DEVICE:
 281                 case NL80211_IFTYPE_NAN:
 282                         continue;
 283                 case NL80211_IFTYPE_ADHOC:
 284                 case NL80211_IFTYPE_MESH_POINT:
 285                 case NL80211_IFTYPE_OCB:
 286                         width = vif->bss_conf.chandef.width;
 287                         break;
 288                 case NL80211_IFTYPE_WDS:
 289                 case NL80211_IFTYPE_UNSPECIFIED:
 290                 case NUM_NL80211_IFTYPES:
 291                 case NL80211_IFTYPE_MONITOR:
 292                 case NL80211_IFTYPE_P2P_CLIENT:
 293                 case NL80211_IFTYPE_P2P_GO:
 294                         WARN_ON_ONCE(1);
 295                 }
 296                 max_bw = max(max_bw, width);
 297         }
 298
 299         /* use the configured bandwidth in case of monitor interface */
 300         sdata = rcu_dereference(local->monitor_sdata);
 301         if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
 302                 max_bw = max(max_bw, conf->def.width);
 303
 304         rcu_read_unlock();
 305
 306         return max_bw;
 307 }
 308
 309 /*
 310  * recalc the min required chan width of the channel context, which is
 311  * the max of min required widths of all the interfaces bound to this
 312  * channel context.
 313  */
 314 static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
 315                                              struct ieee80211_chanctx *ctx)
 316 {
 317         enum nl80211_chan_width max_bw;
 318         struct cfg80211_chan_def min_def;
 319
 320         lockdep_assert_held(&local->chanctx_mtx);
 321
 322         /* don't optimize non-20MHz based and radar_enabled confs */
 323         if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
 324             ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
 325             ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
 326             ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
 327             ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
 328             ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
 329             ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
 330             ctx->conf.radar_enabled) {
 331                 ctx->conf.min_def = ctx->conf.def;
 332                 return 0;
 333         }
 334
 335         max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
 336
 337         /* downgrade chandef up to max_bw */
 338         min_def = ctx->conf.def;
 339         while (min_def.width > max_bw)
 340                 ieee80211_chandef_downgrade(&min_def);
 341
 342         if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
 343                 return 0;
 344
 345         ctx->conf.min_def = min_def;
 346         if (!ctx->driver_present)
 347                 return 0;
 348
 349         return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
 350 }
 351
 352 /* calling this function is assuming that station vif is updated to
 353  * lates changes by calling ieee80211_vif_update_chandef
 354  */
 355 static void ieee80211_chan_bw_change(struct ieee80211_local *local,
 356                                      struct ieee80211_chanctx *ctx,
 357                                      bool narrowed)
 358 {
 359         struct sta_info *sta;
 360         struct ieee80211_supported_band *sband =
 361                 local->hw.wiphy->bands[ctx->conf.def.chan->band];
 362
 363         rcu_read_lock();
 364         list_for_each_entry_rcu(sta, &local->sta_list,
 365                                 list) {
 366                 enum ieee80211_sta_rx_bandwidth new_sta_bw;
 367
 368                 if (!ieee80211_sdata_running(sta->sdata))
 369                         continue;
 370
 371                 if (rcu_access_pointer(sta->sdata->vif.chanctx_conf) !=
 372                     &ctx->conf)
 373                         continue;
 374
 375                 new_sta_bw = ieee80211_sta_cur_vht_bw(sta);
 376
 377                 /* nothing change */
 378                 if (new_sta_bw == sta->sta.deflink.bandwidth)
 379                         continue;
 380
 381                 /* vif changed to narrow BW and narrow BW for station wasn't
 382                  * requested or vise versa */
 383                 if ((new_sta_bw < sta->sta.deflink.bandwidth) == !narrowed)
 384                         continue;
 385
 386                 sta->sta.deflink.bandwidth = new_sta_bw;
 387                 rate_control_rate_update(local, sband, sta,
 388                                          IEEE80211_RC_BW_CHANGED);
 389         }
 390         rcu_read_unlock();
 391 }
 392
 393 /*
 394  * recalc the min required chan width of the channel context, which is
 395  * the max of min required widths of all the interfaces bound to this
 396  * channel context.
 397  */
 398 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
 399                                       struct ieee80211_chanctx *ctx)
 400 {
 401         u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx);
 402
 403         if (!changed)
 404                 return;
 405
 406         /* check is BW narrowed */
 407         ieee80211_chan_bw_change(local, ctx, true);
 408
 409         drv_change_chanctx(local, ctx, changed);
 410
 411         /* check is BW wider */
 412         ieee80211_chan_bw_change(local, ctx, false);
 413 }
 414
 415 static void ieee80211_change_chanctx(struct ieee80211_local *local,
 416                                      struct ieee80211_chanctx *ctx,
 417                                      struct ieee80211_chanctx *old_ctx,
 418                                      const struct cfg80211_chan_def *chandef)
 419 {
 420         u32 changed;
 421
 422         /* expected to handle only 20/40/80/160/320 channel widths */
 423         switch (chandef->width) {
 424         case NL80211_CHAN_WIDTH_20_NOHT:
 425         case NL80211_CHAN_WIDTH_20:
 426         case NL80211_CHAN_WIDTH_40:
 427         case NL80211_CHAN_WIDTH_80:
 428         case NL80211_CHAN_WIDTH_80P80:
 429         case NL80211_CHAN_WIDTH_160:
 430         case NL80211_CHAN_WIDTH_320:
 431                 break;
 432         default:
 433                 WARN_ON(1);
 434         }
 435
 436         /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
 437          * due to maybe not returning from it, e.g in case new context was added
 438          * first time with all parameters up to date.
