[PATCH 2/2] ACPI / scan: Avoid enumerating devices more than once

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

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@xxxxxxxxx>
---
 drivers/acpi/scan.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -1850,6 +1850,8 @@ static void acpi_bus_attach(struct acpi_
 			device->flags.power_manageable = 0;
 
 		device->flags.initialized = true;
+	} else if (device->flags.visited) {
+		goto ok;
 	}
 
 	ret = acpi_scan_attach_handler(device);