[SCSI] scsi dh alua: handle report luns data changed in check sense callout

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@promise.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 31e1df5..dba154c 100644 (file)
--- 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;
        }