linux-kernel - [ 05/32] net: mv643xx_eth: fix orphaned statistics timer crash

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Message-Id: <20131101214315.037973569@linuxfoundation.org>
Date:	Fri,  1 Nov 2013 14:43:16 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jason Cooper <jason@...edaemon.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 05/32] net: mv643xx_eth: fix orphaned statistics timer crash

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

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

From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>

[ Upstream commit f564412c935111c583b787bcc18157377b208e2e ]

The periodic statistics timer gets started at port _probe() time, but
is stopped on _stop() only. In a modular environment, this can cause
the timer to access already deallocated memory, if the module is unloaded
without starting the eth device. To fix this, we add the timer right
before the port is started, instead of at _probe() time.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Acked-by: Jason Cooper <jason@...edaemon.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/marvell/mv643xx_eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2368,6 +2368,7 @@ static int mv643xx_eth_open(struct net_d
 		mp->int_mask |= INT_TX_END_0 << i;
 	}
 
+	add_timer(&mp->mib_counters_timer);
 	port_start(mp);
 
 	wrlp(mp, INT_MASK_EXT, INT_EXT_LINK_PHY | INT_EXT_TX);
@@ -2909,7 +2910,6 @@ static int mv643xx_eth_probe(struct plat
 	mp->mib_counters_timer.data = (unsigned long)mp;
 	mp->mib_counters_timer.function = mib_counters_timer_wrapper;
 	mp->mib_counters_timer.expires = jiffies + 30 * HZ;
-	add_timer(&mp->mib_counters_timer);
 
 	spin_lock_init(&mp->mib_counters_lock);
 


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