[ACPI] fix "Error getting context for object" warning

http://bugzilla.kernel.org/show_bug.cgi?id=3805Signed-off-by: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/bus.c

@@ -77,7 +77,7 @@ acpi_bus_get_device (
 
 	status = acpi_get_data(handle, acpi_bus_data_handler, (void**) device);
 	if (ACPI_FAILURE(status) || !*device) {
-		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context for object [%p]\n",
+		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "No context for object [%p]\n",
 			handle));
 		return_VALUE(-ENODEV);
 	}

drivers/pnp/pnpacpi/core.c

@@ -236,6 +236,8 @@ static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 
 	if (!acpi_bus_get_device(handle, &device))
 		pnpacpi_add_device(device);
+	else
+		return AE_CTRL_DEPTH;
 	return AE_OK;
 }
 
@@ -247,9 +249,7 @@ int __init pnpacpi_init(void)
 	}
 	pnp_info("PnP ACPI init");
 	pnp_register_protocol(&pnpacpi_protocol);
-	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
-			ACPI_UINT32_MAX, pnpacpi_add_device_handler,
-			NULL, NULL);
+	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 	pnp_info("PnP ACPI: found %d devices", num);
 	return 0;
 }