 439          */
 440         ieee80211_chan_bw_change(local, old_ctx, true);
 441
 442         if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
 443                 ieee80211_recalc_chanctx_min_def(local, ctx);
 444                 return;
 445         }
 446
 447         WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
 448
 449         ctx->conf.def = *chandef;
 450
 451         /* check if min chanctx also changed */
 452         changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
 453                   _ieee80211_recalc_chanctx_min_def(local, ctx);
 454         drv_change_chanctx(local, ctx, changed);
 455
 456         if (!local->use_chanctx) {
 457                 local->_oper_chandef = *chandef;
 458                 ieee80211_hw_config(local, 0);
 459         }
 460
 461         /* check is BW wider */
 462         ieee80211_chan_bw_change(local, old_ctx, false);
 463 }
 464
 465 static struct ieee80211_chanctx *
 466 ieee80211_find_chanctx(struct ieee80211_local *local,
 467                        const struct cfg80211_chan_def *chandef,
 468                        enum ieee80211_chanctx_mode mode)
 469 {
 470         struct ieee80211_chanctx *ctx;
 471
 472         lockdep_assert_held(&local->chanctx_mtx);
 473
 474         if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
 475                 return NULL;
 476
 477         list_for_each_entry(ctx, &local->chanctx_list, list) {
 478                 const struct cfg80211_chan_def *compat;
 479
 480                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
 481                         continue;
 482
 483                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
 484                         continue;
 485
 486                 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
 487                 if (!compat)
 488                         continue;
 489
 490                 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
 491                                                             compat);
 492                 if (!compat)
 493                         continue;
 494
 495                 ieee80211_change_chanctx(local, ctx, ctx, compat);
 496
 497                 return ctx;
 498         }
 499
 500         return NULL;
 501 }
 502
 503 bool ieee80211_is_radar_required(struct ieee80211_local *local)
 504 {
 505         struct ieee80211_sub_if_data *sdata;
 506
 507         lockdep_assert_held(&local->mtx);
 508
 509         rcu_read_lock();
 510         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 511                 if (sdata->radar_required) {
 512                         rcu_read_unlock();
 513                         return true;
 514                 }
 515         }
 516         rcu_read_unlock();
 517
 518         return false;
 519 }
 520
 521 static bool
 522 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
 523                                  struct ieee80211_chanctx *ctx)
 524 {
 525         struct ieee80211_chanctx_conf *conf = &ctx->conf;
 526         struct ieee80211_sub_if_data *sdata;
 527         bool required = false;
 528
 529         lockdep_assert_held(&local->chanctx_mtx);
 530         lockdep_assert_held(&local->mtx);
 531
 532         rcu_read_lock();
 533         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 534                 if (!ieee80211_sdata_running(sdata))
 535                         continue;
 536                 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
 537                         continue;
 538                 if (!sdata->radar_required)
 539                         continue;
 540
 541                 required = true;
 542                 break;
 543         }
 544         rcu_read_unlock();
 545
 546         return required;
 547 }
 548
 549 static struct ieee80211_chanctx *
 550 ieee80211_alloc_chanctx(struct ieee80211_local *local,
 551                         const struct cfg80211_chan_def *chandef,
 552                         enum ieee80211_chanctx_mode mode)
 553 {
 554         struct ieee80211_chanctx *ctx;
 555
 556         lockdep_assert_held(&local->chanctx_mtx);
 557
 558         ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
 559         if (!ctx)
 560                 return NULL;
 561
 562         INIT_LIST_HEAD(&ctx->assigned_vifs);
 563         INIT_LIST_HEAD(&ctx->reserved_vifs);
 564         ctx->conf.def = *chandef;
 565         ctx->conf.rx_chains_static = 1;
 566         ctx->conf.rx_chains_dynamic = 1;
 567         ctx->mode = mode;
 568         ctx->conf.radar_enabled = false;
 569         ieee80211_recalc_chanctx_min_def(local, ctx);
 570
 571         return ctx;
 572 }
 573
 574 static int ieee80211_add_chanctx(struct ieee80211_local *local,
 575                                  struct ieee80211_chanctx *ctx)
 576 {
 577         u32 changed;
 578         int err;
 579
 580         lockdep_assert_held(&local->mtx);
 581         lockdep_assert_held(&local->chanctx_mtx);
 582
 583         if (!local->use_chanctx)
 584                 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
 585
 586         /* turn idle off *before* setting channel -- some drivers need that */
 587         changed = ieee80211_idle_off(local);
 588         if (changed)
 589                 ieee80211_hw_config(local, changed);
 590
 591         if (!local->use_chanctx) {
 592                 local->_oper_chandef = ctx->conf.def;
 593                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 594         } else {
 595                 err = drv_add_chanctx(local, ctx);
 596                 if (err) {
 597                         ieee80211_recalc_idle(local);
 598                         return err;
 599                 }
 600         }
 601
 602         return 0;
 603 }
 604
 605 static struct ieee80211_chanctx *
 606 ieee80211_new_chanctx(struct ieee80211_local *local,
 607                       const struct cfg80211_chan_def *chandef,
 608                       enum ieee80211_chanctx_mode mode)
 609 {
 610         struct ieee80211_chanctx *ctx;
 611         int err;
 612
 613         lockdep_assert_held(&local->mtx);
 614         lockdep_assert_held(&local->chanctx_mtx);
 615
 616         ctx = ieee80211_alloc_chanctx(local, chandef, mode);
 617         if (!ctx)
 618                 return ERR_PTR(-ENOMEM);
 619
 620         err = ieee80211_add_chanctx(local, ctx);
 621         if (err) {
 622                 kfree(ctx);
 623                 return ERR_PTR(err);
 624         }
 625
 626         list_add_rcu(&ctx->list, &local->chanctx_list);
 627         return ctx;
 628 }
 629
 630 static void ieee80211_del_chanctx(struct ieee80211_local *local,
 631                                   struct ieee80211_chanctx *ctx)
 632 {
 633         lockdep_assert_held(&local->chanctx_mtx);
 634
 635         if (!local->use_chanctx) {
 636                 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
 637                 /* S1G doesn't have 20MHz, so get the correct width for the
 638                  * current channel.
 639                  */
 640                 if (chandef->chan->band == NL80211_BAND_S1GHZ)
 641                         chandef->width =
 642                                 ieee80211_s1g_channel_width(chandef->chan);
 643                 else
 644                         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 645                 chandef->center_freq1 = chandef->chan->center_freq;
 646                 chandef->freq1_offset = chandef->chan->freq_offset;
 647                 chandef->center_freq2 = 0;
 648
 649                 /* NOTE: Disabling radar is only valid here for
 650                  * single channel context. To be sure, check it ...
