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

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Message-ID: <20110307184800.GA13355@kroah.com>
Date:	Mon, 7 Mar 2011 10:48:00 -0800
From:	Greg KH <greg@...ah.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>,
	Omar Ramirez Luna <omar.ramirez@...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

On Mon, Mar 07, 2011 at 08:02:44PM +0200, Felipe Contreras 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.

Um, I don't think you realize _how_ stable trees work, please go read
Documentation/stable_kernel_rules.txt to see how it is not possible to
take something into the stable releases before it goes to Linus's tree.

Sorry,

greg k-h
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