linux-kernel - Re: [alsa-devel] [PATCH 2/5] ASoC: mxs: add .owner to struct snd_soc

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Date:	Fri, 9 Dec 2011 15:36:06 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	alsa-devel@...a-project.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...com>
Subject: Re: [alsa-devel] [PATCH 2/5] ASoC: mxs: add .owner to struct
 snd_soc_card

Hi,

Wolfram Sang writes:
> On Fri, Dec 09, 2011 at 02:38:09PM +0100, Lothar Waßmann wrote:
> > This will prevent the module from being removed from underneath its
> > users
> > 
> > Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
> 
> I can't find any other instance setting owner in snd_soc_card?
> 
Then that other uses are most probably faulty too.

You can easily test it by loading all necessary sound modules,
starting some application that uses the sound device (e.g. alsamixer)
and then removing the snd-soc-mxs-sgtl5000 module.

Without the patch the removal will succeed crashing the
application. With this patch the refcount of the module will be
> 0 as long as an application is using it, preventing the
removal.


Lothar Waßmann
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