 651                  */
 652                 WARN_ON(local->hw.conf.radar_enabled &&
 653                         !list_empty(&local->chanctx_list));
 654
 655                 local->hw.conf.radar_enabled = false;
 656
 657                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 658         } else {
 659                 drv_remove_chanctx(local, ctx);
 660         }
 661
 662         ieee80211_recalc_idle(local);
 663 }
 664
 665 static void ieee80211_free_chanctx(struct ieee80211_local *local,
 666                                    struct ieee80211_chanctx *ctx)
 667 {
 668         lockdep_assert_held(&local->chanctx_mtx);
 669
 670         WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
 671
 672         list_del_rcu(&ctx->list);
 673         ieee80211_del_chanctx(local, ctx);
 674         kfree_rcu(ctx, rcu_head);
 675 }
 676
 677 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
 678                                        struct ieee80211_chanctx *ctx)
 679 {
 680         struct ieee80211_chanctx_conf *conf = &ctx->conf;
 681         struct ieee80211_sub_if_data *sdata;
 682         const struct cfg80211_chan_def *compat = NULL;
 683         struct sta_info *sta;
 684
 685         lockdep_assert_held(&local->chanctx_mtx);
 686
 687         rcu_read_lock();
 688         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 689
 690                 if (!ieee80211_sdata_running(sdata))
 691                         continue;
 692                 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
 693                         continue;
 694                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 695                         continue;
 696
 697                 if (!compat)
 698                         compat = &sdata->vif.bss_conf.chandef;
 699
 700                 compat = cfg80211_chandef_compatible(
 701                                 &sdata->vif.bss_conf.chandef, compat);
 702                 if (WARN_ON_ONCE(!compat))
 703                         break;
 704         }
 705
 706         /* TDLS peers can sometimes affect the chandef width */
 707         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 708                 if (!sta->uploaded ||
 709                     !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
 710                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
 711                     !sta->tdls_chandef.chan)
 712                         continue;
 713
 714                 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
 715                                                      compat);
 716                 if (WARN_ON_ONCE(!compat))
 717                         break;
 718         }
 719         rcu_read_unlock();
 720
 721         if (!compat)
 722                 return;
 723
 724         ieee80211_change_chanctx(local, ctx, ctx, compat);
 725 }
 726
 727 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
 728                                            struct ieee80211_chanctx *chanctx)
 729 {
 730         bool radar_enabled;
 731
 732         lockdep_assert_held(&local->chanctx_mtx);
 733         /* for ieee80211_is_radar_required */
 734         lockdep_assert_held(&local->mtx);
 735
 736         radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
 737
 738         if (radar_enabled == chanctx->conf.radar_enabled)
 739                 return;
 740
 741         chanctx->conf.radar_enabled = radar_enabled;
 742
 743         if (!local->use_chanctx) {
 744                 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
 745                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 746         }
 747
 748         drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
 749 }
 750
 751 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
 752                                         struct ieee80211_chanctx *new_ctx)
 753 {
 754         struct ieee80211_local *local = sdata->local;
 755         struct ieee80211_chanctx_conf *conf;
 756         struct ieee80211_chanctx *curr_ctx = NULL;
 757         int ret = 0;
 758
 759         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
 760                 return -ENOTSUPP;
 761
 762         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
 763                                          lockdep_is_held(&local->chanctx_mtx));
 764
 765         if (conf) {
 766                 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
 767
 768                 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
 769                 conf = NULL;
 770                 list_del(&sdata->assigned_chanctx_list);
 771         }
 772
 773         if (new_ctx) {
 774                 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
 775                 if (ret)
 776                         goto out;
 777
 778                 conf = &new_ctx->conf;
 779                 list_add(&sdata->assigned_chanctx_list,
 780                          &new_ctx->assigned_vifs);
 781         }
 782
 783 out:
 784         rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
 785
 786         sdata->vif.bss_conf.idle = !conf;
 787
 788         if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
 789                 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
 790                 ieee80211_recalc_smps_chanctx(local, curr_ctx);
 791                 ieee80211_recalc_radar_chanctx(local, curr_ctx);
 792                 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
 793         }
 794
 795         if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
 796                 ieee80211_recalc_txpower(sdata, false);
 797                 ieee80211_recalc_chanctx_min_def(local, new_ctx);
 798         }
 799
 800         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 801             sdata->vif.type != NL80211_IFTYPE_MONITOR)
 802                 ieee80211_bss_info_change_notify(sdata,
 803                                                  BSS_CHANGED_IDLE);
 804
 805         ieee80211_check_fast_xmit_iface(sdata);
 806
 807         return ret;
 808 }
 809
 810 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
 811                                    struct ieee80211_chanctx *chanctx)
 812 {
 813         struct ieee80211_sub_if_data *sdata;
 814         u8 rx_chains_static, rx_chains_dynamic;
 815
 816         lockdep_assert_held(&local->chanctx_mtx);
 817
 818         rx_chains_static = 1;
 819         rx_chains_dynamic = 1;
 820
 821         rcu_read_lock();
 822         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 823                 u8 needed_static, needed_dynamic;
 824
 825                 if (!ieee80211_sdata_running(sdata))
 826                         continue;
 827
 828                 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
 829                                                 &chanctx->conf)
 830                         continue;
 831
 832                 switch (sdata->vif.type) {
 833                 case NL80211_IFTYPE_P2P_DEVICE:
 834                 case NL80211_IFTYPE_NAN:
 835                         continue;
 836                 case NL80211_IFTYPE_STATION:
 837                         if (!sdata->u.mgd.associated)
 838                                 continue;
 839                         break;
 840                 case NL80211_IFTYPE_AP_VLAN:
 841                         continue;
 842                 case NL80211_IFTYPE_AP:
 843                 case NL80211_IFTYPE_ADHOC:
 844                 case NL80211_IFTYPE_MESH_POINT:
 845                 case NL80211_IFTYPE_OCB:
 846                         break;
 847                 default:
 848                         WARN_ON_ONCE(1);
 849                 }
 850
 851                 switch (sdata->smps_mode) {
 852                 default:
 853                         WARN_ONCE(1, "Invalid SMPS mode %d\n",
 854                                   sdata->smps_mode);
 855                         fallthrough;
 856                 case IEEE80211_SMPS_OFF:
 857                         needed_static = sdata->needed_rx_chains;
 858                         needed_dynamic = sdata->needed_rx_chains;
 859                         break;
 860                 case IEEE80211_SMPS_DYNAMIC:
 861                         needed_static = 1;
 862                         needed_dynamic = sdata->needed_rx_chains;
 863                         break;
 864                 case IEEE80211_SMPS_STATIC:
 865                         needed_static = 1;
 866                         needed_dynamic = 1;
 867                         break;
 868                 }
 869
 870                 rx_chains_static = max(rx_chains_static, needed_static);
 871                 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
 872         }
 873
 874         /* Disable SMPS for the monitor interface */
 875         sdata = rcu_dereference(local->monitor_sdata);
 876         if (sdata &&
 877             rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
 878                 rx_chains_dynamic = rx_chains_static = local->rx_chains;
 879
 880         rcu_read_unlock();
 881
 882         if (!local->use_chanctx) {
 883                 if (rx_chains_static > 1)
 884                         local->smps_mode = IEEE80211_SMPS_OFF;
 885                 else if (rx_chains_dynamic > 1)
 886                         local->smps_mode = IEEE80211_SMPS_DYNAMIC;
 887                 else
 888                         local->smps_mode = IEEE80211_SMPS_STATIC;
 889                 ieee80211_hw_config(local, 0);
 890         }
 891
 892         if (rx_chains_static == chanctx->conf.rx_chains_static &&
 893             rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
 894                 return;
 895
 896         chanctx->conf.rx_chains_static = rx_chains_static;
 897         chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
 898         drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
 899 }
 900
 901 static void
 902 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
 903                                       bool clear)
 904 {
 905         struct ieee80211_local *local __maybe_unused = sdata->local;
 906         struct ieee80211_sub_if_data *vlan;
 907         struct ieee80211_chanctx_conf *conf;
 908
 909         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
 910                 return;
 911
 912         lockdep_assert_held(&local->mtx);
 913
 914         /* Check that conf exists, even when clearing this function
 915          * must be called with the AP's channel context still there
 916          * as it would otherwise cause VLANs to have an invalid
 917          * channel context pointer for a while, possibly pointing
 918          * to a channel context that has already been freed.
