block: add WARN_ON if bdi register fail
device_add_disk need do more safety error handle, so this patch just
add WARN_ON.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Adapted for current series by me.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/genhd.c b/block/genhd.c
index c2223f1..c143a22 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -671,10 +671,13 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO;
disk->flags |= GENHD_FL_NO_PART_SCAN;
} else {
+ int ret;
+
/* Register BDI before referencing it from bdev */
disk_to_dev(disk)->devt = devt;
- bdi_register_owner(disk->queue->backing_dev_info,
- disk_to_dev(disk));
+ ret = bdi_register_owner(disk->queue->backing_dev_info,
+ disk_to_dev(disk));
+ WARN_ON(ret);
blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
}