/* This function is used to send a high-priority XON/XOFF character to the device  */
static void rs_send_xchar(struct tty_struct *tty, char ch)
/* This function is used to send a high-priority XON/XOFF character to the device  */
static void rs_send_xchar(struct tty_struct *tty, char ch)
{
	struct async_struct *info = (struct async_struct *)tty->driver_data;
	info->x_char = ch;
	if (ch) {
		transmit_chars(info, NULL);
	}
}