linux-kernel - Re: [PATCH] ASoC: Only deregister AC97 dev if it's name was not "AC97"

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Message-ID: <20090316160137.GA24994@rakim.wolfsonmicro.main>
Date:	Mon, 16 Mar 2009 16:01:37 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Atsushi Nemoto <anemo@....ocn.ne.jp>,
	Manuel Lauss <mano@...rinelk.homelinux.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: Only deregister AC97 dev if it's name was not
	"AC97"

On Mon, Mar 16, 2009 at 03:32:50PM +0100, Takashi Iwai wrote:

> Hm, codec->ac97->dev.bus should be NULL unless it's registered,
> so calling soc_ac97_dev_unregister() should be harmless...

Atsushi, are you using ac97.c as your codec driver?  Could you please
post the actual backtrace you're seeing?

> Maybe I miss something?

There's some fun and games here due to ac97.c which provides the ability
to use the standard ALSA AC97 functionality as a codec driver (that's
why there's the check on init) - I suspect there may be a double free.
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