EFX_EF10_FILTER_FLAG_BUSY
if (EFE_SPEC(eftp, index) & EFX_EF10_FILTER_FLAG_BUSY)
EFE_SPEC(eftp, index) |= (uintptr_t)EFX_EF10_FILTER_FLAG_BUSY;
EFE_SPEC(eftp, index) &= ~(uintptr_t)EFX_EF10_FILTER_FLAG_BUSY;