Re: [PATCH v12 08/12] ALSA: pcm: report partial progress under the stream lock

[sashiko-bot@kernel.org]

> Staged capture can make readable data available before a complete period
> has elapsed. Skipping notification leaves a blocked reader asleep, while
> using the period-interrupt path for this event can infer a false ring wrap
> when the notification is delayed.
> 
> Add snd_pcm_progress_under_stream_lock() to update the hardware pointer
> through the non-interrupt path and notify readers and fasync listeners.
> It runs under the caller's PCM stream lock and does not tick the PCM timer.
> The driver must release its pointer and trigger locks before calling it.
> Existing period notification callers keep their current behavior.
> 
> Atomic and nonatomic synthetic PCM tests reproduced the missing wakeup
> and false-wrap alternatives. The new helper delivered 64 final frames and
> reported four available frames after delayed partial progress without XRUN.
> 
> Assisted-by: LLM
> Signed-off-by: Joonho Lee <mynameisjune111@gmail.com>

Sashiko has reviewed this patch and found no issues.

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