netdev - Re: Gianfar driver failing on MPC8641D based board

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Message-ID: <4B87E662.3080106@ge.com>
Date:	Fri, 26 Feb 2010 15:18:58 +0000
From:	Martyn Welch <martyn.welch@...com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	avorontsov@...mvista.com,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sandeep Gopalpet <Sandeep.Kumar@...escale.com>,
	davem@...emloft.net
Subject: Re: Gianfar driver failing on MPC8641D based board

Paul Gortmaker wrote:
> On 10-02-26 09:35 AM, Anton Vorontsov wrote:
>   
>> On Fri, Feb 26, 2010 at 12:06:15PM +0000, Martyn Welch wrote:
>>     
>>> Anton Vorontsov wrote:
>>>       
>>>> On Thu, Feb 25, 2010 at 07:53:30PM -0500, Paul Gortmaker wrote:
>>>> [...]
>>>>
>>>>         
>>>>> I was able to reproduce it on an 8641D and bisected it down to this:
>>>>>
>>>>> -----------
>>>>> commit a3bc1f11e9b867a4f49505ecac486a33af248b2e
>>>>> Author: Anton Vorontsov<avorontsov@...mvista.com>
>>>>> Date:   Tue Nov 10 14:11:10 2009 +0000
>>>>>
>>>>>      gianfar: Revive SKB recycling
>>>>>
>>>>>           
>>>> Thanks for the bisect. I have a guess why tx hangs in
>>>> SMP case. Could anyone try the patch down below?
>>>>
>>>>         
>>> Yup, no problem. I'm afraid it doesn't resolve the problem for me.
>>>       
>> Hm.. I found a p2020 board and I was able to reproduce the issue.
>> The patch down below fixed it completely for me... hm.
>>     
>
> Interesting. I just tested the patch on the sbc8641d, and it
> still has the issue with your patch applied.  I'm using NFSroot
> just like Martyn was and it still appears bound up on that
> gianfar tx lock.  I'll see if I can get a SysRq backtrace in
> case that will help you see how it manages to get there...
>   

I've got a p2020ds here as well, so I'll give NFSroot on that a try with
your patch.

Martyn



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