[PATCH RFC 06/22] scsi: Have scsi-ml retry read_capacity_16 errors

[Mike Christie <michael.christie@xxxxxxxxxx>]

This has read_capacity_16 have scsi-ml retry errors instead of driving
them itself.

Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
---
 drivers/scsi/sd.c | 70 ++++++++++++++++++++++++-----------------------
 1 file changed, 36 insertions(+), 34 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index c215da95fb8f..46383b680893 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2259,50 +2259,52 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
 	struct scsi_sense_hdr sshdr;
 	int sense_valid = 0;
 	int the_result;
-	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
 	unsigned int alignment;
 	unsigned long long lba;
 	unsigned sector_size;
+	struct scsi_failure failures[] = {
+		{
+			.sense = UNIT_ATTENTION,
+			.asc = 0x29,
+			.ascq = 0,
+			/* Device reset might occur several times */
+			.allowed = READ_CAPACITY_RETRIES_ON_RESET,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.result = SCMD_FAILURE_ANY,
+			.allowed = 3,
+		},
+		{},
+	};
 
 	if (sdp->no_read_capacity_16)
 		return -EINVAL;
 
-	do {
-		memset(cmd, 0, 16);
-		cmd[0] = SERVICE_ACTION_IN_16;
-		cmd[1] = SAI_READ_CAPACITY_16;
-		cmd[13] = RC16_LEN;
-		memset(buffer, 0, RC16_LEN);
-
-		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
-					buffer, RC16_LEN, &sshdr,
-					SD_TIMEOUT, sdkp->max_retries, NULL,
-					NULL);
+	memset(cmd, 0, 16);
+	cmd[0] = SERVICE_ACTION_IN_16;
+	cmd[1] = SAI_READ_CAPACITY_16;
+	cmd[13] = RC16_LEN;
+	memset(buffer, 0, RC16_LEN);
 
-		if (media_not_present(sdkp, &sshdr))
-			return -ENODEV;
+	the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, buffer,
+				      RC16_LEN, &sshdr, SD_TIMEOUT,
+				      sdkp->max_retries, NULL, failures);
 
-		if (the_result > 0) {
-			sense_valid = scsi_sense_valid(&sshdr);
-			if (sense_valid &&
-			    sshdr.sense_key == ILLEGAL_REQUEST &&
-			    (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
-			    sshdr.ascq == 0x00)
-				/* Invalid Command Operation Code or
-				 * Invalid Field in CDB, just retry
-				 * silently with RC10 */
-				return -EINVAL;
-			if (sense_valid &&
-			    sshdr.sense_key == UNIT_ATTENTION &&
-			    sshdr.asc == 0x29 && sshdr.ascq == 0x00)
-				/* Device reset might occur several times,
-				 * give it one more chance */
-				if (--reset_retries > 0)
-					continue;
-		}
-		retries--;
+	if (media_not_present(sdkp, &sshdr))
+		return -ENODEV;
 
-	} while (the_result && retries);
+	if (the_result > 0) {
+		sense_valid = scsi_sense_valid(&sshdr);
+		if (sense_valid && sshdr.sense_key == ILLEGAL_REQUEST &&
+		    (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
+		    sshdr.ascq == 0x00)
+			/*
+			 * Invalid Command Operation Code or Invalid Field in
+			 * CDB, just retry silently with RC10
+			 */
+			return -EINVAL;
+	}
 
 	if (the_result) {
 		sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
-- 
2.25.1