linux-kernel - [PATCH 3.13 101/187] drivers: scsi: storvsc: Correctly handle TEST_UNIT

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Message-Id: <1410818997-9432-102-git-send-email-kamal@canonical.com>
Date:	Mon, 15 Sep 2014 15:08:31 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Christoph Hellwig <hch@....de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 101/187] drivers: scsi: storvsc: Correctly handle TEST_UNIT_READY failure

3.13.11.7 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: "K. Y. Srinivasan" <kys@...rosoft.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@...rosoft.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/scsi/storvsc_drv.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index b529ae8..ed0f899 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1018,6 +1018,13 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
 		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);
 		}
-- 
1.9.1

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