netdev - Re: [PATCH] davinci_mdio: Fix MDIO timeout check

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Date:	Tue, 17 Apr 2012 22:32:59 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	christian.riesch@...cron.at
Cc:	netdev@...r.kernel.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	ravonereal@...il.com, manfred.rudigier@...cron.at,
	stable@...r.kernel.org, cyril@...com
Subject: Re: [PATCH] davinci_mdio: Fix MDIO timeout check

From: Christian Riesch <christian.riesch@...cron.at>
Date: Mon, 16 Apr 2012 16:35:25 +0200

> Under heavy load (flood ping) it is possible for the MDIO timeout to
> expire before the loop checks the GO bit again. This patch adds an
> additional check whether the operation was done before actually
> returning -ETIMEDOUT.
> 
> To reproduce this bug, flood ping the device, e.g., ping -f -l 1000
> After some time, a "timed out waiting for user access" warning
> may appear. And even worse, link may go down since the PHY reported a
> timeout.
> 
> Signed-off-by: Christian Riesch <christian.riesch@...cron.at>
> Cc: <stable@...r.kernel.org>
> Cc: Cyril Chemparathy <cyril@...com>

Applied.
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