--- zzzz-none-000/linux-4.4.60/net/core/timestamping.c	2017-04-08 07:53:53.000000000 +0000
+++ maple-7510-730/linux-4.4.60/net/core/timestamping.c	2021-03-17 14:36:41.000000000 +0000
@@ -63,6 +63,9 @@
 	if (!skb->dev || !skb->dev->phydev || !skb->dev->phydev->drv)
 		return false;
 
+	if (!(skb->dev->phydev->advertising & ADVERTISED_PTP))
+		return false;
+
 	if (skb_headroom(skb) < ETH_HLEN)
 		return false;