int setup_one_line()

in drivers/line.c [362:412]

• 49 lines of code
• 9 McCabe index (conditional complexity)

int setup_one_line(struct line *lines, int n, char *init,
		   const struct chan_opts *opts, char **error_out)
{
	struct line *line = &lines[n];
	struct tty_driver *driver = line->driver->driver;
	int err = -EINVAL;

	if (line->port.count) {
		*error_out = "Device is already open";
		goto out;
	}

	if (!strcmp(init, "none")) {
		if (line->valid) {
			line->valid = 0;
			kfree(line->init_str);
			tty_unregister_device(driver, n);
			parse_chan_pair(NULL, line, n, opts, error_out);
			err = 0;
		}
	} else {
		char *new = kstrdup(init, GFP_KERNEL);
		if (!new) {
			*error_out = "Failed to allocate memory";
			return -ENOMEM;
		}
		if (line->valid) {
			tty_unregister_device(driver, n);
			kfree(line->init_str);
		}
		line->init_str = new;
		line->valid = 1;
		err = parse_chan_pair(new, line, n, opts, error_out);
		if (!err) {
			struct device *d = tty_port_register_device(&line->port,
					driver, n, NULL);
			if (IS_ERR(d)) {
				*error_out = "Failed to register device";
				err = PTR_ERR(d);
				parse_chan_pair(NULL, line, n, opts, error_out);
			}
		}
		if (err) {
			line->init_str = NULL;
			line->valid = 0;
			kfree(new);
		}
	}
out:
	return err;
}