1 /*******************************************************************************
2 *
3 * Module Name: nseval - Object evaluation, includes control method execution
4 *
5 ******************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65
66 *
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3.4. Intel retains all right, title, and interest in and to the Original
74 * Intel Code.
75 *
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
80 *
81 * 4. Disclaimer and Export Compliance
82 *
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
89 * PARTICULAR PURPOSE.
90 *
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
98 * LIMITED REMEDY.
99 *
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
114 *
115 *****************************************************************************
116 *
117 * Alternatively, you may choose to be licensed under the terms of the
118 * following license:
119 *
120 * Redistribution and use in source and binary forms, with or without
121 * modification, are permitted provided that the following conditions
122 * are met:
123 * 1. Redistributions of source code must retain the above copyright
124 * notice, this list of conditions, and the following disclaimer,
125 * without modification.
126 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
127 * substantially similar to the "NO WARRANTY" disclaimer below
128 * ("Disclaimer") and any redistribution must be conditioned upon
129 * including a substantially similar Disclaimer requirement for further
130 * binary redistribution.
131 * 3. Neither the names of the above-listed copyright holders nor the names
132 * of any contributors may be used to endorse or promote products derived
133 * from this software without specific prior written permission.
134 *
135 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
136 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
137 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
138 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
139 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
140 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
141 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
142 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
143 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
144 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
145 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146 *
147 * Alternatively, you may choose to be licensed under the terms of the
148 * GNU General Public License ("GPL") version 2 as published by the Free
149 * Software Foundation.
150 *
151 *****************************************************************************/
152
153 #include "acpi.h"
154 #include "accommon.h"
155 #include "acparser.h"
156 #include "acinterp.h"
157 #include "acnamesp.h"
158
159
160 #define _COMPONENT ACPI_NAMESPACE
161 ACPI_MODULE_NAME ("nseval")
162
163 /* Local prototypes */
164
165 static void
166 AcpiNsExecModuleCode (
167 ACPI_OPERAND_OBJECT *MethodObj,
168 ACPI_EVALUATE_INFO *Info);
169
170
171 /*******************************************************************************
172 *
173 * FUNCTION: AcpiNsEvaluate
174 *
175 * PARAMETERS: Info - Evaluation info block, contains these fields
176 * and more:
177 * PrefixNode - Prefix or Method/Object Node to execute
178 * RelativePath - Name of method to execute, If NULL, the
179 * Node is the object to execute
180 * Parameters - List of parameters to pass to the method,
181 * terminated by NULL. Params itself may be
182 * NULL if no parameters are being passed.
183 * ParameterType - Type of Parameter list
184 * ReturnObject - Where to put method's return value (if
185 * any). If NULL, no value is returned.
186 * Flags - ACPI_IGNORE_RETURN_VALUE to delete return
187 *
188 * RETURN: Status
189 *
190 * DESCRIPTION: Execute a control method or return the current value of an
191 * ACPI namespace object.
192 *
193 * MUTEX: Locks interpreter
194 *
195 ******************************************************************************/
196
197 ACPI_STATUS
AcpiNsEvaluate(ACPI_EVALUATE_INFO * Info)198 AcpiNsEvaluate (
199 ACPI_EVALUATE_INFO *Info)
200 {
201 ACPI_STATUS Status;
202
203
204 ACPI_FUNCTION_TRACE (NsEvaluate);
205
206
207 if (!Info)
208 {
209 return_ACPI_STATUS (AE_BAD_PARAMETER);
210 }
211
212 if (!Info->Node)
213 {
214 /*
215 * Get the actual namespace node for the target object if we
216 * need to. Handles these cases:
217 *
218 * 1) Null node, valid pathname from root (absolute path)
219 * 2) Node and valid pathname (path relative to Node)
220 * 3) Node, Null pathname
221 */
222 Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
223 ACPI_NS_NO_UPSEARCH, &Info->Node);
224 if (ACPI_FAILURE (Status))
225 {
226 return_ACPI_STATUS (Status);
227 }
228 }
229
230 /*
231 * For a method alias, we must grab the actual method node so that
232 * proper scoping context will be established before execution.