 919          */
 920         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
 921                                          lockdep_is_held(&local->chanctx_mtx));
 922         WARN_ON(!conf);
 923
 924         if (clear)
 925                 conf = NULL;
 926
 927         list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 928                 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
 929 }
 930
 931 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
 932                                          bool clear)
 933 {
 934         struct ieee80211_local *local = sdata->local;
 935
 936         mutex_lock(&local->chanctx_mtx);
 937
 938         __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
 939
 940         mutex_unlock(&local->chanctx_mtx);
 941 }
 942
 943 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
 944 {
 945         struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
 946
 947         lockdep_assert_held(&sdata->local->chanctx_mtx);
 948
 949         if (WARN_ON(!ctx))
 950                 return -EINVAL;
 951
 952         list_del(&sdata->reserved_chanctx_list);
 953         sdata->reserved_chanctx = NULL;
 954
 955         if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
 956                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
 957                         if (WARN_ON(!ctx->replace_ctx))
 958                                 return -EINVAL;
 959
 960                         WARN_ON(ctx->replace_ctx->replace_state !=
 961                                 IEEE80211_CHANCTX_WILL_BE_REPLACED);
 962                         WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
 963
 964                         ctx->replace_ctx->replace_ctx = NULL;
 965                         ctx->replace_ctx->replace_state =
 966                                         IEEE80211_CHANCTX_REPLACE_NONE;
 967
 968                         list_del_rcu(&ctx->list);
 969                         kfree_rcu(ctx, rcu_head);
 970                 } else {
 971                         ieee80211_free_chanctx(sdata->local, ctx);
 972                 }
 973         }
 974
 975         return 0;
 976 }
 977
 978 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
 979                                   const struct cfg80211_chan_def *chandef,
 980                                   enum ieee80211_chanctx_mode mode,
 981                                   bool radar_required)
 982 {
 983         struct ieee80211_local *local = sdata->local;
 984         struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
 985
 986         lockdep_assert_held(&local->chanctx_mtx);
 987
 988         curr_ctx = ieee80211_vif_get_chanctx(sdata);
 989         if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
 990                 return -ENOTSUPP;
 991
 992         new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
 993         if (!new_ctx) {
 994                 if (ieee80211_can_create_new_chanctx(local)) {
 995                         new_ctx = ieee80211_new_chanctx(local, chandef, mode);
 996                         if (IS_ERR(new_ctx))
 997                                 return PTR_ERR(new_ctx);
 998                 } else {
 999                         if (!curr_ctx ||
1000                             (curr_ctx->replace_state ==
1001                              IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1002                             !list_empty(&curr_ctx->reserved_vifs)) {
1003                                 /*
1004                                  * Another vif already requested this context
1005                                  * for a reservation. Find another one hoping
1006                                  * all vifs assigned to it will also switch
1007                                  * soon enough.
1008                                  *
1009                                  * TODO: This needs a little more work as some
1010                                  * cases (more than 2 chanctx capable devices)
1011                                  * may fail which could otherwise succeed
1012                                  * provided some channel context juggling was
1013                                  * performed.
1014                                  *
1015                                  * Consider ctx1..3, vif1..6, each ctx has 2
1016                                  * vifs. vif1 and vif2 from ctx1 request new
1017                                  * different chandefs starting 2 in-place
1018                                  * reserations with ctx4 and ctx5 replacing
1019                                  * ctx1 and ctx2 respectively. Next vif5 and
1020                                  * vif6 from ctx3 reserve ctx4. If vif3 and
1021                                  * vif4 remain on ctx2 as they are then this
1022                                  * fails unless `replace_ctx` from ctx5 is
1023                                  * replaced with ctx3.
1024                                  */
1025                                 list_for_each_entry(ctx, &local->chanctx_list,
1026                                                     list) {
1027                                         if (ctx->replace_state !=
1028                                             IEEE80211_CHANCTX_REPLACE_NONE)
1029                                                 continue;
1030
1031                                         if (!list_empty(&ctx->reserved_vifs))
1032                                                 continue;
1033
1034                                         curr_ctx = ctx;
1035                                         break;
1036                                 }
1037                         }
1038
1039                         /*
1040                          * If that's true then all available contexts already
1041                          * have reservations and cannot be used.
