On 4/12/23 14:32, Christoph Hellwig wrote:
> Plugs never insert at head, so don't plug for head insertions.
>
> Fixes: 1c2d2fff6dc0 ("block: wire-up support for passthrough plugging")
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
> ---
> block/blk-mq.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 52f8e0099c7f4b..7908d19f140815 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -1299,7 +1299,7 @@ void blk_execute_rq_nowait(struct request *rq, bool at_head)
> * device, directly accessing the plug instead of using blk_mq_plug()
> * should not have any consequences.
> */
> - if (current->plug)
> + if (current->plug && !at_head)
> blk_add_rq_to_plug(current->plug, rq);
> else
> blk_mq_sched_insert_request(rq, at_head, true, false);
