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

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Message-ID: <20150114163415.GV4160@sirena.org.uk>
Date:	Wed, 14 Jan 2015 16:34:15 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"Wang, Jiada (ESD)" <Jiada_Wang@...tor.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"Frkuska, Joshua" <Joshua_Frkuska@...tor.com>
Subject: Re: [alsa-devel] unload Audio drivers while playback stream is
 active case kernel crash

On Wed, Jan 14, 2015 at 02:01:33PM +0100, Takashi Iwai wrote:
> Mark Brown wrote:

> > > Above all, disallowing the module unload while using is the common
> > > behavior of any other drivers.  Why do we have to be a rebel against
> > > all civil manner? :)

> > That's not true for everything

> Hmm, which driver does behave so intentionally?  I'm interested in the
> supposed reason behind it.

Relatively few of the subsystems in drivers have references to
module_get().

> > and for ASoC I'd tend to assume that the
> > user knows what they're doing and has a good reason for it; it's
> > certainly something that can be helpful in development.

> The module unload is never considered to be equivalent with hot
> unplug  It's more than that.

I'm not sure that's the case from a user perspective.

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