2 * mac80211 - channel management
5 #include <linux/nl80211.h>
6 #include <linux/export.h>
7 #include <linux/rtnetlink.h>
8 #include <net/cfg80211.h>
9 #include "ieee80211_i.h"
10 #include "driver-ops.h"
12 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
13 struct ieee80211_chanctx *ctx)
15 struct ieee80211_sub_if_data *sdata;
18 lockdep_assert_held(&local->chanctx_mtx);
20 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
26 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
27 struct ieee80211_chanctx *ctx)
29 struct ieee80211_sub_if_data *sdata;
32 lockdep_assert_held(&local->chanctx_mtx);
34 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
40 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
41 struct ieee80211_chanctx *ctx)
43 return ieee80211_chanctx_num_assigned(local, ctx) +
44 ieee80211_chanctx_num_reserved(local, ctx);
47 static int ieee80211_num_chanctx(struct ieee80211_local *local)
49 struct ieee80211_chanctx *ctx;
52 lockdep_assert_held(&local->chanctx_mtx);
54 list_for_each_entry(ctx, &local->chanctx_list, list)
60 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
62 lockdep_assert_held(&local->chanctx_mtx);
63 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
66 static struct ieee80211_chanctx *
67 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
69 struct ieee80211_local *local __maybe_unused = sdata->local;
70 struct ieee80211_chanctx_conf *conf;
72 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
73 lockdep_is_held(&local->chanctx_mtx));
77 return container_of(conf, struct ieee80211_chanctx, conf);
80 static const struct cfg80211_chan_def *
81 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
82 struct ieee80211_chanctx *ctx,
83 const struct cfg80211_chan_def *compat)
85 struct ieee80211_sub_if_data *sdata;
87 lockdep_assert_held(&local->chanctx_mtx);
89 list_for_each_entry(sdata, &ctx->reserved_vifs,
90 reserved_chanctx_list) {
92 compat = &sdata->reserved_chandef;
94 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
103 static const struct cfg80211_chan_def *
104 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
105 struct ieee80211_chanctx *ctx,
106 const struct cfg80211_chan_def *compat)
108 struct ieee80211_sub_if_data *sdata;
110 lockdep_assert_held(&local->chanctx_mtx);
112 list_for_each_entry(sdata, &ctx->assigned_vifs,
113 assigned_chanctx_list) {
114 if (sdata->reserved_chanctx != NULL)
118 compat = &sdata->vif.bss_conf.chandef;
120 compat = cfg80211_chandef_compatible(
121 &sdata->vif.bss_conf.chandef, compat);
129 static const struct cfg80211_chan_def *
130 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
131 struct ieee80211_chanctx *ctx,
132 const struct cfg80211_chan_def *compat)
134 lockdep_assert_held(&local->chanctx_mtx);
136 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
140 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
148 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
149 struct ieee80211_chanctx *ctx,
150 const struct cfg80211_chan_def *def)
152 lockdep_assert_held(&local->chanctx_mtx);
154 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
157 if (!list_empty(&ctx->reserved_vifs) &&
158 ieee80211_chanctx_reserved_chandef(local, ctx, def))
164 static struct ieee80211_chanctx *
165 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
166 const struct cfg80211_chan_def *chandef,
167 enum ieee80211_chanctx_mode mode)
169 struct ieee80211_chanctx *ctx;
171 lockdep_assert_held(&local->chanctx_mtx);
173 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
176 list_for_each_entry(ctx, &local->chanctx_list, list) {
177 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
180 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
183 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
193 static enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
195 switch (sta->bandwidth) {
196 case IEEE80211_STA_RX_BW_20:
197 if (sta->ht_cap.ht_supported)
198 return NL80211_CHAN_WIDTH_20;
200 return NL80211_CHAN_WIDTH_20_NOHT;
201 case IEEE80211_STA_RX_BW_40:
202 return NL80211_CHAN_WIDTH_40;
203 case IEEE80211_STA_RX_BW_80:
204 return NL80211_CHAN_WIDTH_80;
205 case IEEE80211_STA_RX_BW_160:
207 * This applied for both 160 and 80+80. since we use
208 * the returned value to consider degradation of
209 * ctx->conf.min_def, we have to make sure to take
210 * the bigger one (NL80211_CHAN_WIDTH_160).
211 * Otherwise we might try degrading even when not
212 * needed, as the max required sta_bw returned (80+80)
213 * might be smaller than the configured bw (160).
