linux-kernel - Re: [PATCH] staging: tidspbridge: protect dmm

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Message-ID: <AANLkTimsrmGdBEEpV7OPFtGG=yRfeVBPxGP5y8gkUHfJ@mail.gmail.com>
Date:	Mon, 7 Mar 2011 13:29:02 -0600
From:	"Ramirez Luna, Omar" <omar.ramirez@...com>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Felipe Contreras <felipe.contreras@...ia.com>,
	linux-main <linux-kernel@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Ohad Ben-Cohen <ohad@...ery.com>,
	Fernando Guzman Lugo <fernando.lugo@...com>,
	Nishanth Menon <nm@...com>,
	Ameya Palande <ameya.palande@...ia.com>
Subject: Re: [PATCH] staging: tidspbridge: protect dmm_map properly

Hi Felipe,

On Mon, Mar 7, 2011 at 12:02 PM, Felipe Contreras
<felipe.contreras@...il.com> wrote:
> On Mon, Dec 20, 2010 at 7:12 PM, Felipe Contreras
> <felipe.contreras@...ia.com> wrote:
>> We need to protect not only the dmm_map list, but the individual
>> map_obj's, otherwise, we might be building the scatter-gather list with
>> garbage. So, use the existing proc_lock for that.
>>
>> I observed race conditions which caused kernel panics while running
>> stress tests. This patch fixes those.
>
> I just heard that Tuomas Kulve is getting a lot of panics on Gumstix
> Overo. I propose we apply this patch on the stable tree ASAP, and if
> there's no better proposals, also on .38.

Can you or Tuomas share the bug report data (panic log, test case
maybe)? I would like to discard issues affected by timing that could
be hidden with this patch.

I agree that for the time being this needs to be sent upstream, even
if in paper Ohad's patch solves the issue without side effects of
locking.

Thanks,

Omar
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