From 05523f74ed90b7b7d66a6a4a199318fa34a4b0f2 Mon Sep 17 00:00:00 2001 From: Michael Buesch Date: Tue, 7 Aug 2007 12:20:40 +0200 Subject: [PATCH] softmac: Fix deadlock of wx_set_essid with assoc work The essid wireless extension does deadlock against the assoc mutex, as we don't unlock the assoc mutex when flushing the workqueue, which also holds the lock. Signed-off-by: Michael Buesch Signed-off-by: Greg Kroah-Hartman --- net/ieee80211/softmac/ieee80211softmac_wx.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/net/ieee80211/softmac/ieee80211softmac_wx.c b/net/ieee80211/softmac/ieee80211softmac_wx.c index f13937bf9e8c..d054e9224b3e 100644 --- a/net/ieee80211/softmac/ieee80211softmac_wx.c +++ b/net/ieee80211/softmac/ieee80211softmac_wx.c @@ -74,8 +74,8 @@ ieee80211softmac_wx_set_essid(struct net_device *net_dev, struct ieee80211softmac_auth_queue_item *authptr; int length = 0; +check_assoc_again: mutex_lock(&sm->associnfo.mutex); - /* Check if we're already associating to this or another network * If it's another network, cancel and start over with our new network * If it's our network, ignore the change, we're already doing it! @@ -98,13 +98,18 @@ ieee80211softmac_wx_set_essid(struct net_device *net_dev, cancel_delayed_work(&authptr->work); sm->associnfo.bssvalid = 0; sm->associnfo.bssfixed = 0; - flush_scheduled_work(); sm->associnfo.associating = 0; sm->associnfo.associated = 0; + /* We must unlock to avoid deadlocks with the assoc workqueue + * on the associnfo.mutex */ + mutex_unlock(&sm->associnfo.mutex); + flush_scheduled_work(); + /* Avoid race! Check assoc status again. Maybe someone started an + * association while we flushed. */ + goto check_assoc_again; } } - sm->associnfo.static_essid = 0; sm->associnfo.assoc_wait = 0; -- 2.39.5