215 return NL80211_CHAN_WIDTH_160;
218 return NL80211_CHAN_WIDTH_20;
222 static enum nl80211_chan_width
223 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
225 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
226 struct sta_info *sta;
229 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
230 if (sdata != sta->sdata &&
231 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
237 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
244 static enum nl80211_chan_width
245 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
246 struct ieee80211_chanctx_conf *conf)
248 struct ieee80211_sub_if_data *sdata;
249 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
252 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
253 struct ieee80211_vif *vif = &sdata->vif;
254 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
256 if (!ieee80211_sdata_running(sdata))
259 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
263 case NL80211_IFTYPE_AP:
264 case NL80211_IFTYPE_AP_VLAN:
265 width = ieee80211_get_max_required_bw(sdata);
267 case NL80211_IFTYPE_P2P_DEVICE:
269 case NL80211_IFTYPE_STATION:
270 case NL80211_IFTYPE_ADHOC:
271 case NL80211_IFTYPE_WDS:
272 case NL80211_IFTYPE_MESH_POINT:
273 case NL80211_IFTYPE_OCB:
274 width = vif->bss_conf.chandef.width;
276 case NL80211_IFTYPE_UNSPECIFIED:
277 case NUM_NL80211_IFTYPES:
278 case NL80211_IFTYPE_MONITOR:
279 case NL80211_IFTYPE_P2P_CLIENT:
280 case NL80211_IFTYPE_P2P_GO:
283 max_bw = max(max_bw, width);
286 /* use the configured bandwidth in case of monitor interface */
287 sdata = rcu_dereference(local->monitor_sdata);
288 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
289 max_bw = max(max_bw, conf->def.width);
297 * recalc the min required chan width of the channel context, which is
298 * the max of min required widths of all the interfaces bound to this
301 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
302 struct ieee80211_chanctx *ctx)
304 enum nl80211_chan_width max_bw;
305 struct cfg80211_chan_def min_def;
307 lockdep_assert_held(&local->chanctx_mtx);
309 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
310 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
311 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
312 ctx->conf.radar_enabled) {
313 ctx->conf.min_def = ctx->conf.def;
317 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
319 /* downgrade chandef up to max_bw */
320 min_def = ctx->conf.def;
321 while (min_def.width > max_bw)
322 ieee80211_chandef_downgrade(&min_def);
324 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
327 ctx->conf.min_def = min_def;
328 if (!ctx->driver_present)
331 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
334 static void ieee80211_change_chanctx(struct ieee80211_local *local,
335 struct ieee80211_chanctx *ctx,
336 const struct cfg80211_chan_def *chandef)
338 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
341 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
343 ctx->conf.def = *chandef;
344 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
345 ieee80211_recalc_chanctx_min_def(local, ctx);
347 if (!local->use_chanctx) {
348 local->_oper_chandef = *chandef;
349 ieee80211_hw_config(local, 0);
353 static struct ieee80211_chanctx *
354 ieee80211_find_chanctx(struct ieee80211_local *local,
355 const struct cfg80211_chan_def *chandef,
356 enum ieee80211_chanctx_mode mode)
358 struct ieee80211_chanctx *ctx;
360 lockdep_assert_held(&local->chanctx_mtx);
362 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
365 list_for_each_entry(ctx, &local->chanctx_list, list) {
366 const struct cfg80211_chan_def *compat;
368 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
371 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
374 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
378 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
383 ieee80211_change_chanctx(local, ctx, compat);
391 static bool ieee80211_is_radar_required(struct ieee80211_local *local)
393 struct ieee80211_sub_if_data *sdata;
395 lockdep_assert_held(&local->mtx);
398 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
399 if (sdata->radar_required) {
409 static struct ieee80211_chanctx *
410 ieee80211_alloc_chanctx(struct ieee80211_local *local,
411 const struct cfg80211_chan_def *chandef,
412 enum ieee80211_chanctx_mode mode)
414 struct ieee80211_chanctx *ctx;
416 lockdep_assert_held(&local->chanctx_mtx);
418 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
422 INIT_LIST_HEAD(&ctx->assigned_vifs);
423 INIT_LIST_HEAD(&ctx->reserved_vifs);
424 ctx->conf.def = *chandef;
425 ctx->conf.rx_chains_static = 1;
426 ctx->conf.rx_chains_dynamic = 1;
428 ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
429 ieee80211_recalc_chanctx_min_def(local, ctx);
434 static int ieee80211_add_chanctx(struct ieee80211_local *local,
435 struct ieee80211_chanctx *ctx)
440 lockdep_assert_held(&local->mtx);
441 lockdep_assert_held(&local->chanctx_mtx);
443 if (!local->use_chanctx)
444 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
446 /* turn idle off *before* setting channel -- some drivers need that */
447 changed = ieee80211_idle_off(local);
449 ieee80211_hw_config(local, changed);
451 if (!local->use_chanctx) {
452 local->_oper_chandef = ctx->conf.def;
453 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
455 err = drv_add_chanctx(local, ctx);
457 ieee80211_recalc_idle(local);
465 static struct ieee80211_chanctx *
466 ieee80211_new_chanctx(struct ieee80211_local *local,
467 const struct cfg80211_chan_def *chandef,
468 enum ieee80211_chanctx_mode mode)
470 struct ieee80211_chanctx *ctx;
473 lockdep_assert_held(&local->mtx);
474 lockdep_assert_held(&local->chanctx_mtx);
476 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
478 return ERR_PTR(-ENOMEM);
480 err = ieee80211_add_chanctx(local, ctx);
486 list_add_rcu(&ctx->list, &local->chanctx_list);
490 static void ieee80211_del_chanctx(struct ieee80211_local *local,
491 struct ieee80211_chanctx *ctx)
493 lockdep_assert_held(&local->chanctx_mtx);
495 if (!local->use_chanctx) {
496 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
497 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
498 chandef->center_freq1 = chandef->chan->center_freq;
499 chandef->center_freq2 = 0;
501 /* NOTE: Disabling radar is only valid here for
502 * single channel context. To be sure, check it ...
