netdev - Re: atl1: WARNING at net/sched/sch

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Message-ID: <20080914191135.2a28e6a6@osprey.hogchain.net>
Date:	Sun, 14 Sep 2008 19:11:35 -0500
From:	Jay Cliburn <jacliburn@...lsouth.net>
To:	David Miller <davem@...emloft.net>
Cc:	adobriyan@...il.com, csnook@...hat.com, netdev@...r.kernel.org
Subject: Re: atl1: WARNING at net/sched/sch_generic.c:221

On Sun, 14 Sep 2008 16:56:55 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Jay Cliburn <jacliburn@...lsouth.net>
> Date: Sun, 14 Sep 2008 14:26:54 -0500
> 
> > Should a netdev driver be coded such that a watchdog transmit
> > timeout never occurs?
> > 
> > [ 2086.049998] NETDEV WATCHDOG: eth0 (atl1): transmit timed out
> > 
> > Or is a watchdog timeout an expected occurrence if a cable is
> > unplugged/plugged?
> 
> If the cable is unplugged, netif_carrier_off() will be (or should
> be) invoked by the driver, and that cancels the watchdog timer.

Thanks, I think I found the problem.  It seems to fix it for me, but
I'd like Alexey to test the patch before I submit it to mainline.  He
seems to be able to hit the issue more frequently than I can.

> 
> This is all from memory since I'm travelling and don't have the
> time to check this directly.  You should investigate this yourself
> instead of asking me if you want a truly definitive answer :)

I've been investigating it myself in my spare time since Alexey pointed
out the problem August 21.

Happy travels.
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