[BRIDGE]: use kcalloc
[linux-2.6.git] / net / bridge / br_notify.c
1 /*
2  *      Device event handling
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
8  *      $Id: br_notify.c,v 1.2 2000/02/21 15:51:34 davem Exp $
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15
16 #include <linux/kernel.h>
17
18 #include "br_private.h"
19
20 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
21
22 struct notifier_block br_device_notifier = {
23         .notifier_call = br_device_event
24 };
25
26 /*
27  * Handle changes in state of network devices enslaved to a bridge.
28  * 
29  * Note: don't care about up/down if bridge itself is down, because
30  *     port state is checked when bridge is brought up.
31  */
32 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
33 {
34         struct net_device *dev = ptr;
35         struct net_bridge_port *p = dev->br_port;
36         struct net_bridge *br;
37
38         /* not a port of a bridge */
39         if (p == NULL)
40                 return NOTIFY_DONE;
41
42         br = p->br;
43
44         spin_lock_bh(&br->lock);
45         switch (event) {
46         case NETDEV_CHANGEMTU:
47                 dev_set_mtu(br->dev, br_min_mtu(br));
48                 break;
49
50         case NETDEV_CHANGEADDR:
51                 br_fdb_changeaddr(p, dev->dev_addr);
52                 br_stp_recalculate_bridge_id(br);
53                 break;
54
55         case NETDEV_CHANGE:
56                 if (br->dev->flags & IFF_UP)
57                         schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE);
58                 break;
59
60         case NETDEV_FEAT_CHANGE:
61                 if (br->dev->flags & IFF_UP) 
62                         br_features_recompute(br);
63
64                 /* could do recursive feature change notification
65                  * but who would care?? 
66                  */
67                 break;
68
69         case NETDEV_DOWN:
70                 if (br->dev->flags & IFF_UP)
71                         br_stp_disable_port(p);
72                 break;
73
74         case NETDEV_UP:
75                 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) 
76                         br_stp_enable_port(p);
77                 break;
78
79         case NETDEV_UNREGISTER:
80                 spin_unlock_bh(&br->lock);
81                 br_del_if(br, dev);
82                 goto done;
83         } 
84         spin_unlock_bh(&br->lock);
85
86  done:
87         return NOTIFY_DONE;
88 }