> Keep the control queue available through snd_card_free() so close-time
> STOP and RELEASE commands can still be submitted. Block new control
> requests and mark pending messages canceled before reset, then release
> their queue references only after reset and queue deletion.
>
> For PCM queues, detach each remaining virtqueue buffer after the device
> has stopped DMA and retire its message without reporting a normal
> completion. Detach all queues before deleting them so outstanding DMA
> mappings are unmapped and no token remains for a late device completion.
>
> Protect event callback admission with the event queue lock. Disabling
> events waits for an active dispatch, and later callbacks see a closed
> gate before ALSA objects are freed. Enable and pending-event draining
> share the same lock.
>
> Reclaim pending event buffers after a failed probe without dispatching
> notifications into ALSA objects that have not been constructed. Record
> the queue's prior enabled state under its lock before closing admission.
>
> Fixes: 9d45e514da88 ("ALSA: virtio: handling control messages")
>
> Track virtqueue initialization across partial restore so rollback deletes
> only queues created by the current attempt. Clear freed event-message
> ownership before a later remove can reclaim it.
> Signed-off-by: Joonho Lee <[email protected]>
Sashiko has reviewed this patch and found no issues.
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https://sashiko.dev/#/patchset/[email protected]?part=6
