ASoC: SOF: PCM: add period_elapsed work to fix race condition in interrupt context
The IPC implementation in SOF requires sending IPCs serially: we should not send a new IPC command to the firmware before we get an ACK (or time out) from firmware, and the IRQ processing is complete. snd_pcm_period_elapsed() can be called in interrupt context before IRQ_HANDLED is returned. When the PCM is done draining, a STOP IPC will then be sent, which breaks the expectation that IPCs are handled serially and leads to IPC timeouts. This patch adds a workqueue to defer the call to snd_pcm_elapsed() after the IRQ is handled. Signed-off-by:Keyon Jie <yang.jie@linux.intel.com> Signed-off-by:
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by:
Mark Brown <broonie@kernel.org>
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