04.05.2013 15:15, Johan Hovold пишет:
The query takes longer than the transmit at decent baudrates (>=38k) and under the assumption that flow control isn't causing any delays. But you do have a point, and I have been meaning to look into whether the added overhead of checking the hardware buffers could be mitigated by adding wait_until_sent support to usb-serial. This way the we would only query the hardware buffers on tty_wait_until_sent (e.g. at close) and select and TIOCMOUTQ would not suffer. This is also the way things are handled in serial_core.
Thanks for taking a look. Indeed, it seems .wait_until_sent is the best candidate for that kind of things, and the patch in question would even match its description be it using .wait_until_sent and not .chars_in_buffer. Please count on testing your patches here when they are ready. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
