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of_get_phy_mode may fail and return a negative error code; the fix checks the return value of of_get_phy_mode and returns -EINVAL of it fails. Signed-off-by: Kangjie Lu <kjlu@umn.edu> Acked-by: Maxime Ripard <maxime.ripard@bootlin.com> Signed-off-by: David S. Miller <davem@davemloft.net>