linux-kernel - [PATCH 002/145] [SCSI] zfcp: fix adapter (re)open recovery while link to SAN is down

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Message-Id: <1374101277-7915-3-git-send-email-kamal@canonical.com>
Date:	Wed, 17 Jul 2013 15:45:34 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Daniel Hansel <daniel.hansel@...ux.vnet.ibm.com>,
	Steffen Maier <maier@...ux.vnet.ibm.com>,
	James Bottomley <JBottomley@...allels.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 002/145] [SCSI] zfcp: fix adapter (re)open recovery while link to SAN is down

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

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

From: Daniel Hansel <daniel.hansel@...ux.vnet.ibm.com>

commit f76ccaac4f82c463a037aa4a1e4ccb85c7011814 upstream.

FCP device remains in status ERP_FAILED when device is switched online
or adapter recovery is triggered  while link to SAN is down.

When Exchange Configuration Data command returns the FSF status
FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE it aborts the exchange process.
The only retries are done during the common error recovery procedure
(i.e. max. 3 retries with 8sec sleep between) and remains in status
ERP_FAILED with QDIO down.

This commit reverts the commit 0df138476c8306478d6e726f044868b4bccf411c
(zfcp: Fix adapter activation on link down).
When FSF status FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE is received the
adapter recovery will be finished without any retries. QDIO will be
up now and status changes such as LINK UP will be received now.

Signed-off-by: Daniel Hansel <daniel.hansel@...ux.vnet.ibm.com>
Signed-off-by: Steffen Maier <maier@...ux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/s390/scsi/zfcp_fsf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index c96320d..ccff8b2 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -563,6 +563,10 @@ static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 		fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 		adapter->hydra_version = 0;

+		/* avoids adapter shutdown to be able to recognize
+		 * events such as LINK UP */
+		atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
+				&adapter->status);
 		zfcp_fsf_link_down_info_eval(req,
 			&qtcb->header.fsf_status_qual.link_down_info);
 		break;
-- 
1.8.1.2

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