+/**
+ * zfcp_erp_try_rport_unblock - unblock rport if no more/new recovery
+ * @port: zfcp_port whose fc_rport we should try to unblock
+ */
+static void zfcp_erp_try_rport_unblock(struct zfcp_port *port)
+{
+ unsigned long flags;
+ struct zfcp_adapter *adapter = port->adapter;
+ int port_status;
+ struct Scsi_Host *shost = adapter->scsi_host;
+ struct scsi_device *sdev;
+
+ write_lock_irqsave(&adapter->erp_lock, flags);
+ port_status = atomic_read(&port->status);
+ if ((port_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 ||
+ (port_status & (ZFCP_STATUS_COMMON_ERP_INUSE |
+ ZFCP_STATUS_COMMON_ERP_FAILED)) != 0) {
+ /* new ERP of severity >= port triggered elsewhere meanwhile or
+ * local link down (adapter erp_failed but not clear unblock)
+ */
+ zfcp_dbf_rec_run_lvl(4, "ertru_p", &port->erp_action);
+ write_unlock_irqrestore(&adapter->erp_lock, flags);
+ return;
+ }
+ spin_lock(shost->host_lock);
+ __shost_for_each_device(sdev, shost) {
+ struct zfcp_scsi_dev *zsdev = sdev_to_zfcp(sdev);
+ int lun_status;
+
+ if (zsdev->port != port)
+ continue;
+ /* LUN under port of interest */
+ lun_status = atomic_read(&zsdev->status);
+ if ((lun_status & ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
+ continue; /* unblock rport despite failed LUNs */
+ /* LUN recovery not given up yet [maybe follow-up pending] */
+ if ((lun_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 ||
+ (lun_status & ZFCP_STATUS_COMMON_ERP_INUSE) != 0) {
+ /* LUN blocked:
+ * not yet unblocked [LUN recovery pending]
+ * or meanwhile blocked [new LUN recovery triggered]
+ */
+ zfcp_dbf_rec_run_lvl(4, "ertru_l", &zsdev->erp_action);
+ spin_unlock(shost->host_lock);
+ write_unlock_irqrestore(&adapter->erp_lock, flags);
+ return;
+ }
+ }
+ /* now port has no child or all children have completed recovery,
+ * and no ERP of severity >= port was meanwhile triggered elsewhere
+ */
+ zfcp_scsi_schedule_rport_register(port);
+ spin_unlock(shost->host_lock);
+ write_unlock_irqrestore(&adapter->erp_lock, flags);
+}
+