linux-kernel - Re: [PATCH 2.6.28 1/1] cxgb3

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Message-ID: <48ED5350.6010502@chelsio.com>
Date:	Wed, 08 Oct 2008 17:41:52 -0700
From:	Divy Le Ray <divy@...lsio.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	jeff@...zik.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Steve Wise <swise@...ngridcomputing.com>
Subject: Re: [PATCH 2.6.28 1/1] cxgb3 - fix race in EEH

Andrew Morton wrote:
> On Thu, 25 Sep 2008 17:05:28 -0700
> Divy Le Ray <divy@...lsio.com> wrote:
>
>   
>> A SGE queue set timer might access registers while in EEH recovery,
>> triggering an EEH error loop. Stop all timers early in EEH process.
>>     
>
> <looks>
>
> It's deeply weird that t3_reset_qset() does
>
> 	memset(&q->tx_reclaim_timer, 0, sizeof(q->tx_reclaim_timer));
>
> There are lots of things in the timer_list which the driver has no
> business modifying.  For example, this might break the metadata in
> Thomas's debugobjects stuff, which attempts to catch things being done
> in the wrong order (I don't think it will, but still...).
>
> Rerunning init_timer() should repair the damage, but I suspect a simple
>
> 	q->tx_reclaim_timer.function = NULL;	/* explanation goes here */
>
> would suffice here.
>
>
> t3_sge_alloc_qset() could use the newer setup_timer().
>
>   
Hi Andrew,

Your suggestion is implemented in the first patch of the series I just 
posted.
I apologize for the delayed reply.

Cheers,
Divy
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