scsi: libsas: Use enum for response frame DATAPRES field

As defined in table 126 of the SAS spec 1.1, use an enum for the DATAPRES
field, which makes reading the code easier.

Also change sas_ssp_task_response() to use a switch statement, which is
more suitable (than if-else), as suggested by Christoph.

Link: https://lore.kernel.org/r/1645112566-115804-3-git-send-email-john.garry@huawei.com
Suggested-by: Xiang Chen <chenxiang66@hisilicon.com>
Tested-by: Yihang Li <liyihang6@hisilicon.com>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

5 files changed, 22 insertions, 10 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_tmf.c b/drivers/scsi/aic94xx/aic94xx_tmf.c
index 0eb6e206a2b4..2ba91eaaf0ee 100644
--- a/drivers/scsi/aic94xx/aic94xx_tmf.c
+++ b/drivers/scsi/aic94xx/aic94xx_tmf.c
@@ -287,7 +287,7 @@ static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
 	fh = edb->vaddr + 16;
 	ru = edb->vaddr + 16 + sizeof(*fh);
 	res = ru->status;
-	if (ru->datapres == 1)	  /* Response data present */
+	if (ru->datapres == SAS_DATAPRES_RESPONSE_DATA)
 		res = ru->resp_data[3];
 #if 0
 	ascb->tag = fh->tag;
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 92394884fbeb..ac17e3a35d2c 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -1047,7 +1047,8 @@ request_started_state_tc_event(struct isci_request *ireq,
 		resp_iu = &ireq->ssp.rsp;
 		datapres = resp_iu->datapres;
 
-		if (datapres == 1 || datapres == 2) {
+		if (datapres == SAS_DATAPRES_RESPONSE_DATA ||
+		    datapres == SAS_DATAPRES_SENSE_DATA) {
 			ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
 			ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
 		} else {
@@ -1730,8 +1731,8 @@ sci_io_request_frame_handler(struct isci_request *ireq,
 
 			resp_iu = &ireq->ssp.rsp;
 
-			if (resp_iu->datapres == 0x01 ||
-			    resp_iu->datapres == 0x02) {
+			if (resp_iu->datapres == SAS_DATAPRES_RESPONSE_DATA ||
+			    resp_iu->datapres == SAS_DATAPRES_SENSE_DATA) {
 				ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
 				ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
 			} else {
diff --git a/drivers/scsi/libsas/sas_task.c b/drivers/scsi/libsas/sas_task.c
index 2966ead1d421..e9d291007817 100644
--- a/drivers/scsi/libsas/sas_task.c
+++ b/drivers/scsi/libsas/sas_task.c
@@ -15,11 +15,14 @@ void sas_ssp_task_response(struct device *dev, struct sas_task *task,
 
 	tstat->resp = SAS_TASK_COMPLETE;
 
-	if (iu->datapres == 0)
+	switch (iu->datapres) {
+	case SAS_DATAPRES_NO_DATA:
 		tstat->stat = iu->status;
-	else if (iu->datapres == 1)
+		break;
+	case SAS_DATAPRES_RESPONSE_DATA:
 		tstat->stat = iu->resp_data[3];
-	else if (iu->datapres == 2) {
+		break;
+	case SAS_DATAPRES_SENSE_DATA:
 		tstat->stat = SAS_SAM_STAT_CHECK_CONDITION;
 		tstat->buf_valid_size =
 			min_t(int, SAS_STATUS_BUF_SIZE,
@@ -29,10 +32,11 @@ void sas_ssp_task_response(struct device *dev, struct sas_task *task,
 		if (iu->status != SAM_STAT_CHECK_CONDITION)
 			dev_warn(dev, "dev %016llx sent sense data, but stat(0x%x) is not CHECK CONDITION\n",
 				 SAS_ADDR(task->dev->sas_addr), iu->status);
-	}
-	else
+		break;
+	default:
 		/* when datapres contains corrupt/unknown value... */
 		tstat->stat = SAS_SAM_STAT_CHECK_CONDITION;
+	}
 }
 EXPORT_SYMBOL_GPL(sas_ssp_task_response);
 
diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index a8d1f3dd607a..b48ae26e29a9 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -1638,7 +1638,7 @@ static void mvs_set_sense(u8 *buffer, int len, int d_sense,
 static void mvs_fill_ssp_resp_iu(struct ssp_response_iu *iu,
 				u8 key, u8 asc, u8 asc_q)
 {
-	iu->datapres = 2;
+	iu->datapres = SAS_DATAPRES_SENSE_DATA;
 	iu->response_data_len = 0;
 	iu->sense_data_len = 17;
 	iu->status = 02;
diff --git a/include/scsi/sas.h b/include/scsi/sas.h
index 64154c1fed02..332a463d08ef 100644
--- a/include/scsi/sas.h
+++ b/include/scsi/sas.h
@@ -191,6 +191,13 @@ enum sas_gpio_reg_type {
 	SAS_GPIO_REG_TX_GP = 4,
 };
 
+/* Response frame DATAPRES field */
+enum {
+	SAS_DATAPRES_NO_DATA		= 0,
+	SAS_DATAPRES_RESPONSE_DATA	= 1,
+	SAS_DATAPRES_SENSE_DATA		= 2,
+};
+
 struct  dev_to_host_fis {
 	u8     fis_type;	  /* 0x34 */
 	u8     flags;