1042                          */
1043                         if (!curr_ctx ||
1044                             (curr_ctx->replace_state ==
1045                              IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1046                             !list_empty(&curr_ctx->reserved_vifs))
1047                                 return -EBUSY;
1048
1049                         new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
1050                         if (!new_ctx)
1051                                 return -ENOMEM;
1052
1053                         new_ctx->replace_ctx = curr_ctx;
1054                         new_ctx->replace_state =
1055                                         IEEE80211_CHANCTX_REPLACES_OTHER;
1056
1057                         curr_ctx->replace_ctx = new_ctx;
1058                         curr_ctx->replace_state =
1059                                         IEEE80211_CHANCTX_WILL_BE_REPLACED;
1060
1061                         list_add_rcu(&new_ctx->list, &local->chanctx_list);
1062                 }
1063         }
1064
1065         list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
1066         sdata->reserved_chanctx = new_ctx;
1067         sdata->reserved_chandef = *chandef;
1068         sdata->reserved_radar_required = radar_required;
1069         sdata->reserved_ready = false;
1070
1071         return 0;
1072 }
1073
1074 static void
1075 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
1076 {
1077         switch (sdata->vif.type) {
1078         case NL80211_IFTYPE_ADHOC:
1079         case NL80211_IFTYPE_AP:
1080         case NL80211_IFTYPE_MESH_POINT:
1081         case NL80211_IFTYPE_OCB:
1082                 ieee80211_queue_work(&sdata->local->hw,
1083                                      &sdata->csa_finalize_work);
1084                 break;
1085         case NL80211_IFTYPE_STATION:
1086                 ieee80211_queue_work(&sdata->local->hw,
1087                                      &sdata->u.mgd.chswitch_work);
1088                 break;
1089         case NL80211_IFTYPE_UNSPECIFIED:
1090         case NL80211_IFTYPE_AP_VLAN:
1091         case NL80211_IFTYPE_WDS:
1092         case NL80211_IFTYPE_MONITOR:
1093         case NL80211_IFTYPE_P2P_CLIENT:
1094         case NL80211_IFTYPE_P2P_GO:
1095         case NL80211_IFTYPE_P2P_DEVICE:
1096         case NL80211_IFTYPE_NAN:
1097         case NUM_NL80211_IFTYPES:
1098                 WARN_ON(1);
1099                 break;
1100         }
1101 }
1102
1103 static void
1104 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
1105                              const struct cfg80211_chan_def *chandef)
1106 {
1107         struct ieee80211_sub_if_data *vlan;
1108
1109         sdata->vif.bss_conf.chandef = *chandef;
1110
1111         if (sdata->vif.type != NL80211_IFTYPE_AP)
1112                 return;
1113
1114         list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1115                 vlan->vif.bss_conf.chandef = *chandef;
1116 }
1117
1118 static int
1119 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1120 {
1121         struct ieee80211_local *local = sdata->local;
1122         struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1123         struct ieee80211_chanctx *old_ctx, *new_ctx;
1124         const struct cfg80211_chan_def *chandef;
1125         u32 changed = 0;
1126         int err;
1127
1128         lockdep_assert_held(&local->mtx);
1129         lockdep_assert_held(&local->chanctx_mtx);
1130
1131         new_ctx = sdata->reserved_chanctx;
1132         old_ctx = ieee80211_vif_get_chanctx(sdata);
1133
1134         if (WARN_ON(!sdata->reserved_ready))
1135                 return -EBUSY;
1136
1137         if (WARN_ON(!new_ctx))
1138                 return -EINVAL;
1139
1140         if (WARN_ON(!old_ctx))
1141                 return -EINVAL;
1142
1143         if (WARN_ON(new_ctx->replace_state ==
1144                     IEEE80211_CHANCTX_REPLACES_OTHER))
1145                 return -EINVAL;
1146
1147         chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1148                                 &sdata->reserved_chandef);
1149         if (WARN_ON(!chandef))
1150                 return -EINVAL;
1151
1152         if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1153                 changed = BSS_CHANGED_BANDWIDTH;
1154
1155         ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1156
1157         ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef);
1158
1159         vif_chsw[0].vif = &sdata->vif;
1160         vif_chsw[0].old_ctx = &old_ctx->conf;
1161         vif_chsw[0].new_ctx = &new_ctx->conf;
1162
1163         list_del(&sdata->reserved_chanctx_list);
1164         sdata->reserved_chanctx = NULL;
1165
1166         err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1167                                      CHANCTX_SWMODE_REASSIGN_VIF);
1168         if (err) {
1169                 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1170                         ieee80211_free_chanctx(local, new_ctx);
1171
1172                 goto out;
1173         }
1174
1175         list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1176         rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1177
1178         if (sdata->vif.type == NL80211_IFTYPE_AP)
1179                 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1180
1181         ieee80211_check_fast_xmit_iface(sdata);
1182
1183         if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1184                 ieee80211_free_chanctx(local, old_ctx);
1185
1186         ieee80211_recalc_chanctx_min_def(local, new_ctx);
1187         ieee80211_recalc_smps_chanctx(local, new_ctx);
1188         ieee80211_recalc_radar_chanctx(local, new_ctx);
1189
1190         if (changed)
1191                 ieee80211_bss_info_change_notify(sdata, changed);
1192
1193 out:
1194         ieee80211_vif_chanctx_reservation_complete(sdata);
1195         return err;
1196 }
1197
1198 static int
1199 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1200 {
1201         struct ieee80211_local *local = sdata->local;
1202         struct ieee80211_chanctx *old_ctx, *new_ctx;
1203         const struct cfg80211_chan_def *chandef;
1204         int err;
1205
1206         old_ctx = ieee80211_vif_get_chanctx(sdata);
1207         new_ctx = sdata->reserved_chanctx;
1208
1209         if (WARN_ON(!sdata->reserved_ready))
1210                 return -EINVAL;
1211
1212         if (WARN_ON(old_ctx))
1213                 return -EINVAL;
1214
1215         if (WARN_ON(!new_ctx))
1216                 return -EINVAL;
1217
1218         if (WARN_ON(new_ctx->replace_state ==
1219                     IEEE80211_CHANCTX_REPLACES_OTHER))
1220                 return -EINVAL;
1221
1222         chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1223                                 &sdata->reserved_chandef);
1224         if (WARN_ON(!chandef))
1225                 return -EINVAL;
1226
1227         ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
1228
1229         list_del(&sdata->reserved_chanctx_list);
1230         sdata->reserved_chanctx = NULL;
1231
1232         err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1233         if (err) {
1234                 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1235                         ieee80211_free_chanctx(local, new_ctx);
1236
1237                 goto out;
1238         }
1239
1240 out:
1241         ieee80211_vif_chanctx_reservation_complete(sdata);
1242         return err;
1243 }
1244
1245 static bool
1246 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1247 {
1248         struct ieee80211_chanctx *old_ctx, *new_ctx;
1249
1250         lockdep_assert_held(&sdata->local->chanctx_mtx);
1251
1252         new_ctx = sdata->reserved_chanctx;
1253         old_ctx = ieee80211_vif_get_chanctx(sdata);
1254
1255         if (!old_ctx)
1256                 return false;
1257
1258         if (WARN_ON(!new_ctx))
1259                 return false;
1260
1261         if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1262                 return false;
1263
1264         if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1265                 return false;
1266
1267         return true;
1268 }
1269
1270 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1271                                         struct ieee80211_chanctx *new_ctx)
1272 {
1273         const struct cfg80211_chan_def *chandef;
1274
1275         lockdep_assert_held(&local->mtx);
1276         lockdep_assert_held(&local->chanctx_mtx);
1277
1278         chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1279         if (WARN_ON(!chandef))
