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[VLAN]: Simplify vlan unregistration

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Keep track of the number of VLAN devices in a vlan group. This allows
to have the caller sense when the group is going to be destroyed and
stop using it, which in turn allows to remove the wrapper around
unregister_vlan_dev for the NETDEV_UNREGISTER notifier and avoid
iterating over all possible VLAN ids whenever a device in unregistered.

Also fix what looks like a use-after-free (but is actually safe since
we're holding the RTNL), the real_dev reference should not be dropped
while we still use it.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-01-21 00:25:50 -08:00 • committed by David S. Miller
parent acc5efbcd2
commit af30151709
4 changed files with 23 additions and 63 deletions
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1
include/linux/if_vlan.h
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@ -82,6 +82,7 @@ extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
struct vlan_group {
int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
unsigned int nr_vlans;
struct hlist_node hlist; /* linked list */
struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
struct rcu_head rcu;