linux-kernel - [PATCH] scsi: storvsc: Fix scsi_cmd error assignments in storvsc_handle

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Date:   Tue, 19 Dec 2017 13:32:48 -0500
From:   Cathy Avery <cavery@...hat.com>
To:     kys@...rosoft.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     sthemmin@...rosoft.com, haiyangz@...rosoft.com,
        devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, longli@...rosoft.com
Subject: [PATCH] scsi: storvsc: Fix scsi_cmd error assignments in storvsc_handle_error

When an I/O is returned with an srb_status of SRB_STATUS_INVALID_LUN
which has zero good_bytes it must be assigned an error. Otherwise
the I/O will be continuously requeued and will cause a deadlock in the
case where disks are being hot added and removed. sd_probe_async will
wait forever for its I/O to complete while holding scsi_sd_probe_domain.

Also returning the default error of DID_TARGET_FAILURE causes
multipath to not retry the I/O resulting in applications receiving I/O
errors before a failover can occur.

Signed-off-by: Cathy Avery <cavery@...hat.com>
Signed-off-by: Long Li <longli@...rosoft.com>
---
 drivers/scsi/storvsc_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 1b06cf0..3b3d1d0 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -953,10 +953,11 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
 		case TEST_UNIT_READY:
 			break;
 		default:
-			set_host_byte(scmnd, DID_TARGET_FAILURE);
+			set_host_byte(scmnd, DID_ERROR);
 		}
 		break;
 	case SRB_STATUS_INVALID_LUN:
+		set_host_byte(scmnd, DID_NO_CONNECT);
 		do_work = true;
 		process_err_fn = storvsc_remove_lun;
 		break;
-- 
2.5.0