504 WARN_ON(local->hw.conf.radar_enabled &&
505 !list_empty(&local->chanctx_list));
507 local->hw.conf.radar_enabled = false;
509 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
511 drv_remove_chanctx(local, ctx);
514 ieee80211_recalc_idle(local);
517 static void ieee80211_free_chanctx(struct ieee80211_local *local,
518 struct ieee80211_chanctx *ctx)
520 lockdep_assert_held(&local->chanctx_mtx);
522 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
524 list_del_rcu(&ctx->list);
525 ieee80211_del_chanctx(local, ctx);
526 kfree_rcu(ctx, rcu_head);
529 static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
530 struct ieee80211_chanctx *ctx)
532 struct ieee80211_chanctx_conf *conf = &ctx->conf;
533 struct ieee80211_sub_if_data *sdata;
534 const struct cfg80211_chan_def *compat = NULL;
536 lockdep_assert_held(&local->chanctx_mtx);
539 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
541 if (!ieee80211_sdata_running(sdata))
543 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
545 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
549 compat = &sdata->vif.bss_conf.chandef;
551 compat = cfg80211_chandef_compatible(
552 &sdata->vif.bss_conf.chandef, compat);
553 if (WARN_ON_ONCE(!compat))
561 ieee80211_change_chanctx(local, ctx, compat);
564 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
565 struct ieee80211_chanctx *chanctx)
569 lockdep_assert_held(&local->chanctx_mtx);
570 /* for setting local->radar_detect_enabled */
571 lockdep_assert_held(&local->mtx);
573 radar_enabled = ieee80211_is_radar_required(local);
575 if (radar_enabled == chanctx->conf.radar_enabled)
578 chanctx->conf.radar_enabled = radar_enabled;
579 local->radar_detect_enabled = chanctx->conf.radar_enabled;
581 if (!local->use_chanctx) {
582 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
583 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
586 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
589 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
590 struct ieee80211_chanctx *new_ctx)
592 struct ieee80211_local *local = sdata->local;
593 struct ieee80211_chanctx_conf *conf;
594 struct ieee80211_chanctx *curr_ctx = NULL;
597 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
598 lockdep_is_held(&local->chanctx_mtx));
601 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
603 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
605 list_del(&sdata->assigned_chanctx_list);
609 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
613 conf = &new_ctx->conf;
614 list_add(&sdata->assigned_chanctx_list,
615 &new_ctx->assigned_vifs);
619 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
621 sdata->vif.bss_conf.idle = !conf;
623 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
624 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
625 ieee80211_recalc_smps_chanctx(local, curr_ctx);
626 ieee80211_recalc_radar_chanctx(local, curr_ctx);
627 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
630 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
631 ieee80211_recalc_txpower(sdata);
632 ieee80211_recalc_chanctx_min_def(local, new_ctx);
635 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
636 sdata->vif.type != NL80211_IFTYPE_MONITOR)
637 ieee80211_bss_info_change_notify(sdata,
643 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
644 struct ieee80211_chanctx *chanctx)
646 struct ieee80211_sub_if_data *sdata;
647 u8 rx_chains_static, rx_chains_dynamic;
649 lockdep_assert_held(&local->chanctx_mtx);
651 rx_chains_static = 1;
652 rx_chains_dynamic = 1;
655 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
656 u8 needed_static, needed_dynamic;
658 if (!ieee80211_sdata_running(sdata))
661 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
665 switch (sdata->vif.type) {
666 case NL80211_IFTYPE_P2P_DEVICE:
668 case NL80211_IFTYPE_STATION:
669 if (!sdata->u.mgd.associated)
672 case NL80211_IFTYPE_AP_VLAN:
674 case NL80211_IFTYPE_AP:
675 case NL80211_IFTYPE_ADHOC:
676 case NL80211_IFTYPE_WDS:
677 case NL80211_IFTYPE_MESH_POINT:
678 case NL80211_IFTYPE_OCB:
684 switch (sdata->smps_mode) {
686 WARN_ONCE(1, "Invalid SMPS mode %d\n",
689 case IEEE80211_SMPS_OFF:
690 needed_static = sdata->needed_rx_chains;
691 needed_dynamic = sdata->needed_rx_chains;
693 case IEEE80211_SMPS_DYNAMIC:
