[PATCH 4.20 20/76] net: dsa: mv88e6xxx: handle unknown duplex modes gracefully in mv88e6xxx_port_set_duplex

Greg Kroah-Hartman
2019-03-08T12:54:13Z

From: Heiner Kallweit <hkallweit1@gmail.com>

[ Upstream commit c6195a8bdfc62a7cecf7df685e64847a4b700275 ]

When testing another issue I faced the problem that
mv88e6xxx_port_setup_mac() failed due to DUPLEX_UNKNOWN being passed
as argument to mv88e6xxx_port_set_duplex(). We should handle this case
gracefully and return -EOPNOTSUPP, like e.g. mv88e6xxx_port_set_speed()
is doing it.

Fixes: 7f1ae07b51e8 ("net: dsa: mv88e6xxx: add port duplex setter")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/dsa/mv88e6xxx/port.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -190,7 +190,7 @@ int mv88e6xxx_port_set_duplex(struct mv8
/* normal duplex detection */
break;
default:
- return -EINVAL;
+ return -EOPNOTSUPP;
}

err = mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_MAC_CTL, reg);