From: Christoph Hellwig hch@lst.de
mainline inclusion from mainline-v6.2-rc1 commit d90db3b1c8676bc88b4309c5a571333de2263b8e category: bugfix bugzilla: 188733
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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 conflict: block/genhd.c Signed-off-by: Zhong Jinghua zhongjinghua@huawei.com Signed-off-by: Li Nan linan122@huawei.com --- block/genhd.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/block/genhd.c b/block/genhd.c index d03588201416..ff61a19b2260 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -908,6 +908,7 @@ static int __device_add_disk(struct device *parent, struct gendisk *disk, sysfs_remove_link(&ddev->kobj, "bdi"); out_put_slave_dir: kobject_put(disk->slave_dir); + disk->slave_dir = NULL; out_put_holder_dir: kobject_put(disk->part0.holder_dir); out_del_integrity: @@ -1059,6 +1060,7 @@ void del_gendisk(struct gendisk *disk)
kobject_put(disk->part0.holder_dir); kobject_put(disk->slave_dir); + disk->slave_dir = NULL;
part_stat_set_all(&disk->part0, 0); disk->part0.stamp = 0;