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From:   John Garry <john.garry@huawei.com>
To:     <jejb@linux.ibm.com>, <martin.petersen@oracle.com>,
        <artur.paszkiewicz@intel.com>, <jinpu.wang@cloud.ionos.com>,
        <chenxiang66@hisilicon.com>, <Ajish.Koshy@microchip.com>
CC:     <yanaijie@huawei.com>, <linux-doc@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-scsi@vger.kernel.org>,
        <linuxarm@huawei.com>, <liuqi115@huawei.com>,
        <Viswas.G@microchip.com>, <damien.lemoal@opensource.wdc.com>,
        John Garry <john.garry@huawei.com>
Subject: [PATCH 01/16] scsi: libsas: Use enum for response frame DATAPRES field
Date:   Tue, 25 Jan 2022 19:32:37 +0800
Message-ID: <1643110372-85470-2-git-send-email-john.garry@huawei.com>
In-Reply-To: <1643110372-85470-1-git-send-email-john.garry@huawei.com>
References: <1643110372-85470-1-git-send-email-john.garry@huawei.com>
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As defined in table 126 of the SAS spec 1.1, use an enum for the DATAPRES
field, which makes reading the code easier.

Signed-off-by: John Garry <john.garry@huawei.com>
---
 drivers/scsi/libsas/sas_task.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/libsas/sas_task.c b/drivers/scsi/libsas/sas_task.c
index 2966ead1d421..7240fd22b154 100644
--- a/drivers/scsi/libsas/sas_task.c
+++ b/drivers/scsi/libsas/sas_task.c
@@ -7,6 +7,12 @@
 #include <scsi/sas.h>
 #include <scsi/libsas.h>
 
+enum {
+	NO_DATA = 0,
+	RESPONSE_DATA = 1,
+	SENSE_DATA = 2,
+};
+
 /* fill task_status_struct based on SSP response frame */
 void sas_ssp_task_response(struct device *dev, struct sas_task *task,
 			   struct ssp_response_iu *iu)
@@ -15,11 +21,11 @@ void sas_ssp_task_response(struct device *dev, struct sas_task *task,
 
 	tstat->resp = SAS_TASK_COMPLETE;
 
-	if (iu->datapres == 0)
+	if (iu->datapres == NO_DATA)
 		tstat->stat = iu->status;
-	else if (iu->datapres == 1)
+	else if (iu->datapres == RESPONSE_DATA)
 		tstat->stat = iu->resp_data[3];
-	else if (iu->datapres == 2) {
+	else if (iu->datapres == SENSE_DATA) {
 		tstat->stat = SAS_SAM_STAT_CHECK_CONDITION;
 		tstat->buf_valid_size =
 			min_t(int, SAS_STATUS_BUF_SIZE,
-- 
2.26.2