695 needed_dynamic = sdata->needed_rx_chains;
697 case IEEE80211_SMPS_STATIC:
703 rx_chains_static = max(rx_chains_static, needed_static);
704 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
707 /* Disable SMPS for the monitor interface */
708 sdata = rcu_dereference(local->monitor_sdata);
710 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
711 rx_chains_dynamic = rx_chains_static = local->rx_chains;
715 if (!local->use_chanctx) {
716 if (rx_chains_static > 1)
717 local->smps_mode = IEEE80211_SMPS_OFF;
718 else if (rx_chains_dynamic > 1)
719 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
721 local->smps_mode = IEEE80211_SMPS_STATIC;
722 ieee80211_hw_config(local, 0);
725 if (rx_chains_static == chanctx->conf.rx_chains_static &&
726 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
729 chanctx->conf.rx_chains_static = rx_chains_static;
730 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
731 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
735 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
738 struct ieee80211_local *local __maybe_unused = sdata->local;
739 struct ieee80211_sub_if_data *vlan;
740 struct ieee80211_chanctx_conf *conf;
742 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
745 lockdep_assert_held(&local->mtx);
747 /* Check that conf exists, even when clearing this function
748 * must be called with the AP's channel context still there
749 * as it would otherwise cause VLANs to have an invalid
750 * channel context pointer for a while, possibly pointing
751 * to a channel context that has already been freed.
753 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
754 lockdep_is_held(&local->chanctx_mtx));
760 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
761 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
764 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
767 struct ieee80211_local *local = sdata->local;
769 mutex_lock(&local->chanctx_mtx);
771 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
773 mutex_unlock(&local->chanctx_mtx);
776 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
778 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
780 lockdep_assert_held(&sdata->local->chanctx_mtx);
785 list_del(&sdata->reserved_chanctx_list);
786 sdata->reserved_chanctx = NULL;
788 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
789 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
790 if (WARN_ON(!ctx->replace_ctx))
793 WARN_ON(ctx->replace_ctx->replace_state !=
794 IEEE80211_CHANCTX_WILL_BE_REPLACED);
795 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
797 ctx->replace_ctx->replace_ctx = NULL;
798 ctx->replace_ctx->replace_state =
799 IEEE80211_CHANCTX_REPLACE_NONE;
801 list_del_rcu(&ctx->list);
802 kfree_rcu(ctx, rcu_head);
804 ieee80211_free_chanctx(sdata->local, ctx);
811 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
812 const struct cfg80211_chan_def *chandef,
813 enum ieee80211_chanctx_mode mode,
816 struct ieee80211_local *local = sdata->local;
817 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
819 lockdep_assert_held(&local->chanctx_mtx);
821 curr_ctx = ieee80211_vif_get_chanctx(sdata);
822 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
825 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
827 if (ieee80211_can_create_new_chanctx(local)) {
828 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
830 return PTR_ERR(new_ctx);
833 (curr_ctx->replace_state ==
834 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
835 !list_empty(&curr_ctx->reserved_vifs)) {
837 * Another vif already requested this context
838 * for a reservation. Find another one hoping
839 * all vifs assigned to it will also switch
842 * TODO: This needs a little more work as some
843 * cases (more than 2 chanctx capable devices)
844 * may fail which could otherwise succeed
845 * provided some channel context juggling was
848 * Consider ctx1..3, vif1..6, each ctx has 2
849 * vifs. vif1 and vif2 from ctx1 request new
850 * different chandefs starting 2 in-place
851 * reserations with ctx4 and ctx5 replacing
852 * ctx1 and ctx2 respectively. Next vif5 and
853 * vif6 from ctx3 reserve ctx4. If vif3 and
854 * vif4 remain on ctx2 as they are then this
855 * fails unless `replace_ctx` from ctx5 is
856 * replaced with ctx3.
