REQUIRE_BEACON_GUARD
__set_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags);
(rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)))
!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))