[PATCH 1/1] Drivers: scsi: storvsc: Properly handle errors from the host

["K. Y. Srinivasan" <kys@microsoft.com>]

If the host returns error for pass through commands, deal with
appropriately. I would like to thank James for patiently helping
me with this patch.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/scsi/storvsc_drv.c |   20 ++++++++++++++++----
 1 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 83a1972..5053769 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -785,12 +785,24 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
 	/*
 	 * If there is an error; offline the device since all
 	 * error recovery strategies would have already been
-	 * deployed on the host side.
+	 * deployed on the host side. However, if the command
+	 * were a pass-through command deal with it appropriately.
 	 */
-	if (vm_srb->srb_status == SRB_STATUS_ERROR)
-		scmnd->result = DID_TARGET_FAILURE << 16;
-	else
+	switch (vm_srb->srb_status) {
+	case SRB_STATUS_ERROR:
+		switch (scmnd->cmnd[0]) {
+		case ATA_16:
+		case ATA_12:
+			scmnd->result = DID_PASSTHROUGH << 16;
+			break;
+		default:
+			scmnd->result = DID_TARGET_FAILURE << 16;
+		}
+		break;
+	default:
 		scmnd->result = vm_srb->scsi_status;
+	}
+
 
 	/*
 	 * If the LUN is invalid; remove the device.
-- 
1.7.4.1