Re: [PATCH 3/3] scsi dh alua: handle report luns data changed in check sense callout

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Hi Mike,

michaelc@xxxxxxxxxxx wrote:
From: Ilgu Hong <ilgu.hong@xxxxxxxxxxx>

When we switch controllers the Intel Multi-Flex reports
REPORTED_LUNS_DATA_HAS_CHANGED. This patch just has us
retry the command.

Signed-off-by: Ilgu Hong <ilgu.hong@xxxxxxxxxxx>
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
 drivers/scsi/device_handler/scsi_dh_alua.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 31e1df5..dba154c 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -461,6 +461,15 @@ static int alua_check_sense(struct scsi_device *sdev,
 			 */
 			return ADD_TO_MLQUEUE;
 		}
+		if (sense_hdr->asc == 0x3f && sense_hdr->ascq == 0x0e) {
+			/*
+			 * REPORTED_LUNS_DATA_HAS_CHANGED is reported
+			 * when switching controllers on targets like
+			 * Intel Multi-Flex. We can just retry.
+			 */
+			return ADD_TO_MLQUEUE;
+		}
+
 		break;
 	}
Hmm. We could as well always retry for Unit Attention; it's meant to be
a temporary condition anyway so no harm in retrying.

Cheers,

Hannes
--
Dr. Hannes Reinecke		      zSeries & Storage
hare@xxxxxxx			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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