From c189a685b83955a39884dc2bdae531bc0adf3b98 Mon Sep 17 00:00:00 2001 From: Andrei Otcheretianski Date: Sun, 25 Oct 2015 10:59:40 +0200 Subject: [PATCH] mac80211: Remove WARN_ON_ONCE in ieee80211_recalc_smps The recalc_smps work can run after the station disassociates. At this stage we already released the channel, but the work will be cancelled only when the interface stops. In this scenario we can hit the warning in ieee80211_recalc_smps, so just remove it. Signed-off-by: Andrei Otcheretianski Signed-off-by: Emmanuel Grumbach Signed-off-by: Johannes Berg --- net/mac80211/util.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 7f7ddc527baa..b0e3a4248bd5 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -2151,7 +2151,13 @@ void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata) chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf, lockdep_is_held(&local->chanctx_mtx)); - if (WARN_ON_ONCE(!chanctx_conf)) + /* + * This function can be called from a work, thus it may be possible + * that the chanctx_conf is removed (due to a disconnection, for + * example). + * So nothing should be done in such case. + */ + if (!chanctx_conf) goto unlock; chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf); -- 2.20.1