linux-kernel - Re: kernel OOPS when releasing usb webcam (random)

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Message-Id: <20111018104054.07aa2bcf462c0268a23c0139@studenti.unina.it>
Date:	Tue, 18 Oct 2011 10:40:54 +0200
From:	Antonio Ospite <ospite@...denti.unina.it>
To:	David Rientjes <rientjes@...gle.com>
Cc:	"Tomas M." <tmezzadra@...il.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: kernel OOPS when releasing usb webcam (random)

On Mon, 17 Oct 2011 17:05:19 -0700 (PDT)
David Rientjes <rientjes@...gle.com> wrote:

> On Mon, 17 Oct 2011, Tomas M. wrote:
> 
> > im getting the following null pointer dereference from time to time when
> > releasing a usb camera.
> > 
> > maybe this trace is of assistance...please reply to my mail since im not
> > subscribed.
> > 
> 
> I suspect this is happening in v4l2_device_unregister_subdev().  Adding 
> Guennadi, Mauro, and linux-media.
> 
> > BUG: unable to handle kernel NULL pointer dereference at 0000006c
> > IP: [<f90be6c2>] v4l2_device_release+0xa2/0xf0 [videodev]

Hi,

I sent a fix for a similar trace last week:
http://patchwork.linuxtv.org/patch/8124/

Tomas, can you test it fixes the problem for you too?

Thanks,
   Antonio

-- 
Antonio Ospite
http://ao2.it

PGP public key ID: 0x4553B001

A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?

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