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authorwenxiong@linux.vnet.ibm.com <wenxiong@linux.vnet.ibm.com>2014-11-06 15:11:23 -0600
committerChristoph Hellwig <hch@lst.de>2014-11-10 15:23:27 +0100
commit333b2448cf5bd5a94c91a77136cac837d38fb984 (patch)
treeb4618a159f3df6fb6adce0ec9aac7f08c45601cd
parente925cc431ac8285ad6e8b3fe09f6e3d8b3c30d56 (diff)
scsi: TUR path is down after adapter gets reset with multipath
This patch fixes an issue with multipath ipr SAS devices which require a start unit command to be issued following an adapter reset. Without this patch, paths get marked failed following an adapter reset and since the error handler never gets invoked to issue the start unit, the paths are never recovered. Returning FAILED for this case ensures the error handler wakes up to issue the start unit. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Tested-by: Wen Xiong <wenxiong@linux.vnet.ibm.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--drivers/scsi/device_handler/scsi_dh_alua.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index e99507ed0e3..fd78bdc5352 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -474,6 +474,13 @@ static int alua_check_sense(struct scsi_device *sdev,
* LUN Not Ready -- Offline
*/
return SUCCESS;
+ if (sdev->allow_restart &&
+ sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x02)
+ /*
+ * if the device is not started, we need to wake
+ * the error handler to start the motor
+ */
+ return FAILED;
break;
case UNIT_ATTENTION:
if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)