[PATCH 6.5 358/739] md/raid1: free the r1bio before waiting for blocked rdev

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6.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xueshi Hu <xueshi.hu@xxxxxxxxxx>

[ Upstream commit 992db13a4aee766c8bfbf046ad15c2db5fa7cab8 ]

Raid1 reshape will change mempool and r1conf::raid_disks which are
needed to free r1bio. allow_barrier() make a concurrent raid1_reshape()
possible. So, free the in-flight r1bio before waiting blocked rdev.

Fixes: 6bfe0b499082 ("md: support blocking writes to an array on device failure")
Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Signed-off-by: Xueshi Hu <xueshi.hu@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230814135356.1113639-3-xueshi.hu@xxxxxxxxxx
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/md/raid1.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index dd25832eb0452..f6a33c7824a70 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1373,6 +1373,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 		return;
 	}
 
+ retry_write:
 	r1_bio = alloc_r1bio(mddev, bio);
 	r1_bio->sectors = max_write_sectors;
 
@@ -1388,7 +1389,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 	 */
 
 	disks = conf->raid_disks * 2;
- retry_write:
 	blocked_rdev = NULL;
 	rcu_read_lock();
 	max_sectors = r1_bio->sectors;
@@ -1468,7 +1468,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 		for (j = 0; j < i; j++)
 			if (r1_bio->bios[j])
 				rdev_dec_pending(conf->mirrors[j].rdev, mddev);
-		r1_bio->state = 0;
+		free_r1bio(r1_bio);
 		allow_barrier(conf, bio->bi_iter.bi_sector);
 
 		if (bio->bi_opf & REQ_NOWAIT) {
-- 
2.40.1






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