1 files changed, 21 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index c95d664b2b42..9d4369ece679 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4544,6 +4544,27 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev,
 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
 
 /**
+ * netdev_lower_get_first_private_rcu - Get the first ->private from the
+ *                                     lower neighbour list, RCU
+ *                                     variant
+ * @dev: device
+ *
+ * Gets the first netdev_adjacent->private from the dev's lower neighbour
+ * list. The caller must hold RCU read lock.
+ */
+void *netdev_lower_get_first_private_rcu(struct net_device *dev)
+{
+        struct netdev_adjacent *lower;
+
+        lower = list_first_or_null_rcu(&dev->adj_list.lower,
+                        struct netdev_adjacent, list);
+        if (lower)
+                return lower->private;
+        return NULL;
+}
+EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
+
+/**
  * netdev_master_upper_dev_get_rcu - Get master upper device
  * @dev: device
  *