[PATCH v5 23/35] scsi: Have scsi-ml retry sd_spinup_disk errors

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

This simplifies sd_spinup_disk so scsi-ml retries errors for it. Note that
we retried specifically on a UA and also if scsi_status_is_good returned
failed which would happen for all check conditions. In this patch we use
SCMD_FAILURE_STAT_ANY which will trigger for the same conditions as
when scsi_status_is_good returns false. This will cover all CCs including
UAs so there is no explicit failures arrary entry for UAs.

We do not handle the outside loop's retries because we want to sleep
between tried and we don't support that yet.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org> 
---
 drivers/scsi/sd.c | 93 +++++++++++++++++++++++++++--------------------
 1 file changed, 53 insertions(+), 40 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index c94c3cdffa90..700b41c856c9 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2062,52 +2062,66 @@ static int sd_done(struct scsi_cmnd *SCpnt)
 static void
 sd_spinup_disk(struct scsi_disk *sdkp)
 {
-	unsigned char cmd[10];
+	static const u8 cmd[10] = { TEST_UNIT_READY };
 	unsigned long spintime_expire = 0;
-	int retries, spintime;
+	int spintime;
 	unsigned int the_result;
 	struct scsi_sense_hdr sshdr;
-	int sense_valid = 0;
+	int sense_valid = 0, i;
+	struct scsi_failure failures[] = {
+		/* Fail immediately for Medium Not Present */
+		{
+			.sense = UNIT_ATTENTION,
+			.asc = 0x3A,
+			.ascq = 0x0,
+			.allowed = 0,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.sense = NOT_READY,
+			.asc = 0x3A,
+			.ascq = 0x0,
+			.allowed = 0,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.result = SCMD_FAILURE_STAT_ANY,
+			.allowed = 3,
+		},
+		{},
+	};
 
 	spintime = 0;
 
 	/* Spin up drives, as required.  Only do this at boot time */
 	/* Spinup needs to be done for module loads too. */
 	do {
-		retries = 0;
-
-		do {
-			bool media_was_present = sdkp->media_present;
+		bool media_was_present = sdkp->media_present;
 
-			cmd[0] = TEST_UNIT_READY;
-			memset((void *) &cmd[1], 0, 9);
+		for (i = 0; i < ARRAY_SIZE(failures); i++)
+			failures[i].retries = 0;
 
-			the_result = scsi_exec_req(((struct scsi_exec_args) {
-							.sdev = sdkp->device,
-							.cmd = cmd,
-							.data_dir = DMA_NONE,
-							.sshdr = &sshdr,
-							.timeout = SD_TIMEOUT,
-							.retries = sdkp->max_retries }));
+		the_result = scsi_exec_req(((struct scsi_exec_args) {
+						.sdev = sdkp->device,
+						.cmd = cmd,
+						.data_dir = DMA_NONE,
+						.sshdr = &sshdr,
+						.timeout = SD_TIMEOUT,
+						.retries = sdkp->max_retries,
+						.failures = failures }));
 
-			/*
-			 * If the drive has indicated to us that it
-			 * doesn't have any media in it, don't bother
-			 * with any more polling.
-			 */
-			if (media_not_present(sdkp, &sshdr)) {
-				if (media_was_present)
-					sd_printk(KERN_NOTICE, sdkp, "Media removed, stopped polling\n");
-				return;
-			}
+		/*
+		 * If the drive has indicated to us that it doesn't have any
+		 * media in it, don't bother  with any more polling.
+		 */
+		if (media_not_present(sdkp, &sshdr)) {
+			if (media_was_present)
+				sd_printk(KERN_NOTICE, sdkp, "Media removed, stopped polling\n");
+			return;
+		}
 
-			if (the_result)
-				sense_valid = scsi_sense_valid(&sshdr);
-			retries++;
-		} while (retries < 3 &&
-			 (!scsi_status_is_good(the_result) ||
-			  (scsi_status_is_check_condition(the_result) &&
-			  sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
+		if (the_result)
+			sense_valid = scsi_sense_valid(&sshdr);
 
 		if (!scsi_status_is_check_condition(the_result)) {
 			/* no sense, TUR either succeeded or failed
@@ -2138,16 +2152,15 @@ sd_spinup_disk(struct scsi_disk *sdkp)
 			 * Issue command to spin up drive when not ready
 			 */
 			if (!spintime) {
+				/* Return immediately and start spin cycle */
+				const u8 start_cmd[10] = { START_STOP, 1, 0, 0,
+					sdkp->device->start_stop_pwr_cond ?
+					0x11 : 1 };
+
 				sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
-				cmd[0] = START_STOP;
-				cmd[1] = 1;	/* Return immediately */
-				memset((void *) &cmd[2], 0, 8);
-				cmd[4] = 1;	/* Start spin cycle */
-				if (sdkp->device->start_stop_pwr_cond)
-					cmd[4] |= 1 << 4;
 				scsi_exec_req(((struct scsi_exec_args) {
 						.sdev = sdkp->device,
-						.cmd = cmd,
+						.cmd = start_cmd,
 						.data_dir = DMA_NONE,
 						.sshdr = &sshdr,
 						.timeout = SD_TIMEOUT,
-- 
2.25.1