This is a note to let you know that I've just added the patch titled mac80211: sta_info: Add lockdep condition for RCU list usage to the 5.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mac80211-sta_info-add-lockdep-condition-for-rcu-list.patch and it can be found in the queue-5.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 3822e767d4ee299e28739329cb5b2b7ba562f43f Author: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> Date: Thu Apr 9 13:59:06 2020 +0530 mac80211: sta_info: Add lockdep condition for RCU list usage [ Upstream commit 8ca47eb9f9e4e10e7e7fa695731a88941732c38d ] The function sta_info_get_by_idx() uses RCU list primitive. It is called with local->sta_mtx held from mac80211/cfg.c. Add lockdep expression to avoid any false positive RCU list warnings. Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> Link: https://lore.kernel.org/r/20200409082906.27427-1-madhuparnabhowmik10@xxxxxxxxx Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index e3572be307d6c..149ed0510778d 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -231,7 +231,8 @@ struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, struct sta_info *sta; int i = 0; - list_for_each_entry_rcu(sta, &local->sta_list, list) { + list_for_each_entry_rcu(sta, &local->sta_list, list, + lockdep_is_held(&local->sta_mtx)) { if (sdata != sta->sdata) continue; if (i < idx) {