code: func (pm *PluginManager) podLock(fullPodName string) *sync.Mutex {
  	pm.podsLock.Lock()
  	defer pm.podsLock.Unlock()
  
  	lock, ok := pm.pods[fullPodName]
  	if !ok {
  		lock = &podLock{}
  		pm.pods[fullPodName] = lock
  	}
  	lock.refcount++
  	return &lock.mu
  }
docs: // Lock network operations for a specific pod.  If that pod is not yet in
  // the pod map, it will be added.  The reference count for the pod will
  // be increased.