This is a note to let you know that I've just added the patch titled
block: clear ->slave_dir when dropping the main slave_dir reference
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
block-clear-slave_dir-when-dropping-the-main-slave_d.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3b790cd7d9876f3decb9acf520ab16ae66df107e
Author: Christoph Hellwig <hch@xxxxxx>
Date: Tue Nov 15 22:10:45 2022 +0800
block: clear ->slave_dir when dropping the main slave_dir reference
[ Upstream commit d90db3b1c8676bc88b4309c5a571333de2263b8e ]
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@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Reviewed-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221115141054.1051801-2-yukuai1@xxxxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/block/genhd.c b/block/genhd.c
index 68065189ca17..a1d9e785dcf7 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -530,6 +530,7 @@ int device_add_disk(struct device *parent, struct gendisk *disk,
rq_qos_exit(disk->queue);
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:
@@ -624,6 +625,7 @@ 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;
