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vlan: cleanup multiple unregistrations

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The temporary copy of the VLAN group is not neccessary since the lower device
is already in the process of being unregistered, if it was neccessary the
memset of the global group would introduce a race condition.

With this removed, the changes to the original code are only a few lines, so
remove the new function and move the code back into vlan_device_event().

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2009-10-29 23:43:00 -07:00 committed by David S. Miller
parent f0816ce39d
commit 29906f6a42
1 changed files with 20 additions and 32 deletions
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52
net/8021q/vlan.c
View file

@ -161,10 +161,10 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
grp->nr_vlans--;
if (!grp->killall) {
vlan_group_set_device(grp, vlan_id, NULL);
vlan_group_set_device(grp, vlan_id, NULL);
if (!grp->killall)
synchronize_net();
}
unregister_netdevice_queue(dev, head);
/* If the group is now empty, kill off the group. */
@ -184,34 +184,6 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
dev_put(real_dev);
}
void unregister_vlan_dev_alls(struct vlan_group *grp)
{
LIST_HEAD(list);
int i;
struct net_device *vlandev;
struct vlan_group save;
memcpy(&save, grp, sizeof(save));
memset(&grp->vlan_devices_arrays, 0, sizeof(grp->vlan_devices_arrays));
grp->killall = 1;
synchronize_net();
/* Delete all VLANs for this dev. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(&save, i);
if (!vlandev)
continue;
unregister_vlan_dev(vlandev, &list);
if (grp->nr_vlans == 0)
break;
}
unregister_netdevice_many(&list);
for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
kfree(save.vlan_devices_arrays[i]);
}
static void vlan_transfer_operstate(const struct net_device *dev,
struct net_device *vlandev)
{
@ -456,6 +428,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
struct vlan_group *grp;
int i, flgs;
struct net_device *vlandev;
LIST_HEAD(list);
if (is_vlan_dev(dev))
__vlan_device_event(dev, event);
@ -553,7 +526,22 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
break;
case NETDEV_UNREGISTER:
unregister_vlan_dev_alls(grp);
/* Delete all VLANs for this dev. */
grp->killall = 1;
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
/* unregistration of last vlan destroys group, abort
* afterwards */
if (grp->nr_vlans == 1)
i = VLAN_GROUP_ARRAY_LEN;
unregister_vlan_dev(vlandev, &list);
}
unregister_netdevice_many(&list);
break;
}