netdev - Re: Gianfar driver failing on MPC8641D based board

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Message-ID: <4B87E9EF.3010604@ge.com>
Date:	Fri, 26 Feb 2010 15:34:07 +0000
From:	Martyn Welch <martyn.welch@...com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	Sandeep Gopalpet <Sandeep.Kumar@...escale.com>,
	avorontsov@...mvista.com, davem@...emloft.net
Subject: Re: Gianfar driver failing on MPC8641D based board

Martyn Welch wrote:
> 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.
>   

Out of 10 boot attempts, 7 failed.

Martyn

-- 
Martyn Welch (Principal Software Engineer)   |   Registered in England and
GE Intelligent Platforms                     |   Wales (3828642) at 100
T +44(0)127322748                            |   Barbirolli Square, Manchester,
E martyn.welch@...com                        |   M2 3AB  VAT:GB 927559189

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