From 40081f2107666899c45c5ce8aad5a3ce4c9417c4 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Fri, 4 Oct 2024 10:47:20 +0200
Subject: [PATCH] net: dsa: b53: allow lower MTUs on BCM5325/5365

[ Upstream commit e4b294f88a32438baf31762441f3dd1c996778be ]

While BCM5325/5365 do not support jumbo frames, they do support slightly
oversized frames, so do not error out if requesting a supported MTU for
them.

Fixes: 6ae5834b983a ("net: dsa: b53: add MTU configuration support")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/dsa/b53/b53_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 28b58dee6b8c..83f71c181a15 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -2223,7 +2223,7 @@ static int b53_change_mtu(struct dsa_switch *ds, int port, int mtu)
 	bool allow_10_100;
 
 	if (is5325(dev) || is5365(dev))
-		return -EOPNOTSUPP;
+		return 0;
 
 	if (!dsa_is_cpu_port(ds, port))
 		return 0;