bonding: create netlink event when bonding option is changed

Userspace needs to be notified if one changes some option.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Veaceslav Falico <vfalico@gmail.com>
Acked-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index dc73463..d8dc17f 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -625,6 +625,8 @@
 out:
 	if (ret)
 		bond_opt_error_interpret(bond, opt, ret, val);
+	else
+		call_netdevice_notifiers(NETDEV_CHANGEINFODATA, bond->dev);
 
 	return ret;
 }
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 38377392..7e2b0b8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1982,6 +1982,7 @@
 #define NETDEV_CHANGEUPPER	0x0015
 #define NETDEV_RESEND_IGMP	0x0016
 #define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
+#define NETDEV_CHANGEINFODATA	0x0018
 
 int register_netdevice_notifier(struct notifier_block *nb);
 int unregister_netdevice_notifier(struct notifier_block *nb);