ip6mr: 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>

1 files changed, 10 insertions, 5 deletions

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 85849b4f5a36..52e0f74fdfe0 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -477,7 +477,7 @@ failure:
  *      Delete a VIF entry
  */
 
-static int mif6_delete(struct net *net, int vifi)
+static int mif6_delete(struct net *net, int vifi, struct list_head *head)
 {
         struct mif_device *v;
         struct net_device *dev;
@@ -519,7 +519,7 @@ static int mif6_delete(struct net *net, int vifi)
                 in6_dev->cnf.mc_forwarding--;
 
         if (v->flags & MIFF_REGISTER)
-                unregister_netdevice(dev);
+                unregister_netdevice_queue(dev, head);
 
         dev_put(dev);
         return 0;
@@ -976,6 +976,7 @@ static int ip6mr_device_event(struct notifier_block *this,
         struct net *net = dev_net(dev);
         struct mif_device *v;
         int ct;
+        LIST_HEAD(list);
 
         if (event != NETDEV_UNREGISTER)
                 return NOTIFY_DONE;
@@ -983,8 +984,10 @@ static int ip6mr_device_event(struct notifier_block *this,
         v = &net->ipv6.vif6_table[0];
         for (ct = 0; ct < net->ipv6.maxvif; ct++, v++) {
                 if (v->dev == dev)
-                        mif6_delete(net, ct);
+                        mif6_delete(net, ct, &list);
         }
+        unregister_netdevice_many(&list);
+
         return NOTIFY_DONE;
 }
 
@@ -1188,14 +1191,16 @@ static int ip6mr_mfc_add(struct net *net, struct mf6cctl *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->ipv6.maxvif; i++) {
                 if (!(net->ipv6.vif6_table[i].flags & VIFF_STATIC))
-                        mif6_delete(net, i);
+                        mif6_delete(net, i, &list);
         }
+        unregister_netdevice_many(&list);
 
         /*
          *      Wipe the cache
@@ -1325,7 +1330,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
                 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
                         return -EFAULT;
                 rtnl_lock();
-                ret = mif6_delete(net, mifi);
+                ret = mif6_delete(net, mifi, NULL);
                 rtnl_unlock();
                 return ret;