[alsa-devel] 2.6.31.x vs. rme vs. alsa 1.0.22?

[Fernando Lopez-Lezcano]

On Mon, 2010-02-22 at 23:51 +0000, Fernando Lopez-Lezcano wrote:
> On Tue, 2010-02-16 at 17:58 -0800, Fernando Lopez-Lezcano wrote:
> > Hey, has anyone been seeing strange behavior from this combination?
> > 
> >   kernel 2.6.31.x rt20 + alsa 1.0.22 userland
> >   RME card (pcmcia card + multiface)
> > 
> > hdspmixer is not doing the right thing (does not initialize the card in
> > a way in which playback works), it does not see the hwdep interface (or
> > something like that) and disables metering,
[MUNCH]
> I have been trying to see if I can figure _anything_ out of this...
> 
> A diff of 2.6.29 (last known working) against 2.6.31.12 reveals
> something that might have an influence on the problem:
> 
> in snd_hdsp_create_hwdep there are two lines added:
> 
> + hw->ops.open = snd_hdsp_hwdep_dummy_op;

Hmmm, looks like snd_hdsp_hwdep_dummy_op is not passing back the
hdsp->hwdep structure to the open call at all (returning 0 is not enough
from the description of the alsa api). That would explain what is
happening, most probably no ioctls are found...

Am I on the right track?
-- Fernando


>   hw->ops.ioctl = snd_hdsp_hwdep_ioctl;
> + hw->ops.release = snd_hdsp_hwdep_dummy_op;
> 
> And snd_hdsp_hwdep_dummy_op just returns 0...
> 
> Other differences between the two files (not that many) seem irrelevant
> to me. 
> 
> I imagine this is what is causing the difference in behavior (hwdep
> fails). Any suggestions on what I could try to fix this?
> 
> Thanks for any help!