[PATCH v2 3/3] block: add WARN_ON if bdi register fail

[weiping zhang]

device_add_disk need do more safety error handle, so this patch just
add WARN_ON.

Reviewed-by: Jan Kara <j...@suse.cz>
Signed-off-by: weiping zhang <zhangweip...@didichuxing.com>
---
 block/genhd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index dd305c65ffb0..52834433878c 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -660,7 +660,7 @@ void device_add_disk(struct device *parent, struct gendisk 
*disk)
 
        /* Register BDI before referencing it from bdev */
        bdi = disk->queue->backing_dev_info;
-       bdi_register_owner(bdi, disk_to_dev(disk));
+       WARN_ON(bdi_register_owner(bdi, disk_to_dev(disk)));
 
        blk_register_region(disk_devt(disk), disk->minors, NULL,
                            exact_match, exact_lock, disk);
-- 
2.14.2