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[PATCH] lockdep: annotate vlan net device as being a special class 

vlan network devices have devices nesting below it, and are a special
"super class" of normal network devices; split their locks off into a
separate class since they always nest.

[deweerdt@free.fr: fix possible null-pointer deref]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Arjan van de Ven 2006-07-03 00:25:33 -07:00 committed by Linus Torvalds
parent 663d440eaa
commit 5dd8d1e9eb
1 changed files with 11 additions and 0 deletions
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11
net/8021q/vlan.c
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@ -364,6 +364,14 @@ static void vlan_transfer_operstate(const struct net_device *dev, struct net_dev
}
}
/*
* vlan network devices have devices nesting below it, and are a special
* "super class" of normal network devices; split their locks off into a
* separate class since they always nest.
*/
static struct lock_class_key vlan_netdev_xmit_lock_key;
/* Attach a VLAN device to a mac address (ie Ethernet Card).
* Returns the device that was created, or NULL if there was
* an error of some kind.
@ -460,6 +468,7 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
vlan_setup);
if (new_dev == NULL)
goto out_unlock;
@ -518,6 +527,8 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
if (register_netdevice(new_dev))
goto out_free_newdev;
lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
new_dev->iflink = real_dev->ifindex;
vlan_transfer_operstate(real_dev, new_dev);
linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */