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[6/9] wifi: mac80211: avoid lockdep checking when removing deflink

Message ID 20230619161906.cdd81377dea0.If5a6734b4b85608a2275a09b4f99b5564d82997f@changeid (mailing list archive)
State Accepted
Delegated to: Johannes Berg
Headers show
Series cfg80211/mac80211 patches from our internal tree 2023-06-19 | expand

Commit Message

Greenman, Gregory June 19, 2023, 1:26 p.m. UTC 
From: Benjamin Berg <benjamin.berg@intel.com>

struct sta_info may be removed without holding sta_mtx if it has not
yet been inserted. To support this, only assert that the lock is held
for links other than the deflink.

This fixes lockdep issues that may be triggered in error cases.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 net/mac80211/sta_info.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 731b832b257c..7751f8ba960e 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -355,8 +355,9 @@  static void sta_remove_link(struct sta_info *sta, unsigned int link_id,
 	struct sta_link_alloc *alloc = NULL;
 	struct link_sta_info *link_sta;
 
-	link_sta = rcu_dereference_protected(sta->link[link_id],
-					     lockdep_is_held(&sta->local->sta_mtx));
+	link_sta = rcu_access_pointer(sta->link[link_id]);
+	if (link_sta != &sta->deflink)
+		lockdep_assert_held(&sta->local->sta_mtx);
 
 	if (WARN_ON(!link_sta))
 		return;