From: Benjamin Block <bblock@linux.ibm.com>
Date: Fri, 8 May 2020 19:23:30 +0200
Subject: scsi: zfcp: Move fc_host updates during xport data handling into
 fenced function
Patch-mainline: v5.8-rc1
Git-commit: 52e61fde5ec95cb4011784fb0bc6b436e16fcaa8
References: bsc#1158050

When executing exchange port data for a FCP device for the first time, or
after an adapter recovery, we update several properties of the fibre
channel host object which represents that FCP device.

When moving the scsi host object allocation and registration - and thus
also the fibre channel host object allocation - to after the first exchange
config and exchange port data, this is not possible for the former case.

Move all these update into separate, and fenced function that first checks
whether the scsi host object already exists or not, before making the
updates.

During the first ever exchange port data in the adapter life cycle this
will make the exchange port data handler skip over this update step, but we
can repeat it later, after we allocated the scsi host object.

For any further recovery of that adapter the work flow is only changed
slightly because then the scsi host object already exists and we don't free
it until we release the adapter completely at the end of its life cycle.

Link: https://lore.kernel.org/r/ae454c2dc6da0b02907c489af91d0b211d331825.1588956679.git.bblock@linux.ibm.com
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Martin Wilck <mwilck@suse.com>
---
 drivers/s390/scsi/zfcp_ext.h  |    3 +++
 drivers/s390/scsi/zfcp_fsf.c  |   12 +++---------
 drivers/s390/scsi/zfcp_scsi.c |   19 +++++++++++++++++++
 3 files changed, 25 insertions(+), 9 deletions(-)

--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -176,6 +176,9 @@ extern void zfcp_scsi_shost_update_confi
 	struct zfcp_adapter *const adapter,
 	const struct fsf_qtcb_bottom_config *const bottom,
 	const bool bottom_incomplete);
+extern void zfcp_scsi_shost_update_port_data(
+	struct zfcp_adapter *const adapter,
+	const struct fsf_qtcb_bottom_port *const bottom);
 
 /* zfcp_sysfs.c */
 extern const struct attribute_group *zfcp_unit_attr_groups[];
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -726,19 +726,10 @@ static void zfcp_fsf_exchange_port_evalu
 {
 	struct zfcp_adapter *adapter = req->adapter;
 	struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
-	struct Scsi_Host *shost = adapter->scsi_host;
 
 	if (req->data)
 		memcpy(req->data, bottom, sizeof(*bottom));
 
-	fc_host_permanent_port_name(shost) = bottom->wwpn;
-	fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
-	fc_host_supported_speeds(shost) =
-		zfcp_fsf_convert_portspeed(bottom->supported_speed);
-	memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types,
-	       FC_FC4_LIST_SIZE);
-	memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types,
-	       FC_FC4_LIST_SIZE);
 	if (adapter->adapter_features & FSF_FEATURE_FC_SECURITY)
 		adapter->fc_security_algorithms =
 			bottom->fc_security_algorithms;
@@ -765,6 +756,7 @@ static void zfcp_fsf_exchange_port_data_
 		 */
 		zfcp_diag_update_xdata(diag_hdr, bottom, false);
 
+		zfcp_scsi_shost_update_port_data(req->adapter, bottom);
 		zfcp_fsf_exchange_port_evaluate(req);
 		break;
 	case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
@@ -773,6 +765,8 @@ static void zfcp_fsf_exchange_port_data_
 
 		zfcp_fsf_link_down_info_eval(req,
 			&qtcb->header.fsf_status_qual.link_down_info);
+
+		zfcp_scsi_shost_update_port_data(req->adapter, bottom);
 		zfcp_fsf_exchange_port_evaluate(req);
 		break;
 	}
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -911,6 +911,25 @@ void zfcp_scsi_shost_update_config_data(
 	}
 }
 
+void zfcp_scsi_shost_update_port_data(
+	struct zfcp_adapter *const adapter,
+	const struct fsf_qtcb_bottom_port *const bottom)
+{
+	struct Scsi_Host *const shost = adapter->scsi_host;
+
+	if (shost == NULL)
+		return;
+
+	fc_host_permanent_port_name(shost) = bottom->wwpn;
+	fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
+	fc_host_supported_speeds(shost) =
+		zfcp_fsf_convert_portspeed(bottom->supported_speed);
+	memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types,
+	       FC_FC4_LIST_SIZE);
+	memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types,
+	       FC_FC4_LIST_SIZE);
+}
+
 struct fc_function_template zfcp_transport_functions = {
 	.show_starget_port_id = 1,
 	.show_starget_port_name = 1,