4.9-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 3.16.3 / drivers-scsi-storvsc-correctly-handle-test_unit_ready-failure.patch

From 3533f8603d28b77c62d75ec899449a99bc6b77a1 Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@microsoft.com>
Date: Sat, 12 Jul 2014 09:48:32 -0700
Subject: drivers: scsi: storvsc: Correctly handle TEST_UNIT_READY failure

From: "K. Y. Srinivasan" <kys@microsoft.com>

commit 3533f8603d28b77c62d75ec899449a99bc6b77a1 upstream.

On some Windows hosts on FC SANs, TEST_UNIT_READY can return SRB_STATUS_ERROR.
Correctly handle this. Note that there is sufficient sense information to
support scsi error handling even in this case.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/scsi/storvsc_drv.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1018,6 +1018,13 @@ static void storvsc_handle_error(struct
 		case ATA_12:
 			set_host_byte(scmnd, DID_PASSTHROUGH);
 			break;
+		/*
+		 * On Some Windows hosts TEST_UNIT_READY command can return
+		 * SRB_STATUS_ERROR, let the upper level code deal with it
+		 * based on the sense information.
+		 */
+		case TEST_UNIT_READY:
+			break;
 		default:
 			set_host_byte(scmnd, DID_TARGET_FAILURE);
 		}