Documentation: configfs examples crash fix
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / tipc / node_subscr.c
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1 /*
2 * net/tipc/node_subscr.c: TIPC "node down" subscription handling
4 * Copyright (c) 1995-2006, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, Wind River Systems
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37 #include "core.h"
38 #include "node_subscr.h"
39 #include "node.h"
41 /**
42 * tipc_nodesub_subscribe - create "node down" subscription for specified node
45 void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,
46 void *usr_handle, net_ev_handler handle_down)
48 if (addr == tipc_own_addr) {
49 node_sub->node = NULL;
50 return;
53 node_sub->node = tipc_node_find(addr);
54 if (!node_sub->node) {
55 warn("Node subscription rejected, unknown node 0x%x\n", addr);
56 return;
58 node_sub->handle_node_down = handle_down;
59 node_sub->usr_handle = usr_handle;
61 tipc_node_lock(node_sub->node);
62 list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
63 tipc_node_unlock(node_sub->node);
66 /**
67 * tipc_nodesub_unsubscribe - cancel "node down" subscription (if any)
70 void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub)
72 if (!node_sub->node)
73 return;
75 tipc_node_lock(node_sub->node);
76 list_del_init(&node_sub->nodesub_list);
77 tipc_node_unlock(node_sub->node);
80 /**
81 * tipc_nodesub_notify - notify subscribers that a node is unreachable
83 * Note: node is locked by caller
86 void tipc_nodesub_notify(struct tipc_node *node)
88 struct tipc_node_subscr *ns;
90 list_for_each_entry(ns, &node->nsub, nodesub_list) {
91 if (ns->handle_node_down) {
92 tipc_k_signal((Handler)ns->handle_node_down,
93 (unsigned long)ns->usr_handle);
94 ns->handle_node_down = NULL;