diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index cbd1885f2459..9ae38c3e2bf0 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1947,7 +1947,8 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
 		return n_stats;
 	if (n_stats > S32_MAX / sizeof(u64))
 		return -ENOMEM;
-	WARN_ON_ONCE(!n_stats);
+	if (WARN_ON_ONCE(!n_stats))
+		return -EOPNOTSUPP;
 
 	if (copy_from_user(&stats, useraddr, sizeof(stats)))
 		return -EFAULT;