858 list_for_each_entry(ctx, &local->chanctx_list,
860 if (ctx->replace_state !=
861 IEEE80211_CHANCTX_REPLACE_NONE)
864 if (!list_empty(&ctx->reserved_vifs))
873 * If that's true then all available contexts already
874 * have reservations and cannot be used.
877 (curr_ctx->replace_state ==
878 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
879 !list_empty(&curr_ctx->reserved_vifs))
882 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
886 new_ctx->replace_ctx = curr_ctx;
887 new_ctx->replace_state =
888 IEEE80211_CHANCTX_REPLACES_OTHER;
890 curr_ctx->replace_ctx = new_ctx;
891 curr_ctx->replace_state =
892 IEEE80211_CHANCTX_WILL_BE_REPLACED;
894 list_add_rcu(&new_ctx->list, &local->chanctx_list);
898 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
899 sdata->reserved_chanctx = new_ctx;
900 sdata->reserved_chandef = *chandef;
901 sdata->reserved_radar_required = radar_required;
902 sdata->reserved_ready = false;
908 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
910 switch (sdata->vif.type) {
911 case NL80211_IFTYPE_ADHOC:
912 case NL80211_IFTYPE_AP:
913 case NL80211_IFTYPE_MESH_POINT:
914 case NL80211_IFTYPE_OCB:
915 ieee80211_queue_work(&sdata->local->hw,
916 &sdata->csa_finalize_work);
918 case NL80211_IFTYPE_STATION:
919 ieee80211_queue_work(&sdata->local->hw,
920 &sdata->u.mgd.chswitch_work);
922 case NL80211_IFTYPE_UNSPECIFIED:
923 case NL80211_IFTYPE_AP_VLAN:
924 case NL80211_IFTYPE_WDS:
925 case NL80211_IFTYPE_MONITOR:
926 case NL80211_IFTYPE_P2P_CLIENT:
927 case NL80211_IFTYPE_P2P_GO:
928 case NL80211_IFTYPE_P2P_DEVICE:
929 case NUM_NL80211_IFTYPES:
936 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
937 const struct cfg80211_chan_def *chandef)
939 struct ieee80211_sub_if_data *vlan;
941 sdata->vif.bss_conf.chandef = *chandef;
943 if (sdata->vif.type != NL80211_IFTYPE_AP)
946 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
947 vlan->vif.bss_conf.chandef = *chandef;
951 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
953 struct ieee80211_local *local = sdata->local;
954 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
955 struct ieee80211_chanctx *old_ctx, *new_ctx;
956 const struct cfg80211_chan_def *chandef;
960 lockdep_assert_held(&local->mtx);
961 lockdep_assert_held(&local->chanctx_mtx);
963 new_ctx = sdata->reserved_chanctx;
964 old_ctx = ieee80211_vif_get_chanctx(sdata);
966 if (WARN_ON(!sdata->reserved_ready))
969 if (WARN_ON(!new_ctx))
972 if (WARN_ON(!old_ctx))
975 if (WARN_ON(new_ctx->replace_state ==
976 IEEE80211_CHANCTX_REPLACES_OTHER))
979 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
980 &sdata->reserved_chandef);
981 if (WARN_ON(!chandef))
984 vif_chsw[0].vif = &sdata->vif;
985 vif_chsw[0].old_ctx = &old_ctx->conf;
986 vif_chsw[0].new_ctx = &new_ctx->conf;
988 list_del(&sdata->reserved_chanctx_list);
989 sdata->reserved_chanctx = NULL;
991 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
992 CHANCTX_SWMODE_REASSIGN_VIF);
994 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
995 ieee80211_free_chanctx(local, new_ctx);
1000 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1001 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1003 if (sdata->vif.type == NL80211_IFTYPE_AP)
1004 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1006 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1007 ieee80211_free_chanctx(local, old_ctx);
1009 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1010 changed = BSS_CHANGED_BANDWIDTH;
1012 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1015 ieee80211_bss_info_change_notify(sdata, changed);
1018 ieee80211_vif_chanctx_reservation_complete(sdata);
1023 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1025 struct ieee80211_local *local = sdata->local;
1026 struct ieee80211_chanctx *old_ctx, *new_ctx;
1027 const struct cfg80211_chan_def *chandef;
1030 old_ctx = ieee80211_vif_get_chanctx(sdata);
1031 new_ctx = sdata->reserved_chanctx;
1033 if (WARN_ON(!sdata->reserved_ready))
1036 if (WARN_ON(old_ctx))
1039 if (WARN_ON(!new_ctx))
1042 if (WARN_ON(new_ctx->replace_state ==
1043 IEEE80211_CHANCTX_REPLACES_OTHER))
1046 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1047 &sdata->reserved_chandef);
1048 if (WARN_ON(!chandef))
1051 list_del(&sdata->reserved_chanctx_list);
1052 sdata->reserved_chanctx = NULL;
1054 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1056 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1057 ieee80211_free_chanctx(local, new_ctx);
1063 ieee80211_vif_chanctx_reservation_complete(sdata);
1068 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1070 struct ieee80211_chanctx *old_ctx, *new_ctx;
