bonding: Fix bonding crash

[firefly-linux-kernel-4.4.55.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index 9efbdb3ff78a0098b83f60e0c626da933035e983..de4ed2b5a221c73f698e74b071ca8a87b504413f 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3721,6 +3721,22 @@ static inline struct sk_buff *handle_ing(struct sk_buff *skb,
        return skb;
 }
 
+/**
+ *     netdev_is_rx_handler_busy - check if receive handler is registered
+ *     @dev: device to check
+ *
+ *     Check if a receive handler is already registered for a given device.
+ *     Return true if there one.
+ *
+ *     The caller must hold the rtnl_mutex.
+ */
+bool netdev_is_rx_handler_busy(struct net_device *dev)
+{
+       ASSERT_RTNL();
+       return dev && rtnl_dereference(dev->rx_handler);
+}
+EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy);
+
 /**
  *     netdev_rx_handler_register - register receive handler
  *     @dev: device to register a handler for