net: macb: fix negative max_mtu size for sama5d3

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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>

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Oleksij Rempel 2022-06-17 09:16:07 +02:00 • committed by David S. Miller

parent 2c0ab32b73

commit 46e31db55d

1 changed files with 2 additions and 2 deletions

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drivers/net/ethernet/cadence/macb_main.c

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