mt76_has_tx_pending
wait_event_timeout(dev->tx_wait, !mt76_has_tx_pending(phy), timeout);
EXPORT_SYMBOL_GPL(mt76_has_tx_pending);
bool mt76_has_tx_pending(struct mt76_phy *phy);
!mt76_has_tx_pending(&dev->mphy), HZ / 2);
ret = wait_event_timeout(dev->tx_wait, !mt76_has_tx_pending(&dev->phy),