This is a note to let you know that I've just added the patch titled
scsi_dh_rdac: always retry MODE SELECT on command lock violation
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi_dh_rdac-always-retry-mode-select-on-command-lock-violation.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d2d06d4fe0f2cc2df9b17fefec96e6e1a1271d91 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@xxxxxxx>
Date: Fri, 22 Jan 2016 15:42:41 +0100
Subject: scsi_dh_rdac: always retry MODE SELECT on command lock violation
From: Hannes Reinecke <hare@xxxxxxx>
commit d2d06d4fe0f2cc2df9b17fefec96e6e1a1271d91 upstream.
If MODE SELECT returns with sense '05/91/36' (command lock violation)
it should always be retried without counting the number of retries.
During an HBA upgrade or similar circumstances one might see a flood
of MODE SELECT command from various HBAs, which will easily trigger
the sense code and exceed the retry count.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_rdac.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -562,7 +562,7 @@ static int mode_select_handle_sense(stru
/*
* Command Lock contention
*/
- err = SCSI_DH_RETRY;
+ err = SCSI_DH_IMM_RETRY;
break;
default:
break;
@@ -612,6 +612,8 @@ retry:
err = mode_select_handle_sense(sdev, h->sense);
if (err == SCSI_DH_RETRY && retry_cnt--)
goto retry;
+ if (err == SCSI_DH_IMM_RETRY)
+ goto retry;
}
if (err == SCSI_DH_OK) {
h->state = RDAC_STATE_ACTIVE;
Patches currently in stable-queue which might be from hare@xxxxxxx are
queue-4.4/modules-fix-modparam-async_probe-request.patch
queue-4.4/scsi_dh_rdac-always-retry-mode-select-on-command-lock-violation.patch
queue-4.4/iscsi-target-fix-potential-dead-lock-during-node-acl-delete.patch
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