[SCSI] zfcp: make use of fc_remote_port_delete when target port is unavailable

If zfcp's port erp fails we now call fc_remote_port_delete. This helps
to avoid offlined scsi devices if scsi commands time out due to path
failures. When an adapter erp fails we call fc_remote_port_delete for
all ports on that adapter.

Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 27 insertions, 4 deletions

diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index 05c47f6ca924..4682c8b8bd24 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -3241,9 +3241,13 @@ zfcp_erp_action_cleanup(int action, struct zfcp_adapter *adapter,
                 break;
         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
         case ZFCP_ERP_ACTION_REOPEN_PORT:
+                if (atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN,
+                                     &port->status)) {
+                        zfcp_port_put(port);
+                        break;
+                }
+
                 if ((result == ZFCP_ERP_SUCCEEDED)
-                    && !atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN,
-                                         &port->status)
                     && !port->rport) {
                         struct fc_rport_identifiers ids;
                         ids.node_name = port->wwnn;
@@ -3264,9 +3268,23 @@ zfcp_erp_action_cleanup(int action, struct zfcp_adapter *adapter,
                                         port->supported_classes;
                         }
                 }
+                if ((result != ZFCP_ERP_SUCCEEDED) && port->rport) {
+                        fc_remote_port_delete(port->rport);
+                        port->rport = NULL;
+                }
                 zfcp_port_put(port);
                 break;
         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+                if (result != ZFCP_ERP_SUCCEEDED) {
+                        struct zfcp_port *port;
+                        list_for_each_entry(port, &adapter->port_list_head, list)
+                                if (port->rport &&
+                                    !atomic_test_mask(ZFCP_STATUS_PORT_WKA,
+                                                      &port->status)) {
+                                        fc_remote_port_delete(port->rport);
+                                        port->rport = NULL;
+                                }
+                }
                 zfcp_adapter_put(adapter);
                 break;
         default:
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index ab38b8ce27aa..d02366004cdd 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -132,8 +132,6 @@ extern int zfcp_scsi_command_async(struct zfcp_adapter *,struct zfcp_unit *,
                                    struct scsi_cmnd *, struct timer_list *);
 extern int zfcp_scsi_command_sync(struct zfcp_unit *, struct scsi_cmnd *,
                                   struct timer_list *);
-extern void zfcp_set_fc_host_attrs(struct zfcp_adapter *);
-extern void zfcp_set_fc_rport_attrs(struct zfcp_port *);
 extern struct scsi_transport_template *zfcp_transport_template;
 extern struct fc_function_template zfcp_transport_functions;
 
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index 30e87197f5f8..46e14f22ec18 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -800,12 +800,18 @@ zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
         }
 }
 
+static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
+{
+        rport->dev_loss_tmo = timeout;
+}
+
 struct fc_function_template zfcp_transport_functions = {
         .show_starget_port_id = 1,
         .show_starget_port_name = 1,
         .show_starget_node_name = 1,
         .show_rport_supported_classes = 1,
         .show_rport_maxframe_size = 1,
+        .show_rport_dev_loss_tmo = 1,
         .show_host_node_name = 1,
         .show_host_port_name = 1,
         .show_host_permanent_port_name = 1,
@@ -815,6 +821,7 @@ struct fc_function_template zfcp_transport_functions = {
         .show_host_serial_number = 1,
         .get_fc_host_stats = zfcp_get_fc_host_stats,
         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
+        .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
         /* no functions registered for following dynamic attributes but
            directly set by LLDD */
         .show_host_port_type = 1,