Re: [PATCH 06/14] tty/serial/core: Introduce poll_init callback

• tport = &state->port;
• if (!(tport->flags & ASYNC_INITIALIZED) && port->ops->poll_init) {

• mutex_lock(&tport->mutex);
  

• ret = port->ops->poll_init(port);
  

• /*
  

•  * We don't set ASYNCB_INITIALIZED as we only initialized the
  

•  * hw, e.g. state->xmit is still uninitialized.
  

•  */
  

• mutex_unlock(&tport->mutex);
  

• if (ret)
  

• 	return ret;
  

• }

What stops a parallel open or close changing ASYNC_INITIALIZED after you test and before you lock ?

Alan