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Commit d17fa6fa authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

ipmr: Optimize multiple unregistration 



Speedup module unloading by factorizing synchronize_rcu() calls

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cf4432f5

net/ipv4/ipmr.c

+10 −5
Original line number Diff line number Diff line
@@ -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;

}