[alsa-devel] snd_pcm_drop causing lockup with DMix

[Jaroslav Kysela]

On Wed, 3 Mar 2010, John Lindgren wrote:

> Confirmed, that fixes the hangup.  A minor issue remains that
> snd_pcm_writei still always returns -EIO or -EBADFD in this situation.

I don't see a problem here. If transfer is stopped, the pcm handle is 
not initialized for I/O transactions, thus upper layers return these 
errors.

Your application should check snd_pcm_state() in case of error and look if 
stream is inactive (back in SND_PCM_STATE_SETUP), because your application 
invoked the drop() call.

 						Jaroslav

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Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.