From: Christoph Hellwig <hch@lst.de>
Date: Tue, 15 Nov 2022 14:10:45 +0000 (+0800)
Subject: block: clear ->slave_dir when dropping the main slave_dir reference
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d90db3b1c8676bc88b4309c5a571333de2263b8e;p=linux.git

block: clear ->slave_dir when dropping the main slave_dir reference

Zero out the pointer to ->slave_dir so that the holder code doesn't
incorrectly treat the object as alive when add_disk failed or after
del_gendisk was called.

Fixes: 89f871af1b26 ("dm: delay registering the gendisk")
Reported-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Mike Snitzer <snitzer@kernel.org>
Link: https://lore.kernel.org/r/20221115141054.1051801-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/genhd.c b/block/genhd.c
index 09cde914e0548..6271ad06ed07e 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -528,6 +528,7 @@ out_unregister_queue:
 	blk_unregister_queue(disk);
 out_put_slave_dir:
 	kobject_put(disk->slave_dir);
+	disk->slave_dir = NULL;
 out_put_holder_dir:
 	kobject_put(disk->part0->bd_holder_dir);
 out_del_integrity:
@@ -629,6 +630,7 @@ void del_gendisk(struct gendisk *disk)
 
 	kobject_put(disk->part0->bd_holder_dir);
 	kobject_put(disk->slave_dir);
+	disk->slave_dir = NULL;
 
 	part_stat_set_all(disk->part0, 0);
 	disk->part0->bd_stamp = 0;