linux-kernel - [ 053/147] [SCSI] scsi_dh_alua: Enable STPG for unavailable ports

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Message-Id: <20121014143541.050528990@decadent.org.uk>
Date:	Sun, 14 Oct 2012 15:36:26 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Bart Van Assche <bvanassche@....org>,
	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <JBottomley@...allels.com>
Subject: [ 053/147] [SCSI] scsi_dh_alua: Enable STPG for unavailable ports

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bvanassche@....org>

commit e47f8976d8e573928824a06748f7bc82c58d747f upstream.

A quote from SPC-4: "While in the unavailable primary target port
asymmetric access state, the device server shall support those of
the following commands that it supports while in the active/optimized
state: [ ... ] d) SET TARGET PORT GROUPS; [ ... ]". Hence enable
sending STPG to a target port group that is in the unavailable state.

Signed-off-by: Bart Van Assche <bvanassche@....org>
Reviewed-by: Mike Christie <michaelc@...wisc.edu>
Acked-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/device_handler/scsi_dh_alua.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 08d80a6..6f4d8e6 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -641,8 +641,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
 		h->state = TPGS_STATE_STANDBY;
 		break;
 	case TPGS_STATE_OFFLINE:
-	case TPGS_STATE_UNAVAILABLE:
-		/* Path unusable for unavailable/offline */
+		/* Path unusable */
 		err = SCSI_DH_DEV_OFFLINED;
 		break;
 	default:


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