ipv6: use RCU to walk list of network devices

No longer need read_lock(&dev_base_lock), use RCU instead.
We also can avoid taking references on inet6_dev structs.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 8b266390b9e2..61425d0c6123 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1114,6 +1114,16 @@ static inline struct net_device *next_net_device(struct net_device *dev)
         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 }
 
+static inline struct net_device *next_net_device_rcu(struct net_device *dev)
+{
+        struct list_head *lh;
+        struct net *net;
+
+        net = dev_net(dev);
+        lh = rcu_dereference(dev->dev_list.next);
+        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
+}
+
 static inline struct net_device *first_net_device(struct net *net)
 {
         return list_empty(&net->dev_base_head) ? NULL :