linux-kernel - Re: [alsa-devel] unload Audio drivers while playback stream is active case kernel crash

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Message-ID: <CAOMZO5AQEyb9in0hRn+7zcpE5r8zwVUFjCqAqNOmLMCGYka3Pg@mail.gmail.com>
Date:	Wed, 14 Jan 2015 11:43:54 -0200
From:	Fabio Estevam <festevam@...il.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.de>,
	"Wang, Jiada (ESD)" <Jiada_Wang@...tor.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"Frkuska, Joshua" <Joshua_Frkuska@...tor.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>
Subject: Re: [alsa-devel] unload Audio drivers while playback stream is active
 case kernel crash

On Wed, Jan 14, 2015 at 10:57 AM, Lars-Peter Clausen <lars@...afoo.de> wrote:

> My personal opinion on this is that disallowing module removal while a
> driver registered by the module when is in use, while there is no technical
> reason to do so, is a anti-feature. Whether in ALSA or elsewhere.
>
> But looking at the source it seems that this is a core feature of ALSA and
> at least for the card module itself it will do the ref-counting when a
> stream is started/stopped. And we even support setting the owner of a card
> in ASoC. It's just that pretty much no ASoC card driver bothers to set the
> owner field in the snd_soc_card struct. So this particular problem can be
> fixed by updating the imx-wm8962 driver to set the owner field.

Thanks, Lars_Peter. This fixes the issue:

root@...escale /$ modprobe -r snd_soc_imx_wm8962
modprobe: can't unload module snd_soc_imx_wm8962: Resource temporarily
unavailable

Will send a patch with your suggestion soon.
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