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>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/acpi/namespace/nseval.c b/drivers/acpi/namespace/nseval.c
index d369164e00b0..0a1ae670a847 100644
--- 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