[PATCH 4/4] scsi: return BLK_STS_AGAIN for ALUA transitioning

[Hannes Reinecke <hare@suse.de>]

Whenever we encounter a sense code of ALUA transitioning in
scsi_io_completion() it means that the SCSI midlayer ran out
of retries trying to wait for ALUA transitioning.
In these cases we should be passing up the error, but signalling
that the I/O might be retried, preferably on another path.
So return BLK_STS_AGAIN in these cases.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/scsi_lib.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b628aa0d824c..e6221d65fa8e 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -764,6 +764,9 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result)
 				case 0x24: /* depopulation in progress */
 					action = ACTION_DELAYED_RETRY;
 					break;
+				case 0x0a: /* ALUA state transistion */
+					blk_stat = BLK_STS_AGAIN;
+					/* fall through */
 				default:
 					action = ACTION_FAIL;
 					break;
-- 
2.16.4