linux-kernel - Re: [PATCH v2] staging: tidspbridge: protect dmm

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Message-ID: <AANLkTi=wBG9AXvDva-_uNjGbRphrb356gZ6ChMJjP8aL@mail.gmail.com>
Date:	Tue, 28 Dec 2010 14:37:26 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Felipe Contreras <felipe.contreras@...ia.com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	greg@...ah.com, omar.ramirez@...com, fernando.lugo@...com,
	nm@...com, ameya.palande@...ia.com, h-kanigeri2@...com
Subject: Re: [PATCH v2] staging: tidspbridge: protect dmm_map properly

On Tue, Dec 28, 2010 at 2:24 PM, Felipe Contreras
<felipe.contreras@...il.com> wrote:
> user-space crashed, not kernel-space; the code would continue to run
> and eventually release the lock.

So you'll have to be more specific about the scenario you are describing.

If there's a user thread that is still running the proc_*_dma()
function, and we agree that this thread keeps running until completion
and then returns to user space, what's the problem ?

If that user thread will crash, drv_remove_all_resources() will clean
up all map_obj's.

> Yeah, so the chances of getting this fixed on 2.6.37 are dimmed.

I wouldn't worry about that.. In the worst case, "Cc:
stable@...nel.org" will push the fix into 2.6.37.x..
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