diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 161e9aa..b1941b8 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -269,9 +269,8 @@
 		 * split it.
 		 */
 		struct bio_pair *bp;
-		bp = bio_split(bio, bio_split_pool, 
-			       (bio->bi_sector + (bio->bi_size >> 9) -
-				(tmp_dev->offset + tmp_dev->size))<<1);
+		bp = bio_split(bio, bio_split_pool,
+			       ((tmp_dev->offset + tmp_dev->size)<<1) - bio->bi_sector);
 		if (linear_make_request(q, &bp->bio1))
 			generic_make_request(&bp->bio1);
 		if (linear_make_request(q, &bp->bio2))