Virtualization - Dec 2022 - [PATCH v2 1/2] virtio-blk: set req->state to MQ_RQ_COMPLETE after polling I/O is finished

On Wed, Dec 21, 2022 at 12:36:12AM +0900, Suwan Kim
wrote:
> Driver should set req->state to MQ_RQ_COMPLETE after it finishes to
process
> req. But virtio-blk doesn't set MQ_RQ_COMPLETE after virtblk_poll()
handles
> req and req->state still remains MQ_RQ_IN_FLIGHT. Fortunately so far
there
> is no issue about it because blk_mq_end_request_batch() sets req->state
to
> MQ_RQ_IDLE.
> 
> In this patch, virblk_poll() calls blk_mq_complete_request_remote() to set
> req->state to MQ_RQ_COMPLETE before it adds req to a batch completion
list.
> So it properly sets req->state after polling I/O is finished.
> 
> Fixes: 4e0400525691 ("virtio-blk: support polling I/O")
> Signed-off-by: Suwan Kim <suwan.kim027 at gmail.com>
Looks good:

Reviewed-by: Christoph Hellwig <hch at lst.de>