scsi: ufs: core: Simplify ufshcd_execute_start_stop()

Use scsi_execute_cmd() instead of open-coding it.

Link: https://lore.kernel.org/r/20230210193258.4004923-4-bvanassche@acm.org
Cc: Mike Christie <michael.christie@oracle.com>
Cc: John Garry <john.g.garry@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Asutosh Das <quic_asutoshd@quicinc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/ufs/core/ufshcd.c

@@ -9134,34 +9134,15 @@ static int ufshcd_execute_start_stop(struct scsi_device *sdev,
 				     enum ufs_dev_pwr_mode pwr_mode,
 				     struct scsi_sense_hdr *sshdr)
 {
-	unsigned char cdb[6] = { START_STOP, 0, 0, 0, pwr_mode << 4, 0 };
-	struct request *req;
-	struct scsi_cmnd *scmd;
-	int ret;
-
-	req = scsi_alloc_request(sdev->request_queue, REQ_OP_DRV_IN,
-				 BLK_MQ_REQ_PM);
-	if (IS_ERR(req))
-		return PTR_ERR(req);
-
-	scmd = blk_mq_rq_to_pdu(req);
-	scmd->cmd_len = COMMAND_SIZE(cdb[0]);
-	memcpy(scmd->cmnd, cdb, scmd->cmd_len);
-	scmd->allowed = 0/*retries*/;
-	scmd->flags |= SCMD_FAIL_IF_RECOVERING;
-	req->timeout = 1 * HZ;
-	req->rq_flags |= RQF_QUIET;
-
-	blk_execute_rq(req, /*at_head=*/true);
-
-	if (sshdr)
-		scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
-				     sshdr);
-	ret = scmd->result;
-
-	blk_mq_free_request(req);
+	const unsigned char cdb[6] = { START_STOP, 0, 0, 0, pwr_mode << 4, 0 };
+	const struct scsi_exec_args args = {
+		.sshdr = sshdr,
+		.req_flags = BLK_MQ_REQ_PM,
+		.scmd_flags = SCMD_FAIL_IF_RECOVERING,
+	};
 
-	return ret;
+	return scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, /*buffer=*/NULL,
+			/*bufflen=*/0, /*timeout=*/HZ, /*retries=*/0, &args);
 }
 
 /**