netdev - Re: [PATCH v3 3/3] ucc_geth: Fix hangs after switching from full to half duplex

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Message-Id: <20090911.121958.06510883.davem@davemloft.net>
Date:	Fri, 11 Sep 2009 12:19:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	avorontsov@...mvista.com
Cc:	scottwood@...escale.com, netdev@...r.kernel.org,
	afleming@...escale.com, timur@...escale.com,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH v3 3/3] ucc_geth: Fix hangs after switching from full
 to half duplex

From: Anton Vorontsov <avorontsov@...mvista.com>
Date: Fri, 11 Sep 2009 01:48:12 +0400

> MPC8360 QE UCC ethernet controllers hang when changing link duplex
> under a load (a bit of NFS activity is enough).
> 
>   PHY: mdio@...02120:00 - Link is Up - 1000/Full
>   sh-3.00# ethtool -s eth0 speed 100 duplex half autoneg off
>   PHY: mdio@...02120:00 - Link is Down
>   PHY: mdio@...02120:00 - Link is Up - 100/Half
>   NETDEV WATCHDOG: eth0 (ucc_geth): transmit queue 0 timed out
>   ------------[ cut here ]------------
>   Badness at c01fcbd0 [verbose debug info unavailable]
>   NIP: c01fcbd0 LR: c01fcbd0 CTR: c0194e44
>   ...
> 
> The cure is to disable the controller before changing speed/duplex
> and enable it afterwards.
> 
> Though, disabling the controller might take quite a while, so we
> better not grab any spinlocks in adjust_link(). Instead, we quiesce
> the driver's activity, and only then disable the controller.
> 
> Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>

Applied.
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