ethtool: add PRIVFLAGS_NTF notification

Send ETHTOOL_MSG_PRIVFLAGS_NTF notification whenever private flags of
a network device are modified using ETHTOOL_MSG_PRIVFLAGS_SET netlink
message or ETHTOOL_SPFLAGS ioctl request.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ethtool/privflags.c b/net/ethtool/privflags.c
index dfa76d5..e8f03b3 100644
--- a/net/ethtool/privflags.c
+++ b/net/ethtool/privflags.c
@@ -194,6 +194,9 @@ int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
 	if (ret < 0 || !mod)
 		goto out_free;
 	ret = ops->set_priv_flags(dev, flags);
+	if (ret < 0)
+		goto out_free;
+	ethtool_notify(dev, ETHTOOL_MSG_PRIVFLAGS_NTF, NULL);
 
 out_free:
 	kfree(names);