1280                 return -EINVAL;
1281
1282         local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1283         local->_oper_chandef = *chandef;
1284         ieee80211_hw_config(local, 0);
1285
1286         return 0;
1287 }
1288
1289 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1290                                       int n_vifs)
1291 {
1292         struct ieee80211_vif_chanctx_switch *vif_chsw;
1293         struct ieee80211_sub_if_data *sdata;
1294         struct ieee80211_chanctx *ctx, *old_ctx;
1295         int i, err;
1296
1297         lockdep_assert_held(&local->mtx);
1298         lockdep_assert_held(&local->chanctx_mtx);
1299
1300         vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1301         if (!vif_chsw)
1302                 return -ENOMEM;
1303
1304         i = 0;
1305         list_for_each_entry(ctx, &local->chanctx_list, list) {
1306                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1307                         continue;
1308
1309                 if (WARN_ON(!ctx->replace_ctx)) {
1310                         err = -EINVAL;
1311                         goto out;
1312                 }
1313
1314                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1315                                     reserved_chanctx_list) {
1316                         if (!ieee80211_vif_has_in_place_reservation(
1317                                         sdata))
1318                                 continue;
1319
1320                         old_ctx = ieee80211_vif_get_chanctx(sdata);
1321                         vif_chsw[i].vif = &sdata->vif;
1322                         vif_chsw[i].old_ctx = &old_ctx->conf;
1323                         vif_chsw[i].new_ctx = &ctx->conf;
1324
1325                         i++;
1326                 }
1327         }
1328
1329         err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1330                                      CHANCTX_SWMODE_SWAP_CONTEXTS);
1331
1332 out:
1333         kfree(vif_chsw);
1334         return err;
1335 }
1336
1337 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1338 {
1339         struct ieee80211_chanctx *ctx;
1340         int err;
1341
1342         lockdep_assert_held(&local->mtx);
1343         lockdep_assert_held(&local->chanctx_mtx);
1344
1345         list_for_each_entry(ctx, &local->chanctx_list, list) {
1346                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1347                         continue;
1348
1349                 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1350                         continue;
1351
1352                 ieee80211_del_chanctx(local, ctx->replace_ctx);
1353                 err = ieee80211_add_chanctx(local, ctx);
1354                 if (err)
1355                         goto err;
1356         }
1357
1358         return 0;
1359
1360 err:
1361         WARN_ON(ieee80211_add_chanctx(local, ctx));
1362         list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1363                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1364                         continue;
1365
1366                 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1367                         continue;
1368
1369                 ieee80211_del_chanctx(local, ctx);
1370                 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1371         }
1372
1373         return err;
1374 }
1375
1376 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1377 {
1378         struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1379         struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1380         struct ieee80211_chanctx *new_ctx = NULL;
1381         int err, n_assigned, n_reserved, n_ready;
1382         int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1383
1384         lockdep_assert_held(&local->mtx);
1385         lockdep_assert_held(&local->chanctx_mtx);
1386
1387         /*
1388          * If there are 2 independent pairs of channel contexts performing
1389          * cross-switch of their vifs this code will still wait until both are
1390          * ready even though it could be possible to switch one before the
1391          * other is ready.
1392          *
1393          * For practical reasons and code simplicity just do a single huge
1394          * switch.
1395          */
1396
1397         /*
1398          * Verify if the reservation is still feasible.
1399          *  - if it's not then disconnect
1400          *  - if it is but not all vifs necessary are ready then defer
1401          */
1402
1403         list_for_each_entry(ctx, &local->chanctx_list, list) {
1404                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1405                         continue;
1406
1407                 if (WARN_ON(!ctx->replace_ctx)) {
1408                         err = -EINVAL;
1409                         goto err;
1410                 }
1411
1412                 if (!local->use_chanctx)
1413                         new_ctx = ctx;
1414
1415                 n_ctx++;
1416
1417                 n_assigned = 0;
1418                 n_reserved = 0;
1419                 n_ready = 0;
1420
1421                 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1422                                     assigned_chanctx_list) {
1423                         n_assigned++;
1424                         if (sdata->reserved_chanctx) {
1425                                 n_reserved++;
1426                                 if (sdata->reserved_ready)
1427                                         n_ready++;
1428                         }
1429                 }
1430
1431                 if (n_assigned != n_reserved) {
1432                         if (n_ready == n_reserved) {
1433                                 wiphy_info(local->hw.wiphy,
1434                                            "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1435                                 err = -EBUSY;
1436                                 goto err;
1437                         }
1438
1439                         return -EAGAIN;
1440                 }
1441
1442                 ctx->conf.radar_enabled = false;
1443                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1444                                     reserved_chanctx_list) {
1445                         if (ieee80211_vif_has_in_place_reservation(sdata) &&
1446                             !sdata->reserved_ready)
1447                                 return -EAGAIN;
1448
1449                         old_ctx = ieee80211_vif_get_chanctx(sdata);
1450                         if (old_ctx) {
1451                                 if (old_ctx->replace_state ==
1452                                     IEEE80211_CHANCTX_WILL_BE_REPLACED)
1453                                         n_vifs_switch++;
1454                                 else
1455                                         n_vifs_assign++;
1456                         } else {
1457                                 n_vifs_ctxless++;
1458                         }
1459
1460                         if (sdata->reserved_radar_required)
1461                                 ctx->conf.radar_enabled = true;
1462                 }
1463         }
1464
1465         if (WARN_ON(n_ctx == 0) ||
1466             WARN_ON(n_vifs_switch == 0 &&
1467                     n_vifs_assign == 0 &&
1468                     n_vifs_ctxless == 0) ||
1469             WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1470             WARN_ON(!new_ctx && !local->use_chanctx)) {
1471                 err = -EINVAL;
1472                 goto err;
1473         }
1474
1475         /*
1476          * All necessary vifs are ready. Perform the switch now depending on
1477          * reservations and driver capabilities.
1478          */
1479
1480         if (local->use_chanctx) {
1481                 if (n_vifs_switch > 0) {
1482                         err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1483                         if (err)
1484                                 goto err;
1485                 }
1486
1487                 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1488                         err = ieee80211_chsw_switch_ctxs(local);
1489                         if (err)
1490                                 goto err;
1491                 }
1492         } else {
1493                 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1494                 if (err)
1495                         goto err;
1496         }
1497
1498         /*
1499          * Update all structures, values and pointers to point to new channel
1500          * context(s).
