46e31db55d
JML register on probe will return zero . This register is configured later on macb_init_hw() which is called on open. Since we have zero, after header and FCS length subtraction we will get negative max_mtu size. This issue was affecting DSA drivers with MTU support (for example KSZ9477). Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>