linux-kernel - Re: [PATCH] skge: fix occasional BUG during MTU change

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Message-ID: <20090408160621.06f4e556@s6510>
Date:	Wed, 8 Apr 2009 16:06:21 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	mschmidt@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] skge: fix occasional BUG during MTU change

On Wed, 08 Apr 2009 16:01:52 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Michal Schmidt <mschmidt@...hat.com>
> Date: Tue, 7 Apr 2009 18:36:23 +0200
> 
> > The BUG_ON(skge->tx_ring.to_use != skge->tx_ring.to_clean) in skge_up()
> > was sometimes observed when setting MTU.
> > 
> > skge_down() disables the TX queue, but then reenables it by mistake via
> > skge_tx_clean().
> > Fix it by moving the waking of the queue from skge_tx_clean() to the
> > other caller. And to make sure start_xmit is not in progress on another
> > CPU, skge_down() should call netif_tx_disable().
> > 
> > The bug was reported to me by Jiri Jilek whose Debian system sometimes
> > failed to boot. He tested the patch and the bug did not happen anymore.
> > 
> > Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
> 
> Stephen, an ACK possibly?

I wanted to test on real hardware, and am offsite this week.
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