gserial_alloc_line_no_console
ret = gserial_alloc_line_no_console(&opts->port_num);
EXPORT_SYMBOL_GPL(gserial_alloc_line_no_console);
int ret = gserial_alloc_line_no_console(line_num);
int gserial_alloc_line_no_console(unsigned char *port_line);