dm: remove check that prevents mapping empty bios

Remove the check that the size of the cloned bio is not zero because a
subsequent patch needs to send zero-sized barriers down this path.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8498dc4ce1f..7d9ca709433 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -637,11 +637,6 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
         sector_t sector;
         struct mapped_device *md;
 
-        /*
-         * Sanity checks.
-         */
-        BUG_ON(!clone->bi_size);
-
         clone->bi_end_io = clone_endio;
         clone->bi_private = tio;