[PATCH 5.13 062/127] mac80211: fix locking in ieee80211_restart_work()

Sasha Levin
2021-08-24T17:00:05Z

From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit 276e189f8e4e3cce1634d6bac4ed0d9ca242441b ]

Ilan's change to move locking around accidentally lost the
wiphy_lock() during some porting, add it back.

Fixes: 45daaa131841 ("mac80211: Properly WARN on HW scan before restart")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20210817121210.47bdb177064f.Ib1ef79440cd27f318c028ddfc0c642406917f512@changeid
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/mac80211/main.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 2481bfdfafd0..efe5c3295455 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -260,6 +260,8 @@ static void ieee80211_restart_work(struct work_struct *work)
flush_work(&local->radar_detected_work);

rtnl_lock();
+ /* we might do interface manipulations, so need both */
+ wiphy_lock(local->hw.wiphy);

WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
"%s called with hardware scan in progress\n", __func__);
--
2.30.2