1501          */
1502         list_for_each_entry(ctx, &local->chanctx_list, list) {
1503                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1504                         continue;
1505
1506                 if (WARN_ON(!ctx->replace_ctx)) {
1507                         err = -EINVAL;
1508                         goto err;
1509                 }
1510
1511                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1512                                     reserved_chanctx_list) {
1513                         u32 changed = 0;
1514
1515                         if (!ieee80211_vif_has_in_place_reservation(sdata))
1516                                 continue;
1517
1518                         rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1519
1520                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1521                                 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1522                                                                       false);
1523
1524                         ieee80211_check_fast_xmit_iface(sdata);
1525
1526                         sdata->radar_required = sdata->reserved_radar_required;
1527
1528                         if (sdata->vif.bss_conf.chandef.width !=
1529                             sdata->reserved_chandef.width)
1530                                 changed = BSS_CHANGED_BANDWIDTH;
1531
1532                         ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1533                         if (changed)
1534                                 ieee80211_bss_info_change_notify(sdata,
1535                                                                  changed);
1536
1537                         ieee80211_recalc_txpower(sdata, false);
1538                 }
1539
1540                 ieee80211_recalc_chanctx_chantype(local, ctx);
1541                 ieee80211_recalc_smps_chanctx(local, ctx);
1542                 ieee80211_recalc_radar_chanctx(local, ctx);
1543                 ieee80211_recalc_chanctx_min_def(local, ctx);
1544
1545                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1546                                          reserved_chanctx_list) {
1547                         if (ieee80211_vif_get_chanctx(sdata) != ctx)
1548                                 continue;
1549
1550                         list_del(&sdata->reserved_chanctx_list);
1551                         list_move(&sdata->assigned_chanctx_list,
1552                                   &ctx->assigned_vifs);
1553                         sdata->reserved_chanctx = NULL;
1554
1555                         ieee80211_vif_chanctx_reservation_complete(sdata);
1556                 }
1557
1558                 /*
1559                  * This context might have been a dependency for an already
1560                  * ready re-assign reservation interface that was deferred. Do
1561                  * not propagate error to the caller though. The in-place
1562                  * reservation for originally requested interface has already
1563                  * succeeded at this point.
1564                  */
1565                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1566                                          reserved_chanctx_list) {
1567                         if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1568                                         sdata)))
1569                                 continue;
1570
1571                         if (WARN_ON(sdata->reserved_chanctx != ctx))
1572                                 continue;
1573
1574                         if (!sdata->reserved_ready)
1575                                 continue;
1576
1577                         if (ieee80211_vif_get_chanctx(sdata))
1578                                 err = ieee80211_vif_use_reserved_reassign(
1579                                                 sdata);
1580                         else
1581                                 err = ieee80211_vif_use_reserved_assign(sdata);
1582
1583                         if (err) {
1584                                 sdata_info(sdata,
1585                                            "failed to finalize (re-)assign reservation (err=%d)\n",
1586                                            err);
1587                                 ieee80211_vif_unreserve_chanctx(sdata);
1588                                 cfg80211_stop_iface(local->hw.wiphy,
1589                                                     &sdata->wdev,
1590                                                     GFP_KERNEL);
1591                         }
1592                 }
1593         }
1594
1595         /*
1596          * Finally free old contexts
1597          */
1598
1599         list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1600                 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1601                         continue;
1602
1603                 ctx->replace_ctx->replace_ctx = NULL;
1604                 ctx->replace_ctx->replace_state =
1605                                 IEEE80211_CHANCTX_REPLACE_NONE;
1606
1607                 list_del_rcu(&ctx->list);
1608                 kfree_rcu(ctx, rcu_head);
1609         }
1610
1611         return 0;
1612
1613 err:
1614         list_for_each_entry(ctx, &local->chanctx_list, list) {
1615                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1616                         continue;
1617
1618                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1619                                          reserved_chanctx_list) {
1620                         ieee80211_vif_unreserve_chanctx(sdata);
1621                         ieee80211_vif_chanctx_reservation_complete(sdata);
1622                 }
1623         }
1624
1625         return err;
1626 }
1627
1628 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1629 {
1630         struct ieee80211_local *local = sdata->local;
1631         struct ieee80211_chanctx_conf *conf;
1632         struct ieee80211_chanctx *ctx;
1633         bool use_reserved_switch = false;
1634
1635         lockdep_assert_held(&local->chanctx_mtx);
1636
1637         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1638                                          lockdep_is_held(&local->chanctx_mtx));
1639         if (!conf)
1640                 return;
1641
1642         ctx = container_of(conf, struct ieee80211_chanctx, conf);
1643
1644         if (sdata->reserved_chanctx) {
1645                 if (sdata->reserved_chanctx->replace_state ==
1646                     IEEE80211_CHANCTX_REPLACES_OTHER &&
1647                     ieee80211_chanctx_num_reserved(local,
1648                                                    sdata->reserved_chanctx) > 1)
1649                         use_reserved_switch = true;
1650
1651                 ieee80211_vif_unreserve_chanctx(sdata);
1652         }
1653
1654         ieee80211_assign_vif_chanctx(sdata, NULL);
1655         if (ieee80211_chanctx_refcount(local, ctx) == 0)
1656                 ieee80211_free_chanctx(local, ctx);
1657
1658         sdata->radar_required = false;
1659
1660         /* Unreserving may ready an in-place reservation. */
1661         if (use_reserved_switch)
1662                 ieee80211_vif_use_reserved_switch(local);
1663 }
1664
1665 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1666                               const struct cfg80211_chan_def *chandef,
1667                               enum ieee80211_chanctx_mode mode)
1668 {
1669         struct ieee80211_local *local = sdata->local;
1670         struct ieee80211_chanctx *ctx;
1671         u8 radar_detect_width = 0;
1672         int ret;
1673
1674         lockdep_assert_held(&local->mtx);
1675
1676         WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1677
1678         mutex_lock(&local->chanctx_mtx);
1679
1680         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1681                                             chandef,
1682                                             sdata->wdev.iftype);
1683         if (ret < 0)
1684                 goto out;
1685         if (ret > 0)
1686                 radar_detect_width = BIT(chandef->width);
1687
1688         sdata->radar_required = ret;
1689
