[PATCH v2 24/35] scsi: hp_sw: Have scsi-ml retry scsi_exec_req errors

[Mike Christie <michael.christie@oracle.com>]

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

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/device_handler/scsi_dh_hp_sw.c | 58 +++++++++++++--------
 1 file changed, 35 insertions(+), 23 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index adcbe3b883b7..c186809f2e17 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) {
 			/*
@@ -85,8 +82,17 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
 	int ret = SCSI_DH_OK, res;
 	blk_opf_t req_flags = 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,
+		},
+		{},
+	};
 
-retry:
 	res = scsi_exec_req(((struct scsi_exec_args) {
 				.sdev = sdev,
 				.cmd = cmd,
@@ -94,7 +100,8 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
 				.sshdr = &sshdr,
 				.timeout = HP_SW_TIMEOUT,
 				.retries = HP_SW_RETRIES,
-				.op_flags = req_flags }));
+				.op_flags = req_flags,
+				.failures = failures }));
 	if (res) {
 		if (scsi_sense_valid(&sshdr))
 			ret = tur_done(sdev, h, &sshdr);
@@ -108,8 +115,6 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
 		h->path_state = HP_SW_PATH_ACTIVE;
 		ret = SCSI_DH_OK;
 	}
-	if (ret == SCSI_DH_IMM_RETRY)
-		goto retry;
 
 	return ret;
 }
@@ -126,19 +131,33 @@ 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 = SCSI_DH_OK;
-	int retry_cnt = HP_SW_RETRIES;
 	blk_opf_t req_flags = 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,
+		},
+		{},
+	};
 
-retry:
 	res = scsi_exec_req(((struct scsi_exec_args) {
-				.sdev = sdev,
-				.cmd = cmd,
-				.data_dir = DMA_NONE,
-				.sshdr = &sshdr,
-				.timeout = HP_SW_TIMEOUT,
-				.retries = HP_SW_RETRIES,
-				.op_flags = req_flags }));
+					.sdev = sdev,
+					.cmd = cmd,
+					.data_dir = DMA_NONE,
+					.sshdr = &sshdr,
+					.timeout = HP_SW_TIMEOUT,
+					.retries = HP_SW_RETRIES,
+					.op_flags = req_flags,
+					.failures = failures }));
 	if (res) {
 		if (!scsi_sense_valid(&sshdr)) {
 			sdev_printk(KERN_WARNING, sdev,
@@ -149,13 +168,6 @@ 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;
 			}
-- 
2.25.1