/* * net/tipc/node_subscr.c: TIPC "node down" subscription handling * * Copyright (c) 1995-2006, Ericsson AB * Copyright (c) 2005, 2010-2011, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its *    contributors may be used to endorse or promote products derived from *    this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "core.h"#include "node_subscr.h"#include "node.h" /** * tipc_nodesub_subscribe - create "node down" subscription for specified node */void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,			    void *usr_handle, net_ev_handler handle_down){	if (in_own_node(addr)) {		node_sub->node = NULL;		return;	} 	node_sub->node = tipc_node_find(addr);	if (!node_sub->node) {		pr_warn("Node subscription rejected, unknown node 0x%x\n",			addr);		return;	}	node_sub->handle_node_down = handle_down;	node_sub->usr_handle = usr_handle; 	tipc_node_lock(node_sub->node);	list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);	tipc_node_unlock(node_sub->node);} /** * tipc_nodesub_unsubscribe - cancel "node down" subscription (if any) */void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub){	if (!node_sub->node)		return; 	tipc_node_lock(node_sub->node);	list_del_init(&node_sub->nodesub_list);	tipc_node_unlock(node_sub->node);} /** * tipc_nodesub_notify - notify subscribers that a node is unreachable * * Note: node is locked by caller */void tipc_nodesub_notify(struct tipc_node *node){	struct tipc_node_subscr *ns; 	list_for_each_entry(ns, &node->nsub, nodesub_list) {		if (ns->handle_node_down) {			tipc_k_signal((Handler)ns->handle_node_down,				      (unsigned long)ns->usr_handle);			ns->handle_node_down = NULL;		}	}}