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[TEST ONLY] ASoC: core: Move pcm_mutex up to card level from snd_soc_pcm_runtime #1132

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[TEST ONLY] ASoC: core: Move pcm_mutex up to card level from snd_soc_pcm_runtime #1132

wants to merge 1 commit into from

Commits on Aug 14, 2019

  1. ASoC: core: Move pcm_mutex up to card level from snd_soc_pcm_runtime 

    The pcm_mutex is used to prevent concurrent execution of snd_pcm_ops
callbacks. This works fine most of the cases but it can not handle setups
when the same DAI is used by different rtd, for example:
pcm3168a have two DAIs: one for Playback and one for Capture.
If the codec is connected to a single CPU DAI we need to have two dai_link
to support both playback and capture.

In this case the snd_pcm_ops callbacks can be executed in parallel causing
unexpected races in DAI drivers.

By moving the pcm_mutex up to card level this can be solved
while - hopefully - not breaking other setups.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
    @plbossart
    Peter Ujfalusi authored and plbossart committed Aug 14, 2019
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