linux-kernel - [PATCH AUTOSEL 5.18 23/53] block: freeze the queue earlier in del

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Date:   Mon, 27 Jun 2022 22:18:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>, linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 5.18 23/53] block: freeze the queue earlier in del_gendisk

From: Christoph Hellwig <hch@....de>

[ Upstream commit a09b314005f3a0956ebf56e01b3b80339df577cc ]

Freeze the queue earlier in del_gendisk so that the state does not
change while we remove debugfs and sysfs files.

Ming mentioned that being able to observer request in debugfs might
be useful while the queue is being frozen in del_gendisk, which is
made possible by this change.

Signed-off-by: Christoph Hellwig <hch@....de>
Link: https://lore.kernel.org/r/20220614074827.458955-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/genhd.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 3008ec213654..204ee91602c2 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -623,6 +623,7 @@ void del_gendisk(struct gendisk *disk)
 	 * Prevent new I/O from crossing bio_queue_enter().
 	 */
 	blk_queue_start_drain(q);
+	blk_mq_freeze_queue_wait(q);
 
 	if (!(disk->flags & GENHD_FL_HIDDEN)) {
 		sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
@@ -646,8 +647,6 @@ void del_gendisk(struct gendisk *disk)
 	pm_runtime_set_memalloc_noio(disk_to_dev(disk), false);
 	device_del(disk_to_dev(disk));
 
-	blk_mq_freeze_queue_wait(q);
-
 	blk_throtl_cancel_bios(disk->queue);
 
 	blk_sync_queue(q);
-- 
2.35.1