linux-kernel - Re: [PATCH v3 1/4] ASoc: kirkwood: simplify probe error

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Message-ID: <20130803185255.1b1932c4@armhf>
Date:	Sat, 3 Aug 2013 18:52:55 +0200
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Rob Herring <rob.herring@...xeda.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/4] ASoc: kirkwood: simplify probe error

On Sat, 3 Aug 2013 13:46:52 +0100
Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> On Wed, Jul 31, 2013 at 08:17:39AM +0200, Jean-Francois Moine wrote:
> > The function kirkwood_i2s_dev_remove() may be used when probe fails.
> 
> Looking at this deeper, I'm not happy with this.
	[snip]
> What this means is that if snd_soc_register_component() fails, we end
> up calling snd_soc_unregister_component().  This may be fine with the
> way snd_soc_unregister_component() is currently implemented, but you're
> making the assumption that it's fine to call snd_soc_unregister_component()
> for a device which hasn't been registered.  Technically, this is a
> layering violation, which makes this change fragile if the behaviour
> of snd_soc_unregister_component() changes in the future.
> 
> For the sake of two calls in the error path, I don't think the benefits
> of this patch outweigh the risk.

You are right, but if snd_soc_unregister_component() could be
officially used safely with no previous call to
snd_soc_register_component(), this would simplify error handling in
other drivers too...

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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