1690         ret = ieee80211_check_combinations(sdata, chandef, mode,
1691                                            radar_detect_width);
1692         if (ret < 0)
1693                 goto out;
1694
1695         __ieee80211_vif_release_channel(sdata);
1696
1697         ctx = ieee80211_find_chanctx(local, chandef, mode);
1698         if (!ctx)
1699                 ctx = ieee80211_new_chanctx(local, chandef, mode);
1700         if (IS_ERR(ctx)) {
1701                 ret = PTR_ERR(ctx);
1702                 goto out;
1703         }
1704
1705         ieee80211_vif_update_chandef(sdata, chandef);
1706
1707         ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1708         if (ret) {
1709                 /* if assign fails refcount stays the same */
1710                 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1711                         ieee80211_free_chanctx(local, ctx);
1712                 goto out;
1713         }
1714
1715         ieee80211_recalc_smps_chanctx(local, ctx);
1716         ieee80211_recalc_radar_chanctx(local, ctx);
1717  out:
1718         if (ret)
1719                 sdata->radar_required = false;
1720
1721         mutex_unlock(&local->chanctx_mtx);
1722         return ret;
1723 }
1724
1725 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1726 {
1727         struct ieee80211_local *local = sdata->local;
1728         struct ieee80211_chanctx *new_ctx;
1729         struct ieee80211_chanctx *old_ctx;
1730         int err;
1731
1732         lockdep_assert_held(&local->mtx);
1733         lockdep_assert_held(&local->chanctx_mtx);
1734
1735         new_ctx = sdata->reserved_chanctx;
1736         old_ctx = ieee80211_vif_get_chanctx(sdata);
1737
1738         if (WARN_ON(!new_ctx))
1739                 return -EINVAL;
1740
1741         if (WARN_ON(new_ctx->replace_state ==
1742                     IEEE80211_CHANCTX_WILL_BE_REPLACED))
1743                 return -EINVAL;
1744
1745         if (WARN_ON(sdata->reserved_ready))
1746                 return -EINVAL;
1747
1748         sdata->reserved_ready = true;
1749
1750         if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1751                 if (old_ctx)
1752                         return ieee80211_vif_use_reserved_reassign(sdata);
1753
1754                 return ieee80211_vif_use_reserved_assign(sdata);
1755         }
1756
1757         /*
1758          * In-place reservation may need to be finalized now either if:
1759          *  a) sdata is taking part in the swapping itself and is the last one
1760          *  b) sdata has switched with a re-assign reservation to an existing
1761          *     context readying in-place switching of old_ctx
1762          *
1763          * In case of (b) do not propagate the error up because the requested
1764          * sdata already switched successfully. Just spill an extra warning.
1765          * The ieee80211_vif_use_reserved_switch() already stops all necessary
1766          * interfaces upon failure.
1767          */
1768         if ((old_ctx &&
1769              old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1770             new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1771                 err = ieee80211_vif_use_reserved_switch(local);
1772                 if (err && err != -EAGAIN) {
1773                         if (new_ctx->replace_state ==
1774                             IEEE80211_CHANCTX_REPLACES_OTHER)
1775                                 return err;
1776
1777                         wiphy_info(local->hw.wiphy,
1778                                    "depending in-place reservation failed (err=%d)\n",
1779                                    err);
1780                 }
1781         }
1782
1783         return 0;
1784 }
1785
1786 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1787                                    const struct cfg80211_chan_def *chandef,
1788                                    u32 *changed)
1789 {
1790         struct ieee80211_local *local = sdata->local;
1791         struct ieee80211_chanctx_conf *conf;
1792         struct ieee80211_chanctx *ctx;
1793         const struct cfg80211_chan_def *compat;
1794         int ret;
1795
1796         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1797                                      IEEE80211_CHAN_DISABLED))
1798                 return -EINVAL;
1799
1800         mutex_lock(&local->chanctx_mtx);
1801         if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1802                 ret = 0;
1803                 goto out;
1804         }
1805
1806         if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1807             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1808                 ret = -EINVAL;
1809                 goto out;
1810         }
1811
1812         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1813                                          lockdep_is_held(&local->chanctx_mtx));
1814         if (!conf) {
1815                 ret = -EINVAL;
1816                 goto out;
1817         }
1818
1819         ctx = container_of(conf, struct ieee80211_chanctx, conf);
1820
1821         compat = cfg80211_chandef_compatible(&conf->def, chandef);
1822         if (!compat) {
1823                 ret = -EINVAL;
1824                 goto out;
1825         }
1826
1827         switch (ctx->replace_state) {
1828         case IEEE80211_CHANCTX_REPLACE_NONE:
1829                 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1830                         ret = -EBUSY;
1831                         goto out;
1832                 }
1833                 break;
1834         case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1835                 /* TODO: Perhaps the bandwidth change could be treated as a
1836                  * reservation itself? */
1837                 ret = -EBUSY;
1838                 goto out;
1839         case IEEE80211_CHANCTX_REPLACES_OTHER:
1840                 /* channel context that is going to replace another channel
1841                  * context doesn't really exist and shouldn't be assigned
1842                  * anywhere yet */
1843                 WARN_ON(1);
1844                 break;
1845         }
1846
1847         ieee80211_vif_update_chandef(sdata, chandef);
1848
1849         ieee80211_recalc_chanctx_chantype(local, ctx);
1850
1851         *changed |= BSS_CHANGED_BANDWIDTH;
1852         ret = 0;
1853  out:
1854         mutex_unlock(&local->chanctx_mtx);
1855         return ret;
1856 }
1857
1858 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1859 {
1860         WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1861
1862         lockdep_assert_held(&sdata->local->mtx);
1863
1864         mutex_lock(&sdata->local->chanctx_mtx);
1865         __ieee80211_vif_release_channel(sdata);
1866         mutex_unlock(&sdata->local->chanctx_mtx);
1867 }
1868
1869 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1870 {
1871         struct ieee80211_local *local = sdata->local;
1872         struct ieee80211_sub_if_data *ap;
1873         struct ieee80211_chanctx_conf *conf;
1874
1875         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1876                 return;
1877
1878         ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1879
1880         mutex_lock(&local->chanctx_mtx);
1881
1882         conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1883                                          lockdep_is_held(&local->chanctx_mtx));
1884         rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1885         mutex_unlock(&local->chanctx_mtx);
1886 }
1887
1888 void ieee80211_iter_chan_contexts_atomic(
1889         struct ieee80211_hw *hw,
1890         void (*iter)(struct ieee80211_hw *hw,
1891                      struct ieee80211_chanctx_conf *chanctx_conf,
1892                      void *data),
1893         void *iter_data)
1894 {
1895         struct ieee80211_local *local = hw_to_local(hw);
1896         struct ieee80211_chanctx *ctx;
1897
1898         rcu_read_lock();
1899         list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1900                 if (ctx->driver_present)
1901                         iter(hw, &ctx->conf, iter_data);
1902         rcu_read_unlock();
1903 }
1904 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);