From 025e6be220e448c02045e8499c7db8ce4bc8eea2 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 5 Oct 2010 10:41:47 +0200 Subject: mac80211: fix deadlock with multiple interfaces The locking around ieee80211_recalc_smps is buggy -- it cannot acquire another interface's mutex while the iflist mutex is held because another code path could be holding the iface mutex and trying to acquire the iflist mutex. But the locking is also unnecessary, we only check "ifmgd->associated" as a bool, and don't use the pointer (in check_mgd_smps). Reported-by: Ben Greear Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/mac80211/main.c') diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 9c2f3f934c74..e3717092115f 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -333,7 +333,7 @@ static void ieee80211_recalc_smps_work(struct work_struct *work) container_of(work, struct ieee80211_local, recalc_smps); mutex_lock(&local->iflist_mtx); - ieee80211_recalc_smps(local, NULL); + ieee80211_recalc_smps(local); mutex_unlock(&local->iflist_mtx); } -- cgit v1.2.1