Function scan_bus

src/device/device.c:377–408

* Scan for devices on a bus. * * If there are bridges on the bus, recursively scan the buses behind the * bridges. If the setting up and tuning of the bus causes a reset to be * required, reset the bus and scan it again. * * @param busdev Pointer to the bus device. */

 * @param busdev Pointer to the bus device.
 */
static void scan_bus(struct device *busdev)
{
	int do_scan_bus;
	struct stopwatch sw;
	long scan_time;

	if (!busdev->enabled)
		return;

	printk(BIOS_DEBUG, "%s scanning...\n", dev_path(busdev));

	post_log_path(busdev);

	stopwatch_init(&sw);

	do_scan_bus = 1;
	while (do_scan_bus) {
		struct bus *link = busdev->downstream;
		busdev->ops->scan_bus(busdev);
		do_scan_bus = 0;
		if (!link || !link->reset_needed)
			continue;
		if (reset_bus(link))
			do_scan_bus = 1;
		else
			busdev->upstream->reset_needed = 1;
	}

	scan_time = stopwatch_duration_msecs(&sw);
	printk(BIOS_DEBUG, "%s: bus %s finished in %ld msecs\n", __func__,
	       dev_path(busdev), scan_time);
}

void scan_bridges(struct bus *bus)
{