It doesn't incur any harm now when the range parameter of blk_register_region() is zero, but let's skip the useless call of blk_register_region() for disk which uses ext-dev. Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx> --- block/genhd.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 26b31fcae217..c61b59b550b0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -739,8 +739,9 @@ static void __device_add_disk(struct device *parent, struct gendisk *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); + if (disk->minors) + blk_register_region(disk_devt(disk), disk->minors, NULL, + exact_match, exact_lock, disk); } register_disk(parent, disk, groups); if (register_queue) -- 2.22.0
