From 8ab55ac9678ca1f50f786c84484599dd675c5a9f Mon Sep 17 00:00:00 2001
From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Date: Wed, 18 May 2022 23:53:09 +0200
Subject: [PATCH 736/768] net: dsa: lantiq_gswip: Use dsa_is_cpu_port() in
 gswip_port_change_mtu()

Make the check for the CPU port in gswip_port_change_mtu() consistent
with other areas of the driver by using dsa_is_cpu_port().

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/net/dsa/lantiq_gswip.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1463,12 +1463,11 @@ static int gswip_port_max_mtu(struct dsa
 static int gswip_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
 {
 	struct gswip_priv *priv = ds->priv;
-	int cpu_port = priv->hw_info->cpu_port;
 
 	/* CPU port always has maximum mtu of user ports, so use it to set
 	 * switch frame size, including 8 byte special header.
 	 */
-	if (port == cpu_port) {
+	if (dsa_is_cpu_port(ds, port)) {
 		new_mtu += 8;
 		gswip_switch_w(priv, VLAN_ETH_HLEN + new_mtu + ETH_FCS_LEN,
 			       GSWIP_MAC_FLEN);
