Hi, the linux uart layer can loose some characters if the system is busy. uart_throttle/uart_unthrottle is called from a workqueue. If the system is busy, and the uart receive lot's of data, we fill the tty buffer, but the workqueue doesn't run and we never have a chance to call uart_throttle. So the uart is never slow down. And because most uart driver call uart_insert_char (that doesn't return if tty_insert_flip_char manage to push the character), we never detect that there are some lost characters. A workaround could be to check the buffer threshold in tty_flip_buffer_push and call throttle callback if needed. Matthieu -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
