if (ACPI_SUCCESS (status) && walk_state->result_obj) {
if (walk_state->result_obj) {
acpi_ds_exec_end_op (	struct acpi_walk_state          *walk_state){	union acpi_parse_object         *op;	acpi_status                     status = AE_OK;	u32                             op_type;	u32                             op_class;	union acpi_parse_object         *next_op;	union acpi_parse_object         *first_arg;	ACPI_FUNCTION_TRACE_PTR ("ds_exec_end_op", walk_state);	op      = walk_state->op;	op_type = walk_state->op_info->type;	op_class = walk_state->op_info->class;	if (op_class == AML_CLASS_UNKNOWN) {		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown opcode %X\n", op->common.aml_opcode));		return_ACPI_STATUS (AE_NOT_IMPLEMENTED);	}	first_arg = op->common.value.arg;	/* Init the walk state */	walk_state->num_operands = 0;	walk_state->return_desc = NULL;	walk_state->result_obj = NULL;	/* Call debugger for single step support (DEBUG build only) */	ACPI_DEBUGGER_EXEC (status = acpi_db_single_step (walk_state, op, op_class));	ACPI_DEBUGGER_EXEC (if (ACPI_FAILURE (status)) {return_ACPI_STATUS (status);});	/* Decode the Opcode Class */	switch (op_class) {	case AML_CLASS_ARGUMENT:    /* constants, literals, etc. -- do nothing */		break;	case AML_CLASS_EXECUTE:     /* most operators with arguments */		/* Build resolved operand stack */		status = acpi_ds_create_operands (walk_state, first_arg);		if (ACPI_FAILURE (status)) {			goto cleanup;		}		/* Done with this result state (Now that operand stack is built) */		status = acpi_ds_result_stack_pop (walk_state);		if (ACPI_FAILURE (status)) {			goto cleanup;		}		/*		 * All opcodes require operand resolution, with the only exceptions		 * being the object_type and size_of operators.		 */		if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {			/* Resolve all operands */			status = acpi_ex_resolve_operands (walk_state->opcode,					  &(walk_state->operands [walk_state->num_operands -1]),					  walk_state);			if (ACPI_SUCCESS (status)) {				ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,						  acpi_ps_get_opcode_name (walk_state->opcode),						  walk_state->num_operands, "after ex_resolve_operands");			}		}		if (ACPI_SUCCESS (status)) {			/*			 * Dispatch the request to the appropriate interpreter handler			 * routine.  There is one routine per opcode "type" based upon the			 * number of opcode arguments and return type.			 */			status = acpi_gbl_op_type_dispatch[op_type] (walk_state);		}		else {			/*			 * Treat constructs of the form "Store(local_x,local_x)" as noops when the			 * Local is uninitialized.			 */			if  ((status == AE_AML_UNINITIALIZED_LOCAL) &&				(walk_state->opcode == AML_STORE_OP) &&				(walk_state->operands[0]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&				(walk_state->operands[1]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&				(walk_state->operands[0]->reference.opcode ==				 walk_state->operands[1]->reference.opcode) &&				(walk_state->operands[0]->reference.offset ==				 walk_state->operands[1]->reference.offset)) {				status = AE_OK;			}			else {				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,					"[%s]: Could not resolve operands, %s\n",					acpi_ps_get_opcode_name (walk_state->opcode),					acpi_format_exception (status)));			}		}		/* Always delete the argument objects and clear the operand stack */		acpi_ds_clear_operands (walk_state);		/*		 * If a result object was returned from above, push it on the		 * current result stack		 */		if (ACPI_SUCCESS (status) &&			walk_state->result_obj) {			status = acpi_ds_result_push (walk_state->result_obj, walk_state);		}		break;	default:		switch (op_type) {		case AML_TYPE_CONTROL:    /* Type 1 opcode, IF/ELSE/WHILE/NOOP */			/* 1 Operand, 0 external_result, 0 internal_result */			status = acpi_ds_exec_end_control_op (walk_state, op);			/* Make sure to properly pop the result stack */			if (ACPI_SUCCESS (status)) {				status = acpi_ds_result_stack_pop (walk_state);			}			else if (status == AE_CTRL_PENDING) {				status = acpi_ds_result_stack_pop (walk_state);				if (ACPI_SUCCESS (status)) {					status = AE_CTRL_PENDING;				}			}			break;		case AML_TYPE_METHOD_CALL:			/*			 * If the method is referenced from within a package			 * declaration, it is not a invocation of the method, just			 * a reference to it.			 */			if ((op->asl.parent) &&			   ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP) ||				(op->asl.parent->asl.aml_opcode == AML_VAR_PACKAGE_OP))) {				ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method Reference in a Package, Op=%p\n", op));				op->common.node = (struct acpi_namespace_node *) op->asl.value.arg->asl.node->object;				acpi_ut_add_reference (op->asl.value.arg->asl.node->object);				return_ACPI_STATUS (AE_OK);			}			ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method invocation, Op=%p\n", op));			/*			 * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains			 * the method Node pointer			 */			/* next_op points to the op that holds the method name */			next_op = first_arg;			/* next_op points to first argument op */			next_op = next_op->common.next;			/*			 * Get the method's arguments and put them on the operand stack			 */			status = acpi_ds_create_operands (walk_state, next_op);			if (ACPI_FAILURE (status)) {				break;			}			/*			 * Since the operands will be passed to another control method,			 * we must resolve all local references here (Local variables,			 * arguments to *this* method, etc.)			 */			status = acpi_ds_resolve_operands (walk_state);			if (ACPI_FAILURE (status)) {				/* On error, clear all resolved operands */				acpi_ds_clear_operands (walk_state);				break;			}			/*			 * Tell the walk loop to preempt this running method and			 * execute the new method			 */			status = AE_CTRL_TRANSFER;			/*			 * Return now; we don't want to disturb anything,			 * especially the operand count!			 */			return_ACPI_STATUS (status);		case AML_TYPE_CREATE_FIELD:			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,				"Executing create_field Buffer/Index Op=%p\n", op));			status = acpi_ds_load2_end_op (walk_state);			if (ACPI_FAILURE (status)) {				break;			}			status = acpi_ds_eval_buffer_field_operands (walk_state, op);			break;		case AML_TYPE_CREATE_OBJECT:			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,				"Executing create_object (Buffer/Package) Op=%p\n", op));			switch (op->common.parent->common.aml_opcode) {			case AML_NAME_OP:				/*				 * Put the Node on the object stack (Contains the ACPI Name of				 * this object)				 */				walk_state->operands[0] = (void *) op->common.parent->common.node;				walk_state->num_operands = 1;				status = acpi_ds_create_node (walk_state, op->common.parent->common.node, op->common.parent);				if (ACPI_FAILURE (status)) {					break;				}				/* Fall through */				/*lint -fallthrough */			case AML_INT_EVAL_SUBTREE_OP:				status = acpi_ds_eval_data_object_operands (walk_state, op,						  acpi_ns_get_attached_object (op->common.parent->common.node));				break;			default:				status = acpi_ds_eval_data_object_operands (walk_state, op, NULL);				break;			}			/* Done with this result state (Now that operand stack is built) */			status = acpi_ds_result_stack_pop (walk_state);			if (ACPI_FAILURE (status)) {				goto cleanup;			}			/*			 * If a result object was returned from above, push it on the			 * current result stack			 */			if (ACPI_SUCCESS (status) &&				walk_state->result_obj) {				status = acpi_ds_result_push (walk_state->result_obj, walk_state);			}			break;		case AML_TYPE_NAMED_FIELD:		case AML_TYPE_NAMED_COMPLEX:		case AML_TYPE_NAMED_SIMPLE:		case AML_TYPE_NAMED_NO_OBJ:			status = acpi_ds_load2_end_op (walk_state);			if (ACPI_FAILURE (status)) {				break;			}			if (op->common.aml_opcode == AML_REGION_OP) {				ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,					"Executing op_region Address/Length Op=%p\n", op));				status = acpi_ds_eval_region_operands (walk_state, op);				if (ACPI_FAILURE (status)) {					break;				}				status = acpi_ds_result_stack_pop (walk_state);			}			break;		case AML_TYPE_UNDEFINED:			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Undefined opcode type Op=%p\n", op));			return_ACPI_STATUS (AE_NOT_IMPLEMENTED);		case AML_TYPE_BOGUS:			ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,				"Internal opcode=%X type Op=%p\n",				walk_state->opcode, op));			break;		default:			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,				"Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p\n",				op_class, op_type, op->common.aml_opcode, op));			status = AE_NOT_IMPLEMENTED;			break;		}	}	/*	 * ACPI 2.0 support for 64-bit integers: Truncate numeric	 * result value if we are executing from a 32-bit ACPI table	 */	acpi_ex_truncate_for32bit_table (walk_state->result_obj);	/*	 * Check if we just completed the evaluation of a	 * conditional predicate	 */	if ((ACPI_SUCCESS (status)) &&		(walk_state->control_state) &&		(walk_state->control_state->common.state ==			ACPI_CONTROL_PREDICATE_EXECUTING) &&		(walk_state->control_state->control.predicate_op == op)) {		status = acpi_ds_get_predicate_value (walk_state, walk_state->result_obj);		walk_state->result_obj = NULL;	}cleanup:	/* Invoke exception handler on error */	if (ACPI_FAILURE (status) &&		acpi_gbl_exception_handler &&		!(status & AE_CODE_CONTROL)) {		acpi_ex_exit_interpreter ();		status = acpi_gbl_exception_handler (status,				 walk_state->method_node->name.integer, walk_state->opcode,				 walk_state->aml_offset, NULL);		acpi_ex_enter_interpreter ();	}	if (walk_state->result_obj) {		/* Break to debugger to display result */		ACPI_DEBUGGER_EXEC (acpi_db_display_result_object (walk_state->result_obj, walk_state));		/*		 * Delete the result op if and only if:		 * Parent will not use the result -- such as any		 * non-nested type2 op in a method (parent will be method)		 */		acpi_ds_delete_result_if_not_used (op, walk_state->result_obj, walk_state);	}#ifdef _UNDER_DEVELOPMENT	if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {		acpi_db_method_end (walk_state);	}#endif	/* Always clear the object stack */	walk_state->num_operands = 0;#ifdef ACPI_DISASSEMBLER	/* On error, display method locals/args */	if (ACPI_FAILURE (status)) {		acpi_dm_dump_method_info (status, walk_state, op);	}#endif	return_ACPI_STATUS (status);}