QComboBox的currentIndexChanged信号死循环问题

connect(m_pComboBoxDevice, SIGNAL(currentIndexChanged(int)), this, SLOT(sltComboBoxDeviceCurrentTextChanged(int)));

void VideoGrid::updateListWidgetData()
{
　　//就像给信号量加锁一样：
　　m_pComboBoxDevice->blockSignals(true);   //锁上。addItem更改值时不触发currentIndexChanged信号
　　m_pComboBoxDevice->addItem(list[]);
　　m_pComboBoxDevice->blockSignals(false);   //解锁
}

void VideoGrid::sltComboBoxDeviceCurrentTextChanged(int index)
{
    updateListWidgetData();
}