TX_BUFFER_INFO_FLAG_ACTIVE
if (!(buffer_info->flags & TX_BUFFER_INFO_FLAG_ACTIVE))
buffer_info->flags &= ~TX_BUFFER_INFO_FLAG_ACTIVE;
buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;
buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;
buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;