[PATCH] ublk: return unsigned from ublk_{,un}map_io()

[Caleb Sander Mateos <csander@purestorage.com>]

ublk_map_io() and ublk_unmap_io() never return negative values, and
their return values are stored in variables of type unsigned. Clarify
that they can't fail by making their return types unsigned.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
---
 drivers/block/ublk_drv.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 5cf288809226..5777586e4be3 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -961,12 +961,13 @@ static inline bool ublk_need_unmap_req(const struct request *req)
 {
 	return ublk_rq_has_data(req) &&
 	       (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_DRV_IN);
 }
 
-static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
-		       const struct ublk_io *io)
+static unsigned int ublk_map_io(const struct ublk_queue *ubq,
+				const struct request *req,
+				const struct ublk_io *io)
 {
 	const unsigned int rq_bytes = blk_rq_bytes(req);
 
 	if (!ublk_need_map_io(ubq))
 		return rq_bytes;
@@ -984,11 +985,11 @@ static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
 		return ublk_copy_user_pages(req, 0, &iter, dir);
 	}
 	return rq_bytes;
 }
 
-static int ublk_unmap_io(bool need_map,
+static unsigned int ublk_unmap_io(bool need_map,
 		const struct request *req,
 		const struct ublk_io *io)
 {
 	const unsigned int rq_bytes = blk_rq_bytes(req);
 
-- 
2.45.2