scsi: ufs: Improve type safety

Assign names to the enumeration types for UPIU types. Use these enumeration
types where appropriate.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230727194457.3152309-8-bvanassche@acm.orgSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/ufs/core/ufshcd-priv.h

@@ -93,7 +93,7 @@ int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd);
 int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
 			     struct utp_upiu_req *req_upiu,
 			     struct utp_upiu_req *rsp_upiu,
-			     int msgcode,
+			     enum upiu_request_transaction msgcode,
 			     u8 *desc_buff, int *buff_len,
 			     enum query_opcode desc_op);
 

drivers/ufs/core/ufshcd.c

@@ -879,7 +879,7 @@ static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
  *
  * Return: UPIU type.
  */
-static inline int
+static inline enum upiu_response_transaction
 ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
 {
 	return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
@@ -3032,7 +3032,7 @@ ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 static int
 ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 {
-	int resp;
+	enum upiu_response_transaction resp;
 	int err = 0;
 
 	hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
@@ -5271,9 +5271,8 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
 
 	switch (ocs) {
 	case OCS_SUCCESS:
-		result = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
 		hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
-		switch (result) {
+		switch (ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr)) {
 		case UPIU_TRANSACTION_RESPONSE:
 			/*
 			 * get the response UPIU result to extract
@@ -7199,7 +7198,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
 			     struct utp_upiu_req *req_upiu,
 			     struct utp_upiu_req *rsp_upiu,
-			     int msgcode,
+			     enum upiu_request_transaction msgcode,
 			     u8 *desc_buff, int *buff_len,
 			     enum query_opcode desc_op)
 {

include/ufs/ufs.h

@@ -78,7 +78,7 @@ enum {
 };
 
 /* UTP UPIU Transaction Codes Initiator to Target */
-enum {
+enum upiu_request_transaction {
 	UPIU_TRANSACTION_NOP_OUT	= 0x00,
 	UPIU_TRANSACTION_COMMAND	= 0x01,
 	UPIU_TRANSACTION_DATA_OUT	= 0x02,
@@ -87,7 +87,7 @@ enum {
 };
 
 /* UTP UPIU Transaction Codes Target to Initiator */
-enum {
+enum upiu_response_transaction {
 	UPIU_TRANSACTION_NOP_IN		= 0x20,
 	UPIU_TRANSACTION_RESPONSE	= 0x21,
 	UPIU_TRANSACTION_DATA_IN	= 0x22,

include/ufs/ufshcd.h

@@ -1357,12 +1357,6 @@ int ufshcd_get_vreg(struct device *dev, struct ufs_vreg *vreg);
 
 int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd);
 
-int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
-			     struct utp_upiu_req *req_upiu,
-			     struct utp_upiu_req *rsp_upiu,
-			     int msgcode,
-			     u8 *desc_buff, int *buff_len,
-			     enum query_opcode desc_op);
 int ufshcd_advanced_rpmb_req_handler(struct ufs_hba *hba, struct utp_upiu_req *req_upiu,
 				     struct utp_upiu_req *rsp_upiu, struct ufs_ehs *ehs_req,
 				     struct ufs_ehs *ehs_rsp, int sg_cnt,