ACPICA: Disallow evaluation of named object types with no value

Return AE_TYPE for objects that have no value and therefore
evaluation is undefined: Device, Event, Mutex, Region, Thermal,
and Scope.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/namespace/nseval.c b/drivers/acpi/namespace/nseval.c
index d369164..0a1ae67 100644 (file)
--- a/drivers/acpi/namespace/nseval.c
+++ b/drivers/acpi/namespace/nseval.c
@@ -195,7 +195,28 @@ acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
        } else {
                /*
                 * 2) Object is not a method, return its current value
+                *
+                * Disallow certain object types. For these, "evaluation" is undefined.
                 */
+               switch (info->resolved_node->type) {
+               case ACPI_TYPE_DEVICE:
+               case ACPI_TYPE_EVENT:
+               case ACPI_TYPE_MUTEX:
+               case ACPI_TYPE_REGION:
+               case ACPI_TYPE_THERMAL:
+               case ACPI_TYPE_LOCAL_SCOPE:
+
+                       ACPI_ERROR((AE_INFO,
+                                   "[%4.4s] Evaluation of object type [%s] is not supported",
+                                   info->resolved_node->name.ascii,
+                                   acpi_ut_get_type_name(info->resolved_node->
+                                                         type)));
+
+                       return_ACPI_STATUS(AE_TYPE);
+
+               default:
+                       break;
+               }
 
                /*
                 * Objects require additional resolution steps (e.g., the Node may be