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Check whether first PCI read returns 0xffffffff. Currently, if this is the case, the user sees the following misleading message: unknown chip XID fcf, contact r8169 maintainers (see MAINTAINERS file) Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Link: https://lore.kernel.org/r/75b54d23-fefe-2bf4-7e80-c9d3bc91af11@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>