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ASoC: SOF: pcm: harden PCM STOP sequence - #1169
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The old STOP sequence is: 1. stop DMA 2. send STOP ipc
If delay happen before the step 1 and 2, the DMA buffer will be empty in
short time and cause pipeline xrun then stop the pipeline.
Then the step 2 ipc stop will return error as pipeline is already stopped.
Harden the STOP sequence by send STOP IPC before stop DMA.
Signed-off-by: Pan Xiuli xiuli.pan@linux.intel.com