1 files changed, 53 insertions, 28 deletions

diff --git a/drivers/acpi/dispatcher/dsobject.c b/drivers/acpi/dispatcher/dsobject.c
index 8ac0cd93adb5..905a84e4b145 100644
--- a/drivers/acpi/dispatcher/dsobject.c
+++ b/drivers/acpi/dispatcher/dsobject.c
@@ -51,6 +51,7 @@
 #define _COMPONENT          ACPI_DISPATCHER
 ACPI_MODULE_NAME("dsobject")
 
+/* Local prototypes */
 static acpi_status
 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
 			      union acpi_parse_object *op,
@@ -85,7 +86,7 @@ acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
 	*obj_desc_ptr = NULL;
 	if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 		/*
-		 * This is an named object reference.  If this name was
+		 * This is a named object reference. If this name was
 		 * previously looked up in the namespace, it was stored in this op.
 		 * Otherwise, go ahead and look it up now
 		 */
@@ -96,18 +97,48 @@ acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
 						ACPI_IMODE_EXECUTE,
 						ACPI_NS_SEARCH_PARENT |
 						ACPI_NS_DONT_OPEN_SCOPE, NULL,
-						(struct acpi_namespace_node **)
-						&(op->common.node));
-
+						ACPI_CAST_INDIRECT_PTR(struct
+								       acpi_namespace_node,
+								       &(op->
+									 common.
+									 node)));
 			if (ACPI_FAILURE(status)) {
-				ACPI_REPORT_NSERROR(op->common.value.string,
-						    status);
+				/* Check if we are resolving a named reference within a package */
+
+				if ((status == AE_NOT_FOUND)
+				    && (acpi_gbl_enable_interpreter_slack)
+				    &&
+				    ((op->common.parent->common.aml_opcode ==
+				      AML_PACKAGE_OP)
+				     || (op->common.parent->common.aml_opcode ==
+					 AML_VAR_PACKAGE_OP))) {
+					/*
+					 * We didn't find the target and we are populating elements
+					 * of a package - ignore if slack enabled. Some ASL code
+					 * contains dangling invalid references in packages and
+					 * expects that no exception will be issued. Leave the
+					 * element as a null element. It cannot be used, but it
+					 * can be overwritten by subsequent ASL code - this is
+					 * typically the case.
+					 */
+					ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+							  "Ignoring unresolved reference in package [%4.4s]\n",
+							  walk_state->
+							  scope_info->scope.
+							  node->name.ascii));
+
+					return_ACPI_STATUS(AE_OK);
+				} else {
+					ACPI_REPORT_NSERROR(op->common.value.
+							    string, status);
+				}
+
 				return_ACPI_STATUS(status);
 			}
 		}
 	}
 
-	/* Create and init the internal ACPI object */
+	/* Create and init a new internal ACPI object */
 
 	obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
 						   (op->common.aml_opcode))->
@@ -157,13 +188,13 @@ acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
 
 	ACPI_FUNCTION_TRACE("ds_build_internal_buffer_obj");
 
+	/*
+	 * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
+	 * The buffer object already exists (from the NS node), otherwise it must
+	 * be created.
+	 */
 	obj_desc = *obj_desc_ptr;
-	if (obj_desc) {
-		/*
-		 * We are evaluating a Named buffer object "Name (xxxx, Buffer)".
-		 * The buffer object already exists (from the NS node)
-		 */
-	} else {
+	if (!obj_desc) {
 		/* Create a new buffer object */
 
 		obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
@@ -259,7 +290,7 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 	union acpi_operand_object *obj_desc = NULL;
 	u32 package_list_length;
 	acpi_status status = AE_OK;
-	u32 i;
+	acpi_native_uint i;
 
 	ACPI_FUNCTION_TRACE("ds_build_internal_package_obj");
 
@@ -271,13 +302,12 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 		parent = parent->common.parent;
 	}
 
+	/*
+	 * If we are evaluating a Named package object "Name (xxxx, Package)",
+	 * the package object already exists, otherwise it must be created.
+	 */
 	obj_desc = *obj_desc_ptr;
-	if (obj_desc) {
-		/*
-		 * We are evaluating a Named package object "Name (xxxx, Package)".
-		 * Get the existing package object from the NS node
-		 */
-	} else {
+	if (!obj_desc) {
 		obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 		*obj_desc_ptr = obj_desc;
 		if (!obj_desc) {
@@ -291,11 +321,9 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 
 	/* Count the number of items in the package list */
 
-	package_list_length = 0;
 	arg = op->common.value.arg;
 	arg = arg->common.next;
-	while (arg) {
-		package_list_length++;
+	for (package_list_length = 0; arg; package_list_length++) {
 		arg = arg->common.next;
 	}
 
@@ -322,12 +350,11 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 	}
 
 	/*
-	 * Now init the elements of the package
+	 * Initialize all elements of the package
 	 */
-	i = 0;
 	arg = op->common.value.arg;
 	arg = arg->common.next;
-	while (arg) {
+	for (i = 0; arg; i++) {
 		if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
 			/* Object (package or buffer) is already built */
 
@@ -340,8 +367,6 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 							       package.
 							       elements[i]);
 		}
-
-		i++;
 		arg = arg->common.next;
 	}