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path: root/drivers/acpi/namespace/nseval.c
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Diffstat (limited to 'drivers/acpi/namespace/nseval.c')
-rw-r--r--drivers/acpi/namespace/nseval.c73
1 files changed, 62 insertions, 11 deletions
diff --git a/drivers/acpi/namespace/nseval.c b/drivers/acpi/namespace/nseval.c
index d369164..4cdf03a 100644
--- a/drivers/acpi/namespace/nseval.c
+++ b/drivers/acpi/namespace/nseval.c
@@ -78,6 +78,7 @@ ACPI_MODULE_NAME("nseval")
acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
{
acpi_status status;
+ struct acpi_namespace_node *node;
ACPI_FUNCTION_TRACE(ns_evaluate);
@@ -117,6 +118,8 @@ acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
info->resolved_node,
acpi_ns_get_attached_object(info->resolved_node)));
+ node = info->resolved_node;
+
/*
* Two major cases here:
*
@@ -148,21 +151,22 @@ acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
info->param_count++;
}
- /* Error if too few arguments were passed in */
+ /*
+ * Warning if too few or too many arguments have been passed by the
+ * caller. We don't want to abort here with an error because an
+ * incorrect number of arguments may not cause the method to fail.
+ * However, the method will fail if there are too few arguments passed
+ * and the method attempts to use one of the missing ones.
+ */
if (info->param_count < info->obj_desc->method.param_count) {
- ACPI_ERROR((AE_INFO,
+ ACPI_WARNING((AE_INFO,
"Insufficient arguments - "
"method [%4.4s] needs %d, found %d",
acpi_ut_get_node_name(info->resolved_node),
info->obj_desc->method.param_count,
info->param_count));
- return_ACPI_STATUS(AE_MISSING_ARGUMENTS);
- }
-
- /* Just a warning if too many arguments */
-
- else if (info->param_count >
+ } else if (info->param_count >
info->obj_desc->method.param_count) {
ACPI_WARNING((AE_INFO,
"Excess arguments - "
@@ -195,7 +199,28 @@ 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
@@ -239,9 +264,35 @@ acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
}
}
- /*
- * Check if there is a return value that must be dealt with
- */
+ /* Validation of return values for ACPI-predefined methods and objects */
+
+ if ((status == AE_OK) || (status == AE_CTRL_RETURN_VALUE)) {
+ /*
+ * If this is the first evaluation, check the return value. This
+ * ensures that any warnings will only be emitted during the very
+ * first evaluation of the object.
+ */
+ if (!(node->flags & ANOBJ_EVALUATED)) {
+ /*
+ * Check for a predefined ACPI name. If found, validate the
+ * returned object.
+ *
+ * Note: Ignore return status for now, emit warnings if there are
+ * problems with the returned object. May change later to abort
+ * the method on invalid return object.
+ */
+ (void)acpi_ns_check_predefined_names(node,
+ info->
+ return_object);
+ }
+
+ /* Mark the node as having been evaluated */
+
+ node->flags |= ANOBJ_EVALUATED;
+ }
+
+ /* Check if there is a return value that must be dealt with */
+
if (status == AE_CTRL_RETURN_VALUE) {
/* If caller does not want the return value, delete it */