[alsa-devel] [PATCH 15/20] ASoC: fsl: make fsl_ssi driver compilable on ARM/IMX

[Russell King - ARM Linux]

On Mon, Mar 05, 2012 at 12:26:36AM +0000, Mark Brown wrote:
> On Mon, Mar 05, 2012 at 12:13:52AM +0000, Tabi Timur-B04825 wrote:
> 
> > To answer your question: I was lead to believe that the individual ALSA 
> > callback functions are atomic.  So one thread should not be trying to 
> > start playback while another thread is simultaneously trying to stop it.
> 
> That's correct, there's ALSA level locking.

Please explain which lock prevents the capture substream trigger callback
occuring simultaneously with a playback substream trigger callback on a
SMP system.

Thanks.