1 files changed, 26 insertions, 2 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 0b2d777e5b9e..a4d39b87b4e5 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1752,6 +1752,28 @@ int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
 }
 EXPORT_SYMBOL(call_netdevice_notifiers);
 
+/**
+ *      call_netdevice_notifiers_mtu - call all network notifier blocks
+ *      @val: value passed unmodified to notifier function
+ *      @dev: net_device pointer passed unmodified to notifier function
+ *      @arg: additional u32 argument passed to the notifier function
+ *
+ *      Call all network notifier blocks.  Parameters and return value
+ *      are as for raw_notifier_call_chain().
+ */
+static int call_netdevice_notifiers_mtu(unsigned long val,
+                                        struct net_device *dev, u32 arg)
+{
+        struct netdev_notifier_info_ext info = {
+                .info.dev = dev,
+                .ext.mtu = arg,
+        };
+
+        BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0);
+
+        return call_netdevice_notifiers_info(val, &info.info);
+}
+
 #ifdef CONFIG_NET_INGRESS
 static DEFINE_STATIC_KEY_FALSE(ingress_needed_key);
 
@@ -7575,14 +7597,16 @@ int dev_set_mtu_ext(struct net_device *dev, int new_mtu,
         err = __dev_set_mtu(dev, new_mtu);
 
         if (!err) {
-                err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
+                err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
+                                                   orig_mtu);
                 err = notifier_to_errno(err);
                 if (err) {
                         /* setting mtu back and notifying everyone again,
                          * so that they have a chance to revert changes.
                          */
                         __dev_set_mtu(dev, orig_mtu);
-                        call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
+                        call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
+                                                     new_mtu);
                 }
         }
         return err;