[27/40] wifi: cfg80211: hold wiphy lock in cfg80211_any_wiphy_oper_chan()

Commit Message

Johannes Berg Aug. 28, 2023, 11:59 a.m. UTC

From: Johannes Berg <[e-mail]>

We have the RTNL here for the iteration, but we need to lock
each wiphy separately as well for using its data. Hold the
wiphy lock for all of the ones in the iteration. Note that
this implies we cannot already hold the wiphy mutex for the
wiphy passed by the argument, but that's true now.

Signed-off-by: Johannes Berg <[e-mail]>
---
 net/wireless/chan.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Patch

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 3c691ae904d1..b2469e2c1e70 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -824,13 +824,17 @@  bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
 		return false;
 
 	for_each_rdev(rdev) {
+		bool found;
+
 		if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
 			continue;
 
-		if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
-			return true;
+		wiphy_lock(&rdev->wiphy);
+		found = cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan) ||
+			cfg80211_offchan_chain_is_active(rdev, chan);
+		wiphy_unlock(&rdev->wiphy);
 
-		if (cfg80211_offchan_chain_is_active(rdev, chan))
+		if (found)
 			return true;
 	}