[alsa-devel] [PATCH] ASoC: dapm: Fix locking during codec shutdown

[Mark Brown]

On Fri, Jul 06, 2012 at 04:57:05PM +0100, Liam Girdwood wrote:
> Codec shutdown performs a DAPM power sequence that might cause conflicts
> and/or race conditions if another stream power event is running simultaneously.
> Use card's dapm mutex to protect any potential race condition between them.

There's a bigger problem here if we're managing to run into this - the
shutdown function is only supposed to be being called while the system
is in the middle of shutting down so we've probably got a bunch of other
races further up the stack to worry about too...
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