Linux Kernel  3.7.1
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node_subscr.c
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1 /*
2  * net/tipc/node_subscr.c: TIPC "node down" subscription handling
3  *
4  * Copyright (c) 1995-2006, Ericsson AB
5  * Copyright (c) 2005, 2010-2011, Wind River Systems
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. Neither the names of the copyright holders nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * Alternatively, this software may be distributed under the terms of the
21  * GNU General Public License ("GPL") version 2 as published by the Free
22  * Software Foundation.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34  * POSSIBILITY OF SUCH DAMAGE.
35  */
36 
37 #include "core.h"
38 #include "node_subscr.h"
39 #include "node.h"
40 
45  void *usr_handle, net_ev_handler handle_down)
46 {
47  if (in_own_node(addr)) {
48  node_sub->node = NULL;
49  return;
50  }
51 
52  node_sub->node = tipc_node_find(addr);
53  if (!node_sub->node) {
54  pr_warn("Node subscription rejected, unknown node 0x%x\n",
55  addr);
56  return;
57  }
58  node_sub->handle_node_down = handle_down;
59  node_sub->usr_handle = usr_handle;
60 
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);
64 }
65 
70 {
71  if (!node_sub->node)
72  return;
73 
74  tipc_node_lock(node_sub->node);
75  list_del_init(&node_sub->nodesub_list);
76  tipc_node_unlock(node_sub->node);
77 }
78 
85 {
86  struct tipc_node_subscr *ns;
87 
89  if (ns->handle_node_down) {
91  (unsigned long)ns->usr_handle);
92  ns->handle_node_down = NULL;
93  }
94  }
95 }