linux-kernel - [ 086/173] can: Do not call dev_put if restart timer is running upon close

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Message-Id: <20121228190348.197447310@decadent.org.uk>
Date:	Fri, 28 Dec 2012 20:04:56 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Alexander Stein <alexander.stein@...tec-electronic.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [ 086/173] can: Do not call dev_put if restart timer is running upon close

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

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

From: Alexander Stein <alexander.stein@...tec-electronic.com>

commit ab48b03ec9ae1840a1e427e2375bd0d9d554b4ed upstream.

If the restart timer is running due to BUS-OFF and the device is
disconnected an dev_put will decrease the usage counter to -1 thus
blocking the interface removal, resulting in the following dmesg
lines repeating every 10s:
can: notifier: receive list not found for dev can0
can: notifier: receive list not found for dev can0
can: notifier: receive list not found for dev can0
unregister_netdevice: waiting for can0 to become free. Usage count = -1

Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/can/dev.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 963e2cc..8233e5e 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -609,8 +609,7 @@ void close_candev(struct net_device *dev)
 {
 	struct can_priv *priv = netdev_priv(dev);
 
-	if (del_timer_sync(&priv->restart_timer))
-		dev_put(dev);
+	del_timer_sync(&priv->restart_timer);
 	can_flush_echo_skb(dev);
 }
 EXPORT_SYMBOL_GPL(close_candev);


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