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>

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 3aa0a60d7c71e9625da707e5ba992c7ac2052903..cc030f87890530ebc8c0f66842896eb5376f78fe 100644 (file)
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -2225,7 +2225,7 @@ 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;