Patchwork [06/74] mac80211: use del_timer_sync for final sta cleanup timer deletion

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Submitter Herton Ronaldo Krzesinski
Date Jan. 24, 2013, 3:26 a.m.
Message ID <1358998046-613-7-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/215119/
State New
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Comments

Herton Ronaldo Krzesinski - Jan. 24, 2013, 3:26 a.m.
3.5.7.4 -stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit a56f992cdabc63f56b4b142885deebebf936ff76 upstream.

This is a very old bug, but there's nothing that prevents the
timer from running while the module is being removed when we
only do del_timer() instead of del_timer_sync().

The timer should normally not be running at this point, but
it's not clearly impossible (or we could just remove this.)

Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 net/mac80211/sta_info.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 6c74f1e..fec8eab 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -844,7 +844,7 @@  void sta_info_init(struct ieee80211_local *local)
 
 void sta_info_stop(struct ieee80211_local *local)
 {
-	del_timer(&local->sta_cleanup);
+	del_timer_sync(&local->sta_cleanup);
 	sta_info_flush(local, NULL);
 }