Commit c381fc3a authored Apr 17, 2017 by Rafael J. Wysocki

ACPI / scan: Avoid enumerating devices more than once



acpi_bus_attach() does not check the visited flag for devices that
have been enumerated already and some of them may be enumerated
for multiple times as a result, because some callers of
acpi_bus_scan() don't check the visited flag either.

For this reason, modify acpi_bus_attach() to check the visited flag
and avoid enumerating devices that have already been enumerated.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Joey Lee <jlee@suse.com>

parent f5beabfe

drivers/acpi/scan.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1840,6 +1840,8 @@ static void acpi_bus_attach(struct acpi_device *device)
		device->flags.power_manageable = 0;

		device->flags.initialized = true;
		} else if (device->flags.visited) {
		goto ok;
		}

		ret = acpi_scan_attach_handler(device);

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