1072 lockdep_assert_held(&sdata->local->chanctx_mtx);
1074 new_ctx = sdata->reserved_chanctx;
1075 old_ctx = ieee80211_vif_get_chanctx(sdata);
1080 if (WARN_ON(!new_ctx))
1083 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1086 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1092 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1093 struct ieee80211_chanctx *new_ctx)
1095 const struct cfg80211_chan_def *chandef;
1097 lockdep_assert_held(&local->mtx);
1098 lockdep_assert_held(&local->chanctx_mtx);
1100 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1101 if (WARN_ON(!chandef))
1104 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1105 local->_oper_chandef = *chandef;
1106 ieee80211_hw_config(local, 0);
1111 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1114 struct ieee80211_vif_chanctx_switch *vif_chsw;
1115 struct ieee80211_sub_if_data *sdata;
1116 struct ieee80211_chanctx *ctx, *old_ctx;
1119 lockdep_assert_held(&local->mtx);
1120 lockdep_assert_held(&local->chanctx_mtx);
1122 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1127 list_for_each_entry(ctx, &local->chanctx_list, list) {
1128 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1131 if (WARN_ON(!ctx->replace_ctx)) {
1136 list_for_each_entry(sdata, &ctx->reserved_vifs,
1137 reserved_chanctx_list) {
1138 if (!ieee80211_vif_has_in_place_reservation(
1142 old_ctx = ieee80211_vif_get_chanctx(sdata);
1143 vif_chsw[i].vif = &sdata->vif;
1144 vif_chsw[i].old_ctx = &old_ctx->conf;
1145 vif_chsw[i].new_ctx = &ctx->conf;
1151 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1152 CHANCTX_SWMODE_SWAP_CONTEXTS);
1159 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1161 struct ieee80211_chanctx *ctx;
1164 lockdep_assert_held(&local->mtx);
1165 lockdep_assert_held(&local->chanctx_mtx);
1167 list_for_each_entry(ctx, &local->chanctx_list, list) {
1168 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1171 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1174 ieee80211_del_chanctx(local, ctx->replace_ctx);
1175 err = ieee80211_add_chanctx(local, ctx);
1183 WARN_ON(ieee80211_add_chanctx(local, ctx));
1184 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1185 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1188 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1191 ieee80211_del_chanctx(local, ctx);
1192 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1198 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1200 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1201 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1202 struct ieee80211_chanctx *new_ctx = NULL;
1203 int i, err, n_assigned, n_reserved, n_ready;
1204 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1206 lockdep_assert_held(&local->mtx);
1207 lockdep_assert_held(&local->chanctx_mtx);
1210 * If there are 2 independent pairs of channel contexts performing
1211 * cross-switch of their vifs this code will still wait until both are
1212 * ready even though it could be possible to switch one before the
1215 * For practical reasons and code simplicity just do a single huge
1220 * Verify if the reservation is still feasible.
1221 * - if it's not then disconnect
1222 * - if it is but not all vifs necessary are ready then defer
1225 list_for_each_entry(ctx, &local->chanctx_list, list) {
1226 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1229 if (WARN_ON(!ctx->replace_ctx)) {
1234 if (!local->use_chanctx)
1243 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1244 assigned_chanctx_list) {
1246 if (sdata->reserved_chanctx) {
1248 if (sdata->reserved_ready)
1253 if (n_assigned != n_reserved) {
1254 if (n_ready == n_reserved) {
1255 wiphy_info(local->hw.wiphy,
1256 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1264 ctx->conf.radar_enabled = false;
1265 list_for_each_entry(sdata, &ctx->reserved_vifs,
1266 reserved_chanctx_list) {
1267 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1268 !sdata->reserved_ready)
1271 old_ctx = ieee80211_vif_get_chanctx(sdata);
1273 if (old_ctx->replace_state ==
1274 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1282 if (sdata->reserved_radar_required)
1283 ctx->conf.radar_enabled = true;
1287 if (WARN_ON(n_ctx == 0) ||
1288 WARN_ON(n_vifs_switch == 0 &&
1289 n_vifs_assign == 0 &&
1290 n_vifs_ctxless == 0) ||
1291 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1292 WARN_ON(!new_ctx && !local->use_chanctx)) {
1298 * All necessary vifs are ready. Perform the switch now depending on
1299 * reservations and driver capabilities.
