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
Give a bad return code when specifying a router setting that is either invalid or not support on the respective device type. In addition, fall back the previous setting instead of silently switching back to 'no routing'. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>