ehea: New method to determine number of available ports

Count OFDT nodes to determine the number of available ports
instead of using the possibly outdated value from the hypervisor

Signed-off-by: Thomas Klein <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/ehea/ehea_main.c

···
 int ehea_sense_adapter_attr(struct ehea_adapter *adapter)
 {
 	struct hcp_query_ehea *cb;
+	struct device_node *lhea_dn = NULL;
+	struct device_node *eth_dn = NULL;
 	u64 hret;
 	int ret;
 
···
 		goto out_herr;
 	}
 
-	adapter->num_ports = cb->num_ports;
+	/* Determine the number of available logical ports
+	 * by counting the child nodes of the lhea OFDT entry
+	 */
+	adapter->num_ports = 0;
+	lhea_dn = of_find_node_by_name(lhea_dn, "lhea");
+	do {
+		eth_dn = of_get_next_child(lhea_dn, eth_dn);
+		if (eth_dn)
+			adapter->num_ports++;
+	} while ( eth_dn );
+	of_node_put(lhea_dn);
+
 	adapter->max_mc_mac = cb->max_mc_mac - 1;
 	ret = 0;