Re: [PATCH v18 04/12] ALSA: virtio: Propagate PCM send failures through ACK

[sashiko-bot@kernel.org]

> virtsnd_pcm_msg_send() can fail while queueing a transfer. Restore the
> failed message's length and notify the device about earlier messages
> queued by the same call, so they do not remain stranded.
> 
> Propagate errors through the indirect transfer callback and commit its
> private cursor only after successful submission. Genuine transfer errors
> arm stop_operating and return -EPIPE so ALSA can retire the stream.
> 
> Close ACK admission under the PCM stream lock before sleeping teardown.
> Keep the prepared state protected by the substream lock and reject ACK
> through prepare and parameter changes. Reopen admission in the reset
> callback while the core holds the PCM lock for its pointer rebase. An
> ACK racing with teardown returns -EBADFD and preserves stop state.
> 
> Keep the polling feature path unchanged.
> 
> Fixes: fe981e67568c ("ALSA: virtio: use ack callback")
> 
> Reject a stopped playback ACK before the XRUN path can rearm
> stop_operating. For capture, allow the ordinary stopped tail only during
> DRAINING and only while no transfer XRUN is latched.
> 
> Latch a transfer failure before stopping PCM work. Once core reports the member XRUN, ACK returns -EBADFD to avoid another linked XRUN. ACK during prepare remains rejected until the core state reaches PREPARED.
> Signed-off-by: Joonho Lee <mynameisjune111@gmail.com>

Sashiko has reviewed this patch and found no issues.

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