readyRead() signal will be reemitted even I have called waitForReadyRead()

serial = new QSerialPort(this);
connect(serial, &QIODevice::readyRead, this, &Dialog::readResponse);

void Dialog::readResponse()
{
    qDebug() << "ready";
    QByteArray response = serial->readAll();
    while (serial->waitForReadyRead(1000)) {
        response += serial->readAll();
    }
    qDebug() << "done";
}

The document say that:

readyRead() is not emitted recursively; if you reenter the event loop or call waitForReadyRead() inside a slot connected to the readyRead() signal, the signal will not be reemitted  

my understanding is `readResonpse` will only be called once when there were data can be read from serial port until `readResponse` returned, but from my observation,  the "ready" message were printed multiple times, even the "done" message has never been printed