This is a note to let you know that I've just added the patch titled
blk-mq: don't plug for head insertions in blk_execute_rq_nowait
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
blk-mq-don-t-plug-for-head-insertions-in-blk_execute.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cd753cafcc904fb4926189ca61eba7e170e453f6
Author: Christoph Hellwig <hch@xxxxxx>
Date: Thu Apr 13 08:40:38 2023 +0200
blk-mq: don't plug for head insertions in blk_execute_rq_nowait
[ Upstream commit 50947d7fe9fa6abe3ddc40769dfb02a51c58edb6 ]
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>
Link: https://lore.kernel.org/r/20230413064057.707578-2-hch@xxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index f5bec5258d32b..ae08c4936743d 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1345,7 +1345,7 @@ 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);