1302 if (local->use_chanctx) {
1303 if (n_vifs_switch > 0) {
1304 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1309 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1310 err = ieee80211_chsw_switch_ctxs(local);
1315 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1321 * Update all structures, values and pointers to point to new channel
1326 list_for_each_entry(ctx, &local->chanctx_list, list) {
1327 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1330 if (WARN_ON(!ctx->replace_ctx)) {
1335 list_for_each_entry(sdata, &ctx->reserved_vifs,
1336 reserved_chanctx_list) {
1339 if (!ieee80211_vif_has_in_place_reservation(sdata))
1342 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1344 if (sdata->vif.type == NL80211_IFTYPE_AP)
1345 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1348 sdata->radar_required = sdata->reserved_radar_required;
1350 if (sdata->vif.bss_conf.chandef.width !=
1351 sdata->reserved_chandef.width)
1352 changed = BSS_CHANGED_BANDWIDTH;
1354 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1356 ieee80211_bss_info_change_notify(sdata,
1359 ieee80211_recalc_txpower(sdata);
1362 ieee80211_recalc_chanctx_chantype(local, ctx);
1363 ieee80211_recalc_smps_chanctx(local, ctx);
1364 ieee80211_recalc_radar_chanctx(local, ctx);
1365 ieee80211_recalc_chanctx_min_def(local, ctx);
1367 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1368 reserved_chanctx_list) {
1369 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1372 list_del(&sdata->reserved_chanctx_list);
1373 list_move(&sdata->assigned_chanctx_list,
1374 &ctx->assigned_vifs);
1375 sdata->reserved_chanctx = NULL;
1377 ieee80211_vif_chanctx_reservation_complete(sdata);
1381 * This context might have been a dependency for an already
1382 * ready re-assign reservation interface that was deferred. Do
1383 * not propagate error to the caller though. The in-place
1384 * reservation for originally requested interface has already
1385 * succeeded at this point.
1387 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1388 reserved_chanctx_list) {
1389 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1393 if (WARN_ON(sdata->reserved_chanctx != ctx))
1396 if (!sdata->reserved_ready)
1399 if (ieee80211_vif_get_chanctx(sdata))
1400 err = ieee80211_vif_use_reserved_reassign(
1403 err = ieee80211_vif_use_reserved_assign(sdata);
1407 "failed to finalize (re-)assign reservation (err=%d)\n",
1409 ieee80211_vif_unreserve_chanctx(sdata);
1410 cfg80211_stop_iface(local->hw.wiphy,
1418 * Finally free old contexts
1421 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1422 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1425 ctx->replace_ctx->replace_ctx = NULL;
1426 ctx->replace_ctx->replace_state =
1427 IEEE80211_CHANCTX_REPLACE_NONE;
1429 list_del_rcu(&ctx->list);
1430 kfree_rcu(ctx, rcu_head);
1436 list_for_each_entry(ctx, &local->chanctx_list, list) {
1437 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1440 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1441 reserved_chanctx_list) {
1442 ieee80211_vif_unreserve_chanctx(sdata);
1443 ieee80211_vif_chanctx_reservation_complete(sdata);
1450 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1452 struct ieee80211_local *local = sdata->local;
1453 struct ieee80211_chanctx_conf *conf;
1454 struct ieee80211_chanctx *ctx;
1455 bool use_reserved_switch = false;
1457 lockdep_assert_held(&local->chanctx_mtx);
1459 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1460 lockdep_is_held(&local->chanctx_mtx));
1464 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1466 if (sdata->reserved_chanctx) {
1467 if (sdata->reserved_chanctx->replace_state ==
1468 IEEE80211_CHANCTX_REPLACES_OTHER &&
1469 ieee80211_chanctx_num_reserved(local,
1470 sdata->reserved_chanctx) > 1)
1471 use_reserved_switch = true;
1473 ieee80211_vif_unreserve_chanctx(sdata);
1476 ieee80211_assign_vif_chanctx(sdata, NULL);
1477 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1478 ieee80211_free_chanctx(local, ctx);
1480 /* Unreserving may ready an in-place reservation. */
1481 if (use_reserved_switch)
1482 ieee80211_vif_use_reserved_switch(local);
1485 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1486 const struct cfg80211_chan_def *chandef,
1487 enum ieee80211_chanctx_mode mode)
1489 struct ieee80211_local *local = sdata->local;
1490 struct ieee80211_chanctx *ctx;
1491 u8 radar_detect_width = 0;
1494 lockdep_assert_held(&local->mtx);
1496 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1498 mutex_lock(&local->chanctx_mtx);
1500 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1502 sdata->wdev.iftype);
1506 radar_detect_width = BIT(chandef->width);
1508 sdata->radar_required = ret;
1510 ret = ieee80211_check_combinations(sdata, chandef, mode,
1511 radar_detect_width);
1515 __ieee80211_vif_release_channel(sdata);
