[PATCH v2 4/4] ASoC: apple: mca: Add locks on foreign cluster access

[Mark Brown]

On Fri, Aug 19, 2022 at 02:54:30PM +0200, Martin Povišer wrote:
> In DAI ops, accesses to the native cluster (of the DAI), and to data of
> clusters related to it by a DPCM frontend-backend link, should have
> been synchronized by the 'pcm_mutex' lock at ASoC level.
> 
> What is not covered are the 'port_driver' accesses on foreign clusters
> to which the current cluster has no a priori relation, so fill in
> locking for that. (This should only matter in bizarre configurations of
> sharing one MCA peripheral between ASoC cards.)

This also looks good.
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