[SCSI] sd: Don't try to spin up drives that are connected to an inact…

…ive port

We currently try to spin up drives connected to standby and unavailable
ports.  This will never succeed and wastes a lot of time.  Fail quickly
if the sense data reports the port is in standby or unavailable state.

Reported-by: Narayanan Rengarajan <narayanan.rengarajan@hp.com>
Tested-by: Narayanan Rengarajan <narayanan.rengarajan@hp.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/sd.c

@@ -1167,23 +1167,19 @@ sd_spinup_disk(struct scsi_disk *sdkp)
 		/*
 		 * The device does not want the automatic start to be issued.
 		 */
-		if (sdkp->device->no_start_on_add) {
+		if (sdkp->device->no_start_on_add)
 			break;
-		}
-
-		/*
-		 * If manual intervention is required, or this is an
-		 * absent USB storage device, a spinup is meaningless.
-		 */
-		if (sense_valid &&
-		    sshdr.sense_key == NOT_READY &&
-		    sshdr.asc == 4 && sshdr.ascq == 3) {
-			break;		/* manual intervention required */
 
-		/*
-		 * Issue command to spin up drive when not ready
-		 */
-		} else if (sense_valid && sshdr.sense_key == NOT_READY) {
+		if (sense_valid && sshdr.sense_key == NOT_READY) {
+			if (sshdr.asc == 4 && sshdr.ascq == 3)
+				break;	/* manual intervention required */
+			if (sshdr.asc == 4 && sshdr.ascq == 0xb)
+				break;	/* standby */
+			if (sshdr.asc == 4 && sshdr.ascq == 0xc)
+				break;	/* unavailable */
+			/*
+			 * Issue command to spin up drive when not ready
+			 */
 			if (!spintime) {
 				sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
 				cmd[0] = START_STOP;