From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Date: Thu, 9 Apr 2020 08:29:06 +0000 (+0530)
Subject: mac80211: sta_info: Add lockdep condition for RCU list usage
X-Git-Tag: v5.15~3983^2~4^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8ca47eb9f9e4e10e7e7fa695731a88941732c38d;p=platform%2Fkernel%2Flinux-starfive.git

mac80211: sta_info: Add lockdep condition for RCU list usage

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>
---

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index f8d5c25..cd8487b 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) {