[PATCH 1/2] ublk: specify io_cmd_buf pointer type

[Caleb Sander Mateos]

io_cmd_buf points to an array of ublksrv_io_desc structs but its type is
char *. Indexing the array requires an explicit multiplication and cast.
The compiler also can't check the pointer types.

Change io_cmd_buf's type to struct ublksrv_io_desc * so it can be
indexed directly and the compiler can type-check the code.

Signed-off-by: Caleb Sander Mateos <csan...@purestorage.com>
---
 drivers/block/ublk_drv.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 355a59c78539..ed73e2ffdf09 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -153,11 +153,11 @@ struct ublk_queue {
        int q_id;
        int q_depth;
 
        unsigned long flags;
        struct task_struct      *ubq_daemon;
-       char *io_cmd_buf;
+       struct ublksrv_io_desc *io_cmd_buf;
 
        bool force_abort;
        bool timeout;
        bool canceling;
        bool fail_io; /* copy of dev->state == UBLK_S_DEV_FAIL_IO */
@@ -701,15 +701,15 @@ static inline bool ublk_rq_has_data(const struct request 
*rq)
 }
 
 static inline struct ublksrv_io_desc *ublk_get_iod(struct ublk_queue *ubq,
                int tag)
 {
-       return (struct ublksrv_io_desc *)
-               &(ubq->io_cmd_buf[tag * sizeof(struct ublksrv_io_desc)]);
+       return &ubq->io_cmd_buf[tag];
 }
 
-static inline char *ublk_queue_cmd_buf(struct ublk_device *ub, int q_id)
+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;
 }
 
 static inline int __ublk_queue_cmd_buf_size(int depth)
-- 
2.45.2