linux-kernel - [032/129] mac80211: delete work timer

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Date:	Sat, 18 Sep 2010 12:12:10 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Johannes Berg <johannes.berg@...el.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [032/129] mac80211: delete work timer

2.6.35-stable review patch.  If anyone has any objections, please let us know.

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

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

commit 071249b1d501b1f31a6b1af3fbcbe03158a84e5c upstream.

The new workqueue changes helped me find this bug
that's been lingering since the changes to the work
processing in mac80211 -- the work timer is never
deleted properly. Do that to avoid having it fire
after all data structures have been freed. It can't
be re-armed because all it will do, if running, is
schedule the work, but that gets flushed later and
won't have anything to do since all work items are
gone by now (by way of interface removal).

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/mac80211/main.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -659,6 +659,12 @@ void ieee80211_unregister_hw(struct ieee

 	rtnl_unlock();

+	/*
+	 * Now all work items will be gone, but the
+	 * timer might still be armed, so delete it
+	 */
+	del_timer_sync(&local->work_timer);
+
 	cancel_work_sync(&local->reconfig_filter);

 	ieee80211_clear_tx_pending(local);

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