From a4f75764d16bed317276b05a9fe2c179ef61680d Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 1 Jun 2023 11:44:48 +0200
Subject: [PATCH] block: avoid repeated work in blk_mark_disk_dead

Check if GD_DEAD is already set in blk_mark_disk_dead, and don't
duplicate the work already done.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Christian Brauner <brauner@kernel.org>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20230601094459.1350643-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/genhd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index aa327314905e..6fa926a02d85 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -575,7 +575,9 @@ void blk_mark_disk_dead(struct gendisk *disk)
 	/*
 	 * Fail any new I/O.
 	 */
-	set_bit(GD_DEAD, &disk->state);
+	if (test_and_set_bit(GD_DEAD, &disk->state))
+		return;
+
 	if (test_bit(GD_OWNS_QUEUE, &disk->state))
 		blk_queue_flag_set(QUEUE_FLAG_DYING, disk->queue);