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ipmr: Optimize multiple unregistration 

Speedup module unloading by factorizing synchronize_rcu() calls

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-10-28 05:21:38 +00:00 committed by David S. Miller
parent cf4432f550
commit d17fa6fa81
1 changed files with 10 additions and 5 deletions
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15
net/ipv4/ipmr.c
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@ -275,7 +275,8 @@ failure:
* @notify: Set to 1, if the caller is a notifier_call
*/
static int vif_delete(struct net *net, int vifi, int notify)
static int vif_delete(struct net *net, int vifi, int notify,
struct list_head *head)
{
struct vif_device *v;
struct net_device *dev;
@ -319,7 +320,7 @@ static int vif_delete(struct net *net, int vifi, int notify)
}
if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify)
unregister_netdevice(dev);
unregister_netdevice_queue(dev, head);
dev_put(dev);
return 0;
@ -870,14 +871,16 @@ static int ipmr_mfc_add(struct net *net, struct mfcctl *mfc, int mrtsock)
static void mroute_clean_tables(struct net *net)
{
int i;
LIST_HEAD(list);
/*
* Shut down all active vif entries
*/
for (i = 0; i < net->ipv4.maxvif; i++) {
if (!(net->ipv4.vif_table[i].flags&VIFF_STATIC))
vif_delete(net, i, 0);
vif_delete(net, i, 0, &list);
}
unregister_netdevice_many(&list);
/*
* Wipe the cache
@ -993,7 +996,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
if (optname == MRT_ADD_VIF) {
ret = vif_add(net, &vif, sk == net->ipv4.mroute_sk);
} else {
ret = vif_delete(net, vif.vifc_vifi, 0);
ret = vif_delete(net, vif.vifc_vifi, 0, NULL);
}
rtnl_unlock();
return ret;
@ -1156,6 +1159,7 @@ static int ipmr_device_event(struct notifier_block *this, unsigned long event, v
struct net *net = dev_net(dev);
struct vif_device *v;
int ct;
LIST_HEAD(list);
if (!net_eq(dev_net(dev), net))
return NOTIFY_DONE;
@ -1165,8 +1169,9 @@ static int ipmr_device_event(struct notifier_block *this, unsigned long event, v
v = &net->ipv4.vif_table[0];
for (ct = 0; ct < net->ipv4.maxvif; ct++, v++) {
if (v->dev == dev)
vif_delete(net, ct, 1);
vif_delete(net, ct, 1, &list);
}
unregister_netdevice_many(&list);
return NOTIFY_DONE;
}