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

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commit ab48b03ec9 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@systec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Stein
2012-11-27 08:52:34 +01:00
committed by Greg Kroah-Hartman
parent c39096f1ae
commit a0ed2e748a
1 changed files with 1 additions and 2 deletions
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3
drivers/net/can/dev.c
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@@ -557,8 +557,7 @@ 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);