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net: Add a WARN_ON_ONCE() to the transmit timeout function

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WARN_ON_ONCE() gives a stack trace including the full module list.
Having this in the kernel dump for the timeout case in the
generic netdev watchdog will help us see quicker which driver
is involved. It also allows us to collect statistics 
and patterns in terms of which drivers have this event occuring.

Suggested by Andrew Morton

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arjan van de Ven 2008-05-02 16:21:07 -07:00 committed by David S. Miller
parent 50aab54f30
commit b4192bbd85
1 changed files with 1 additions and 0 deletions
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net/sched/sch_generic.c
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@ -219,6 +219,7 @@ static void dev_watchdog(unsigned long arg)
printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n",
dev->name);
dev->tx_timeout(dev);
WARN_ON_ONCE(1);
}
if (!mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + dev->watchdog_timeo)))
dev_hold(dev);