ipv4: inetdev_by_index() switch to RCU

Use dev_get_by_index_rcu() instead of __dev_get_by_index() and
dev_base_lock rwlock

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

1 files changed, 4 insertions, 3 deletions

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 5df2f6a0b0f0..ccccaae50b20 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -405,11 +405,12 @@ struct in_device *inetdev_by_index(struct net *net, int ifindex)
 {
         struct net_device *dev;
         struct in_device *in_dev = NULL;
-        read_lock(&dev_base_lock);
-        dev = __dev_get_by_index(net, ifindex);
+
+        rcu_read_lock();
+        dev = dev_get_by_index_rcu(net, ifindex);
         if (dev)
                 in_dev = in_dev_get(dev);
-        read_unlock(&dev_base_lock);
+        rcu_read_unlock();
         return in_dev;
 }