net: rtnetlink: ignore NETDEV_PRE_TYPE_CHANGE in rtnetlink_event()

Ignore the new NETDEV_PRE_TYPE_CHANGE event in rtnetlink_event() since
there have been no changes userspace needs to be notified of.

Also add a comment to the netdev notifier event definitions to remind
people to update the exclusion list when adding new event types.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index f3635fc6e942..9c5d3fad01f3 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -182,7 +182,10 @@ static inline int notifier_to_errno(int ret)
  *      VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
  */
  
-/* netdevice notifier chain */
+/* netdevice notifier chain. Please remember to update the rtnetlink
+ * notification exclusion list in rtnetlink_event() when adding new
+ * types.
+ */
 #define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
 #define NETDEV_DOWN     0x0002
 #define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index e1121f0bca6a..ffc6cf3495ac 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1513,6 +1513,7 @@ static int rtnetlink_event(struct notifier_block *this, unsigned long event, voi
         case NETDEV_POST_INIT:
         case NETDEV_REGISTER:
         case NETDEV_CHANGE:
+        case NETDEV_PRE_TYPE_CHANGE:
         case NETDEV_GOING_DOWN:
         case NETDEV_UNREGISTER:
         case NETDEV_UNREGISTER_BATCH: