linux-kernel - [ 147/167] [PATCH] wl1251: fix crash on remove due to leftover work item

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Message-Id: <20120509055049.873944883@decadent.org.uk>
Date:	Wed, 09 May 2012 06:52:56 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Grazvydas Ignotas <notasas@...il.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 147/167] [PATCH] wl1251: fix crash on remove due to leftover work item

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Grazvydas Ignotas <notasas@...il.com>

commit 4c1bcdb5a3354b250b82a67549f57ac27a3bb85f upstream.

This driver currently leaves elp_work behind when stopping, which
occasionally results in data corruption because work function ends
up accessing freed memory, typical symptoms of this are various
worker_thread crashes. Fix it by cancelling elp_work.

Signed-off-by: Grazvydas Ignotas <notasas@...il.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/wl1251/main.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/wl1251/main.c b/drivers/net/wireless/wl1251/main.c
index 41302c7..d1afb8e 100644
--- a/drivers/net/wireless/wl1251/main.c
+++ b/drivers/net/wireless/wl1251/main.c
@@ -479,6 +479,7 @@ static void wl1251_op_stop(struct ieee80211_hw *hw)
 	cancel_work_sync(&wl->irq_work);
 	cancel_work_sync(&wl->tx_work);
 	cancel_work_sync(&wl->filter_work);
+	cancel_delayed_work_sync(&wl->elp_work);
 
 	mutex_lock(&wl->mutex);
 
-- 
1.7.10



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