netdev - Re: [PATCH v3 1/1 net] net: fec: fix kernel oops when plug/unplug cable many times

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Date:	Mon, 6 May 2013 15:47:53 +0800
From:	Frank Li <lznuaa@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	"Frank.Li@...escale.com" <Frank.Li@...escale.com>,
	Francois Romieu <romieu@...zoreil.com>,
	Robert Schwebel <r.schwebel@...gutronix.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Fabio Estevam <festevam@...il.com>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH v3 1/1 net] net: fec: fix kernel oops when plug/unplug
 cable many times

2013/5/3 David Miller <davem@...emloft.net>:
> From: Frank Li <Frank.Li@...escale.com>
> Date: Thu, 2 May 2013 08:55:38 +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>
>
> Please respin this against the current 'net' tree.

MX6 can't bootup at net and net-next tree.
I am identifying the reason.

>
> Thanks!
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