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>

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 6949745..ef4ee45 100644 (file)
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -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;
 }