[ 3.5.y.z extended stable ] Patch "can: Do not call dev_put if restart timer is running upon" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    can: Do not call dev_put if restart timer is running upon

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From bcbb08e5e29ece459778ec65c7d9f30e53f9064f Mon Sep 17 00:00:00 2001
From: Alexander Stein <alexander.stein at systec-electronic.com>
Date: Tue, 27 Nov 2012 08:52:34 +0100
Subject: [PATCH] can: Do not call dev_put if restart timer is running upon
 close

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 at systec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 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 f03d7a4..4972609 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -576,8 +576,7 @@ 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);
--
1.7.9.5