Merge branch 'linus' into x86/urgent

Merge reason: pull in latest, to be able to revert a patch there.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 7 deletions

diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index e20dc525d17..3a4fb023af7 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -768,17 +768,32 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
 		/* set the result so the higher layers expect this data */
 		srb->result = SAM_STAT_CHECK_CONDITION;
 
-		/* If things are really okay, then let's show that.  Zero
-		 * out the sense buffer so the higher layers won't realize
-		 * we did an unsolicited auto-sense. */
-		if (result == USB_STOR_TRANSPORT_GOOD &&
-			/* Filemark 0, ignore EOM, ILI 0, no sense */
+		/* We often get empty sense data.  This could indicate that
+		 * everything worked or that there was an unspecified
+		 * problem.  We have to decide which.
+		 */
+		if (	/* Filemark 0, ignore EOM, ILI 0, no sense */
 				(srb->sense_buffer[2] & 0xaf) == 0 &&
 			/* No ASC or ASCQ */
 				srb->sense_buffer[12] == 0 &&
 				srb->sense_buffer[13] == 0) {
-			srb->result = SAM_STAT_GOOD;
-			srb->sense_buffer[0] = 0x0;
+
+			/* If things are really okay, then let's show that.
+			 * Zero out the sense buffer so the higher layers
+			 * won't realize we did an unsolicited auto-sense.
+			 */
+			if (result == USB_STOR_TRANSPORT_GOOD) {
+				srb->result = SAM_STAT_GOOD;
+				srb->sense_buffer[0] = 0x0;
+
+			/* If there was a problem, report an unspecified
+			 * hardware error to prevent the higher layers from
+			 * entering an infinite retry loop.
+			 */
+			} else {
+				srb->result = DID_ERROR << 16;
+				srb->sense_buffer[2] = HARDWARE_ERROR;
+			}
 		}
 	}