[alsa-devel] OOPS: Vmaster not freed on reconfig

[Takashi Iwai]

At Tue, 08 Nov 2011 17:16:56 +0100,
David Henningsson wrote:
> 
> Hi,
> 
> I'm playing around with the reconfig functions of snd-hda-codec and got 
> an OOPS in slave_put. I tried to research this, and I think I've nailed 
> down the problem: the vmaster is not freed on reconfig (presumably, it 
> should be fixed in hda_codec.c:snd_hda_ctls_clear).

Hmm, I don't figure out how it happens.
The vmaster is added to the list via snd_hda_add_vmaster() by calling
snd_hda_ctl_add().

> I'm a little unsure of whether the best thing is to just add it to 
> codec.mixers, keep them in a separate array, or something else. What do 
> you think?
> 
> (It's on 3.0, it's a sigmatel/IDT, and I've got the screen captured by a 
> camera if anyone is interested.)

Yes, it'd be interesting.  If the bug is easily reproducible, you can
capture the oops text by netconsole, too.


thanks,

Takashi