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@gmail.com>
Link: https://lore.kernel.org/r/20200409082906.27427-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 21b1422..b1669f0 100644 (file)
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -217,7 +217,8 @@ 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) {