bonding: permit enslaving interfaces without set_mac support
Currently we exit if the slave isn't the first slave, doesn't support mac address setting and fail_over_mac isn't FOM_ACTIVE. It's wrong because we only require ndo_set_mac_address in case bonding is in active-backup mode and FOM isn't FOM_ACTIVE. To fix this - only exit with an error if we're in a/b mode and have fail_over_mac != FOM_ACTIVE. Also, maintain current behaviour on the first slave (forcibly change fom to FOM_ACTIVE) to not break anyone's configuration. CC: Jay Vosburgh <j.vosburgh@gmail.com> CC: Andy Gospodarek <andy@greyhouse.net> Signed-off-by: Veaceslav Falico <vfalico@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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