net: dsa: use ports list to find first CPU port

Use the new ports list instead of iterating over switches and their
ports when looking up the first CPU port in the tree.

Signed-off-by: Vivien Didelot <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

Author: vivien

net/dsa/dsa2.c

@@ -186,22 +186,11 @@ static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
 
 static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
 {
-	struct dsa_switch *ds;
 	struct dsa_port *dp;
-	int device, port;
-
-	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
-		ds = dst->ds[device];
-		if (!ds)
-			continue;
 
-		for (port = 0; port < ds->num_ports; port++) {
-			dp = &ds->ports[port];
-
-			if (dsa_port_is_cpu(dp))
-				return dp;
-		}
-	}
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dsa_port_is_cpu(dp))
+			return dp;
 
 	return NULL;
 }