utdelete.c

linux-2.6.15.6

	case REF_INCREMENT:

		new_count++;
		object->common.reference_count = new_count;

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "Obj %p Refs=%X, [Incremented]\n",
				  object, new_count));
		break;

	case REF_DECREMENT:

		if (count < 1) {
			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
					  object, new_count));

			new_count = 0;
		} else {
			new_count--;

			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Obj %p Refs=%X, [Decremented]\n",
					  object, new_count));
		}

		if (ACPI_GET_OBJECT_TYPE(object) == ACPI_TYPE_METHOD) {
			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Method Obj %p Refs=%X, [Decremented]\n",
					  object, new_count));
		}

		object->common.reference_count = new_count;
		if (new_count == 0) {
			acpi_ut_delete_internal_obj(object);
		}

		break;

	case REF_FORCE_DELETE:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "Obj %p Refs=%X, Force delete! (Set to 0)\n",
				  object, count));

		new_count = 0;
		object->common.reference_count = new_count;
		acpi_ut_delete_internal_obj(object);
		break;

	default:

		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown action (%X)\n",
				  action));
		break;
	}

	/*
	 * Sanity check the reference count, for debug purposes only.
	 * (A deleted object will have a huge reference count)
	 */
	if (count > ACPI_MAX_REFERENCE_COUNT) {

		ACPI_DEBUG_PRINT((ACPI_DB_WARN,
				  "**** Warning **** Large Reference Count (%X) in object %p\n\n",
				  count, object));
	}

	return;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_update_object_reference
 *
 * PARAMETERS:  Object              - Increment ref count for this object
 *                                    and all sub-objects
 *              Action              - Either REF_INCREMENT or REF_DECREMENT or
 *                                    REF_FORCE_DELETE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Increment the object reference count
 *
 * Object references are incremented when:
 * 1) An object is attached to a Node (namespace object)
 * 2) An object is copied (all subobjects must be incremented)
 *
 * Object references are decremented when:
 * 1) An object is detached from an Node
 *
 ******************************************************************************/

acpi_status
acpi_ut_update_object_reference(union acpi_operand_object * object, u16 action)
{
	acpi_status status = AE_OK;
	union acpi_generic_state *state_list = NULL;
	union acpi_operand_object *next_object = NULL;
	union acpi_generic_state *state;
	acpi_native_uint i;

	ACPI_FUNCTION_TRACE_PTR("ut_update_object_reference", object);

	while (object) {
		/* Make sure that this isn't a namespace handle */

		if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Object %p is NS handle\n", object));
			return_ACPI_STATUS(AE_OK);
		}

		/*
		 * All sub-objects must have their reference count incremented also.
		 * Different object types have different subobjects.
		 */
		switch (ACPI_GET_OBJECT_TYPE(object)) {
		case ACPI_TYPE_DEVICE:

			acpi_ut_update_ref_count(object->device.system_notify,
						 action);
			acpi_ut_update_ref_count(object->device.device_notify,
						 action);
			break;

		case ACPI_TYPE_PACKAGE:
			/*
			 * We must update all the sub-objects of the package,
			 * each of whom may have their own sub-objects.
			 */
			for (i = 0; i < object->package.count; i++) {
				/*
				 * Push each element onto the stack for later processing.
				 * Note: There can be null elements within the package,
				 * these are simply ignored
				 */
				status =
				    acpi_ut_create_update_state_and_push
				    (object->package.elements[i], action,
				     &state_list);
				if (ACPI_FAILURE(status)) {
					goto error_exit;
				}
			}
			break;

		case ACPI_TYPE_BUFFER_FIELD:

			next_object = object->buffer_field.buffer_obj;
			break;

		case ACPI_TYPE_LOCAL_REGION_FIELD:

			next_object = object->field.region_obj;
			break;

		case ACPI_TYPE_LOCAL_BANK_FIELD:

			next_object = object->bank_field.bank_obj;
			status =
			    acpi_ut_create_update_state_and_push(object->
								 bank_field.
								 region_obj,
								 action,
								 &state_list);
			if (ACPI_FAILURE(status)) {
				goto error_exit;
			}
			break;

		case ACPI_TYPE_LOCAL_INDEX_FIELD:

			next_object = object->index_field.index_obj;
			status =
			    acpi_ut_create_update_state_and_push(object->
								 index_field.
								 data_obj,
								 action,
								 &state_list);
			if (ACPI_FAILURE(status)) {
				goto error_exit;
			}
			break;

		case ACPI_TYPE_LOCAL_REFERENCE:
			/*
			 * The target of an Index (a package, string, or buffer) must track
			 * changes to the ref count of the index.
			 */
			if (object->reference.opcode == AML_INDEX_OP) {
				next_object = object->reference.object;
			}
			break;

		case ACPI_TYPE_REGION:
		default:
			break;	/* No subobjects */
		}

		/*
		 * Now we can update the count in the main object.  This can only
		 * happen after we update the sub-objects in case this causes the
		 * main object to be deleted.
		 */
		acpi_ut_update_ref_count(object, action);
		object = NULL;

		/* Move on to the next object to be updated */

		if (next_object) {
			object = next_object;
			next_object = NULL;
		} else if (state_list) {
			state = acpi_ut_pop_generic_state(&state_list);
			object = state->update.object;
			acpi_ut_delete_generic_state(state);
		}
	}

	return_ACPI_STATUS(AE_OK);

      error_exit:

	ACPI_REPORT_ERROR(("Could not update object reference count, %s\n",
			   acpi_format_exception(status)));

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_add_reference
 *
 * PARAMETERS:  Object          - Object whose reference count is to be
 *                                incremented
 *
 * RETURN:      None
 *
 * DESCRIPTION: Add one reference to an ACPI object
 *
 ******************************************************************************/

void acpi_ut_add_reference(union acpi_operand_object *object)
{

	ACPI_FUNCTION_TRACE_PTR("ut_add_reference", object);

	/* Ensure that we have a valid object */

	if (!acpi_ut_valid_internal_object(object)) {
		return_VOID;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
			  "Obj %p Current Refs=%X [To Be Incremented]\n",
			  object, object->common.reference_count));

	/* Increment the reference count */

	(void)acpi_ut_update_object_reference(object, REF_INCREMENT);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_remove_reference
 *
 * PARAMETERS:  Object         - Object whose ref count will be decremented
 *
 * RETURN:      None
 *
 * DESCRIPTION: Decrement the reference count of an ACPI internal object
 *
 ******************************************************************************/

void acpi_ut_remove_reference(union acpi_operand_object *object)
{

	ACPI_FUNCTION_TRACE_PTR("ut_remove_reference", object);

	/*
	 * Allow a NULL pointer to be passed in, just ignore it.  This saves
	 * each caller from having to check.  Also, ignore NS nodes.
	 *
	 */
	if (!object ||
	    (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
		return_VOID;
	}

	/* Ensure that we have a valid object */

	if (!acpi_ut_valid_internal_object(object)) {
		return_VOID;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
			  "Obj %p Current Refs=%X [To Be Decremented]\n",
			  object, object->common.reference_count));

	/*
	 * Decrement the reference count, and only actually delete the object
	 * if the reference count becomes 0.  (Must also decrement the ref count
	 * of all subobjects!)
	 */
	(void)acpi_ut_update_object_reference(object, REF_DECREMENT);
	return_VOID;
}