1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 03940bf36f6c..b808cbe22678 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -328,11 +328,17 @@ static void do_region(int op, int op_flags, unsigned region,
                 /*
                  * Allocate a suitably sized-bio.
                  */
-                if ((op == REQ_OP_DISCARD) || (op == REQ_OP_WRITE_SAME))
+                switch (op) {
+                case REQ_OP_DISCARD:
+                        num_bvecs = 0;
+                        break;
+                case REQ_OP_WRITE_SAME:
                         num_bvecs = 1;
-                else
+                        break;
+                default:
                         num_bvecs = min_t(int, BIO_MAX_PAGES,
                                           dm_sector_div_up(remaining, (PAGE_SIZE >> SECTOR_SHIFT)));
+                }
 
                 bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, io->client->bios);
                 bio->bi_iter.bi_sector = where->sector + (where->count - remaining);