[PATCH v11 12/34] scsi: hp_sw: Have scsi-ml retry scsi_exec_req errors

[Mike Christie <michael.christie@xxxxxxxxxx>]

This has hp_sw have scsi-ml retry scsi_exec_req errors instead of driving
them itself.

Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx>
---
 drivers/scsi/device_handler/scsi_dh_hp_sw.c | 43 +++++++++++++--------
 1 file changed, 27 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index 944ea4e0cc45..d31db178875c 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -46,9 +46,6 @@ static int tur_done(struct scsi_device *sdev, struct hp_sw_dh_data *h,
 	int ret = SCSI_DH_IO;
 
 	switch (sshdr->sense_key) {
-	case UNIT_ATTENTION:
-		ret = SCSI_DH_IMM_RETRY;
-		break;
 	case NOT_READY:
 		if (sshdr->asc == 0x04 && sshdr->ascq == 2) {
 			/*
@@ -85,11 +82,21 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
 	int ret, res;
 	blk_opf_t opf = REQ_OP_DRV_IN | REQ_FAILFAST_DEV |
 				REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
+	struct scsi_failure failures[] = {
+		{
+			.sense = UNIT_ATTENTION,
+			.asc = SCMD_FAILURE_ASC_ANY,
+			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.allowed = SCMD_FAILURE_NO_LIMIT,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{}
+	};
 	const struct scsi_exec_args exec_args = {
 		.sshdr = &sshdr,
+		.failures = failures,
 	};
 
-retry:
 	res = scsi_execute_cmd(sdev, cmd, opf, NULL, 0, HP_SW_TIMEOUT,
 			       HP_SW_RETRIES, &exec_args);
 	if (res > 0 && scsi_sense_valid(&sshdr)) {
@@ -104,9 +111,6 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
 		ret = SCSI_DH_IO;
 	}
 
-	if (ret == SCSI_DH_IMM_RETRY)
-		goto retry;
-
 	return ret;
 }
 
@@ -122,14 +126,28 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *h)
 	struct scsi_sense_hdr sshdr;
 	struct scsi_device *sdev = h->sdev;
 	int res, rc;
-	int retry_cnt = HP_SW_RETRIES;
 	blk_opf_t opf = REQ_OP_DRV_IN | REQ_FAILFAST_DEV |
 				REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
+	struct scsi_failure failures[] = {
+		{
+			/*
+			 * LUN not ready - manual intervention required
+			 *
+			 * Switch-over in progress, retry.
+			 */
+			.sense = NOT_READY,
+			.asc = 0x04,
+			.ascq = 0x03,
+			.allowed = HP_SW_RETRIES,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{}
+	};
 	const struct scsi_exec_args exec_args = {
 		.sshdr = &sshdr,
+		.failures = failures,
 	};
 
-retry:
 	res = scsi_execute_cmd(sdev, cmd, opf, NULL, 0, HP_SW_TIMEOUT,
 			       HP_SW_RETRIES, &exec_args);
 	if (!res) {
@@ -144,13 +162,6 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *h)
 	switch (sshdr.sense_key) {
 	case NOT_READY:
 		if (sshdr.asc == 0x04 && sshdr.ascq == 3) {
-			/*
-			 * LUN not ready - manual intervention required
-			 *
-			 * Switch-over in progress, retry.
-			 */
-			if (--retry_cnt)
-				goto retry;
 			rc = SCSI_DH_RETRY;
 			break;
 		}
-- 
2.34.1