netdev - Re: [PATCH v5 1/1 net] net: fec: fix kernel oops when plug/unplug cable many times

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Message-Id: <20130508.131535.1684695560935318559.davem@davemloft.net>
Date:	Wed, 08 May 2013 13:15:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Frank.Li@...escale.com
Cc:	romieu@...zoreil.com, r.schwebel@...gutronix.de,
	l.stach@...gutronix.de, netdev@...r.kernel.org, festevam@...il.com,
	shawn.guo@...aro.org, lznuaa@...il.com
Subject: Re: [PATCH v5 1/1 net] net: fec: fix kernel oops when plug/unplug
 cable many times

From: Frank Li <Frank.Li@...escale.com>
Date: Wed, 8 May 2013 08:08:44 +0800

> reproduce steps
>  1. flood ping from other machine
>  	ping -f -s 41000 IP
>  2. run below script
>     while [ 1 ]; do ethtool -s eth0 autoneg off;
>     sleep 3;ethtool -s eth0 autoneg on; sleep 4; done;
> 
> You can see oops in one hour.
> 
> The reason is fec_restart clear BD but NAPI may use it.
> The solution is disable NAPI and stop xmit when reset BD.
> disable NAPI may sleep, so fec_restart can't be call in
> atomic context.
> 
> Signed-off-by: Frank Li <Frank.Li@...escale.com>
> Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> Tested-by: Lucas Stach <l.stach@...gutronix.de>

Applied and queued up for -stable.
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