[PATCH v2 4/9] ublk: take const ubq pointer in ublk_get_iod()

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

ublk_get_iod() doesn't modify the struct ublk_queue it is passed.
Clarify that by making the argument a const pointer.

Move the function definition earlier in the file so it doesn't need a
forward declaration.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
---
 drivers/block/ublk_drv.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 4967a5d72029..f4c1db2e7f54 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -203,12 +203,17 @@ struct ublk_params_header {
 static void ublk_stop_dev_unlocked(struct ublk_device *ub);
 static void ublk_abort_queue(struct ublk_device *ub, struct ublk_queue *ubq);
 static inline struct request *__ublk_check_and_get_req(struct ublk_device *ub,
 		struct ublk_queue *ubq, int tag, size_t offset);
 static inline unsigned int ublk_req_build_flags(struct request *req);
-static inline struct ublksrv_io_desc *ublk_get_iod(struct ublk_queue *ubq,
-						   int tag);
+
+static inline struct ublksrv_io_desc *
+ublk_get_iod(const struct ublk_queue *ubq, unsigned tag)
+{
+	return &ubq->io_cmd_buf[tag];
+}
+
 static inline bool ublk_dev_is_user_copy(const struct ublk_device *ub)
 {
 	return ub->dev_info.flags & (UBLK_F_USER_COPY | UBLK_F_SUPPORT_ZERO_COPY);
 }
 
@@ -692,16 +697,10 @@ static inline struct ublk_queue *ublk_get_queue(struct ublk_device *dev,
 static inline bool ublk_rq_has_data(const struct request *rq)
 {
 	return bio_has_data(rq->bio);
 }
 
-static inline struct ublksrv_io_desc *ublk_get_iod(struct ublk_queue *ubq,
-		int tag)
-{
-	return &ubq->io_cmd_buf[tag];
-}
-
 static inline struct ublksrv_io_desc *
 ublk_queue_cmd_buf(struct ublk_device *ub, int q_id)
 {
 	return ublk_get_queue(ub, q_id)->io_cmd_buf;
 }
-- 
2.45.2