--- zzzz-none-000/linux-4.1.52/net/wireless/rdev-ops.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/net/wireless/rdev-ops.h	2022-03-02 11:37:14.000000000 +0000
@@ -1018,4 +1018,20 @@
 	trace_rdev_return_void(&rdev->wiphy);
 }
 
+#ifdef CONFIG_BCM_KF_CFG80211_BACKPORT
+static inline int
+rdev_external_auth(struct cfg80211_registered_device *rdev,
+		   struct net_device *dev,
+		   struct cfg80211_external_auth_params *params)
+{
+	int ret = -EOPNOTSUPP;
+
+	trace_rdev_external_auth(&rdev->wiphy, dev, params);
+	if (rdev->ops->external_auth)
+		ret = rdev->ops->external_auth(&rdev->wiphy, dev, params);
+	trace_rdev_return_int(&rdev->wiphy, ret);
+	return ret;
+}
+
+#endif
 #endif /* __CFG80211_RDEV_OPS */