FAILED: patch "[PATCH] blk-mq: end the request if getting a keyslot fails" failed to apply to 6.12-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x e67cb6ed40e7f45912b63d7d575f18dfd2ebc98a
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261109200831-failed-6.12-e67cb6ed40e7@kernel.org' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From e67cb6ed40e7f45912b63d7d575f18dfd2ebc98a Mon Sep 17 00:00:00 2001
From: Josef Bacik <josef@toxicpanda.com>
Date: Thu, 29 Oct 2026 20:01:10 +0000
Subject: [PATCH] blk-mq: end the request if getting a keyslot fails

When blk_crypto_rq_get_keyslot() fails, blk_mq_submit_bio() ends the bio
by hand and frees the request. By then blk_mq_bio_to_request() has done
the IO accounting, which blk_mq_free_request() doesn't undo, so the
in_flight counter never drops and iostat shows a device that is 100%
busy. If the bio went through zone write plugging the zone stays plugged
as well, and every later write to it waits forever.

Use blk_mq_end_request() like the dispatch path does for a request the
driver rejected, after marking it for zone write plugging.

Move the call to blk_zone_write_plug_init_request() before
blk_crypto_rq_get_keyslot() so that it doesn't need to be duplicated.
It doesn't depend on the keyslot.

Fixes: 99dc422335d8 ("block: support to account io_ticks precisely")
Fixes: dd291d77cc90 ("block: Introduce zone write plugging")
Cc: stable@vger.kernel.org
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20261029200110.1328103-1-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/blk-mq.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index d9ab295be4d92..e5b9898cede98 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3209,16 +3209,15 @@ void blk_mq_submit_bio(struct bio *bio)
 
 	blk_mq_bio_to_request(rq, bio, nr_segs);
 
+	if (bio_zone_write_plugging(bio))
+		blk_zone_write_plug_init_request(rq);
+
 	ret = blk_crypto_rq_get_keyslot(rq);
 	if (ret != BLK_STS_OK) {
-		bio_endio_status(bio, ret);
-		blk_mq_free_request(rq);
+		blk_mq_end_request(rq, ret);
 		return;
 	}
 
-	if (bio_zone_write_plugging(bio))
-		blk_zone_write_plug_init_request(rq);
-
 	if (op_is_flush(bio->bi_opf) && blk_insert_flush(rq))
 		return;
 
-- 
2.53.0