1517 ctx = ieee80211_find_chanctx(local, chandef, mode);
1519 ctx = ieee80211_new_chanctx(local, chandef, mode);
1525 ieee80211_vif_update_chandef(sdata, chandef);
1527 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1529 /* if assign fails refcount stays the same */
1530 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1531 ieee80211_free_chanctx(local, ctx);
1535 ieee80211_recalc_smps_chanctx(local, ctx);
1536 ieee80211_recalc_radar_chanctx(local, ctx);
1538 mutex_unlock(&local->chanctx_mtx);
1542 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1544 struct ieee80211_local *local = sdata->local;
1545 struct ieee80211_chanctx *new_ctx;
1546 struct ieee80211_chanctx *old_ctx;
1549 lockdep_assert_held(&local->mtx);
1550 lockdep_assert_held(&local->chanctx_mtx);
1552 new_ctx = sdata->reserved_chanctx;
1553 old_ctx = ieee80211_vif_get_chanctx(sdata);
1555 if (WARN_ON(!new_ctx))
1558 if (WARN_ON(new_ctx->replace_state ==
1559 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1562 if (WARN_ON(sdata->reserved_ready))
1565 sdata->reserved_ready = true;
1567 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1569 err = ieee80211_vif_use_reserved_reassign(sdata);
1571 err = ieee80211_vif_use_reserved_assign(sdata);
1578 * In-place reservation may need to be finalized now either if:
1579 * a) sdata is taking part in the swapping itself and is the last one
1580 * b) sdata has switched with a re-assign reservation to an existing
1581 * context readying in-place switching of old_ctx
1583 * In case of (b) do not propagate the error up because the requested
1584 * sdata already switched successfully. Just spill an extra warning.
1585 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1586 * interfaces upon failure.
1589 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1590 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1591 err = ieee80211_vif_use_reserved_switch(local);
1592 if (err && err != -EAGAIN) {
1593 if (new_ctx->replace_state ==
1594 IEEE80211_CHANCTX_REPLACES_OTHER)
1597 wiphy_info(local->hw.wiphy,
1598 "depending in-place reservation failed (err=%d)\n",
1606 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1607 const struct cfg80211_chan_def *chandef,
1610 struct ieee80211_local *local = sdata->local;
1611 struct ieee80211_chanctx_conf *conf;
1612 struct ieee80211_chanctx *ctx;
1613 const struct cfg80211_chan_def *compat;
1616 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1617 IEEE80211_CHAN_DISABLED))
1620 mutex_lock(&local->chanctx_mtx);
1621 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1626 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1627 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1632 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1633 lockdep_is_held(&local->chanctx_mtx));
1639 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1641 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1647 switch (ctx->replace_state) {
1648 case IEEE80211_CHANCTX_REPLACE_NONE:
1649 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1654 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1655 /* TODO: Perhaps the bandwidth change could be treated as a
1656 * reservation itself? */
1659 case IEEE80211_CHANCTX_REPLACES_OTHER:
1660 /* channel context that is going to replace another channel
1661 * context doesn't really exist and shouldn't be assigned
1667 ieee80211_vif_update_chandef(sdata, chandef);
1669 ieee80211_recalc_chanctx_chantype(local, ctx);
1671 *changed |= BSS_CHANGED_BANDWIDTH;
1674 mutex_unlock(&local->chanctx_mtx);
1678 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1680 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1682 lockdep_assert_held(&sdata->local->mtx);
1684 mutex_lock(&sdata->local->chanctx_mtx);
1685 __ieee80211_vif_release_channel(sdata);
1686 mutex_unlock(&sdata->local->chanctx_mtx);
1689 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1691 struct ieee80211_local *local = sdata->local;
1692 struct ieee80211_sub_if_data *ap;
1693 struct ieee80211_chanctx_conf *conf;
1695 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1698 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1700 mutex_lock(&local->chanctx_mtx);
1702 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1703 lockdep_is_held(&local->chanctx_mtx));
1704 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1705 mutex_unlock(&local->chanctx_mtx);
1708 void ieee80211_iter_chan_contexts_atomic(
1709 struct ieee80211_hw *hw,
1710 void (*iter)(struct ieee80211_hw *hw,
1711 struct ieee80211_chanctx_conf *chanctx_conf,
1715 struct ieee80211_local *local = hw_to_local(hw);
1716 struct ieee80211_chanctx *ctx;
1719 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1720 if (ctx->driver_present)
1721 iter(hw, &ctx->conf, iter_data);
1724 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);