Commit e4746851 authored by Simon Wunderlich's avatar Simon Wunderlich Committed by Johannes Berg
Browse files

mac80211: fix recalc_radar hwconf sync problem 



local->hw.conf maybe not be synced when recalcing whether radar is
enabled, sometimes leaving radar enabled even if it's not neccesary
anymore.

Fix this by:
 * setting radar_enabled when creating the chanctx
 * turning radar_enabled off before destroying the last channel context

Reported-by: default avatarZefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: default avatarSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 3088f7d2

net/mac80211/chan.c

+33 −10
Original line number Diff line number Diff line
@@ -57,6 +57,22 @@ ieee80211_find_chanctx(struct ieee80211_local *local, 
	return NULL;

}



static bool ieee80211_is_radar_required(struct ieee80211_local *local)

{

	struct ieee80211_sub_if_data *sdata;



	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {

		if (sdata->radar_required) {

			rcu_read_unlock();

			return true;

		}

	}

	rcu_read_unlock();



	return false;

}



static struct ieee80211_chanctx *

ieee80211_new_chanctx(struct ieee80211_local *local,

		      const struct cfg80211_chan_def *chandef,
@@ -75,6 +91,9 @@ ieee80211_new_chanctx(struct ieee80211_local *local, 
	ctx->conf.rx_chains_static = 1;

	ctx->conf.rx_chains_dynamic = 1;

	ctx->mode = mode;

	ctx->conf.radar_enabled = ieee80211_is_radar_required(local);

	if (!local->use_chanctx)

		local->hw.conf.radar_enabled = ctx->conf.radar_enabled;



	if (!local->use_chanctx) {

		local->_oper_chandef = *chandef;
@@ -99,6 +118,7 @@ ieee80211_new_chanctx(struct ieee80211_local *local, 
static void ieee80211_free_chanctx(struct ieee80211_local *local,

				   struct ieee80211_chanctx *ctx)

{

	bool check_single_channel = false;

	lockdep_assert_held(&local->chanctx_mtx);



	WARN_ON_ONCE(ctx->refcount != 0);
@@ -108,6 +128,14 @@ static void ieee80211_free_chanctx(struct ieee80211_local *local, 
		chandef->width = NL80211_CHAN_WIDTH_20_NOHT;

		chandef->center_freq1 = chandef->chan->center_freq;

		chandef->center_freq2 = 0;



		/* NOTE: Disabling radar is only valid here for

		 * single channel context. To be sure, check it ...

		 */

		if (local->hw.conf.radar_enabled)

			check_single_channel = true;

		local->hw.conf.radar_enabled = false;



		ieee80211_hw_config(local, 0);

	} else {

		drv_remove_chanctx(local, ctx);
@@ -116,6 +144,9 @@ static void ieee80211_free_chanctx(struct ieee80211_local *local, 
	list_del_rcu(&ctx->list);

	kfree_rcu(ctx, rcu_head);



	/* throw a warning if this wasn't the only channel context. */

	WARN_ON(check_single_channel && !list_empty(&local->chanctx_list));



	mutex_lock(&local->mtx);

	ieee80211_recalc_idle(local);

	mutex_unlock(&local->mtx);
@@ -227,19 +258,11 @@ static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 
void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,

				    struct ieee80211_chanctx *chanctx)

{

	struct ieee80211_sub_if_data *sdata;

	bool radar_enabled = false;

	bool radar_enabled;



	lockdep_assert_held(&local->chanctx_mtx);



	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {

		if (sdata->radar_required) {

			radar_enabled = true;

			break;

		}

	}

	rcu_read_unlock();

	radar_enabled = ieee80211_is_radar_required(local);



	if (radar_enabled == chanctx->conf.radar_enabled)

		return;

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