233 */
234 if (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
235 {
236 Info->Node = ACPI_CAST_PTR (
237 ACPI_NAMESPACE_NODE, Info->Node->Object);
238 }
239
240 /* Complete the info block initialization */
241
242 Info->ReturnObject = NULL;
243 Info->NodeFlags = Info->Node->Flags;
244 Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
245
246 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
247 Info->RelativePathname, Info->Node,
248 AcpiNsGetAttachedObject (Info->Node)));
249
250 /* Get info if we have a predefined name (_HID, etc.) */
251
252 Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);
253
254 /* Get the full pathname to the object, for use in warning messages */
255
256 Info->FullPathname = AcpiNsGetNormalizedPathname (Info->Node, TRUE);
257 if (!Info->FullPathname)
258 {
259 return_ACPI_STATUS (AE_NO_MEMORY);
260 }
261
262 /* Count the number of arguments being passed in */
263
264 Info->ParamCount = 0;
265 if (Info->Parameters)
266 {
267 while (Info->Parameters[Info->ParamCount])
268 {
269 Info->ParamCount++;
270 }
271
272 /* Warn on impossible argument count */
273
274 if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
275 {
276 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
277 "Excess arguments (%u) - using only %u",
278 Info->ParamCount, ACPI_METHOD_NUM_ARGS));
279
280 Info->ParamCount = ACPI_METHOD_NUM_ARGS;
281 }
282 }
283
284 /*
285 * For predefined names: Check that the declared argument count
286 * matches the ACPI spec -- otherwise this is a BIOS error.
287 */
288 AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
289 Info->Predefined);
290
291 /*
292 * For all names: Check that the incoming argument count for
293 * this method/object matches the actual ASL/AML definition.
294 */
295 AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
296 Info->ParamCount, Info->Predefined);
297
298 /* For predefined names: Typecheck all incoming arguments */
299
300 AcpiNsCheckArgumentTypes (Info);
301
302 /*
303 * Three major evaluation cases:
304 *
305 * 1) Object types that cannot be evaluated by definition
306 * 2) The object is a control method -- execute it
307 * 3) The object is not a method -- just return it's current value
308 */
309 switch (AcpiNsGetType (Info->Node))
310 {
311 case ACPI_TYPE_ANY:
312 case ACPI_TYPE_DEVICE:
313 case ACPI_TYPE_EVENT:
314 case ACPI_TYPE_MUTEX:
315 case ACPI_TYPE_REGION:
316 case ACPI_TYPE_THERMAL:
317 case ACPI_TYPE_LOCAL_SCOPE:
318 /*
319 * 1) Disallow evaluation of these object types. For these,
320 * object evaluation is undefined.
321 */
322 ACPI_ERROR ((AE_INFO,
323 "%s: This object type [%s] "
324 "never contains data and cannot be evaluated",
325 Info->FullPathname, AcpiUtGetTypeName (Info->Node->Type)));
326
327 Status = AE_TYPE;
328 goto Cleanup;
329
330 case ACPI_TYPE_METHOD:
331 /*
332 * 2) Object is a control method - execute it
333 */
334
335 /* Verify that there is a method object associated with this node */
336
337 if (!Info->ObjDesc)
338 {
339 ACPI_ERROR ((AE_INFO, "%s: Method has no attached sub-object",
340 Info->FullPathname));
341 Status = AE_NULL_OBJECT;
342 goto Cleanup;
343 }
344
345 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
346 "**** Execute method [%s] at AML address %p length %X\n",
347 Info->FullPathname,
348 Info->ObjDesc->Method.AmlStart + 1,
349 Info->ObjDesc->Method.AmlLength - 1));
350
351 /*
352 * Any namespace deletion must acquire both the namespace and
353 * interpreter locks to ensure that no thread is using the portion of
354 * the namespace that is being deleted.
355 *
356 * Execute the method via the interpreter. The interpreter is locked
357 * here before calling into the AML parser
358 */
359 AcpiExEnterInterpreter ();
360 Status = AcpiPsExecuteMethod (Info);
361 AcpiExExitInterpreter ();
362 break;
363
364 default:
365 /*
366 * 3) All other non-method objects -- get the current object value
367 */
368
369 /*
370 * Some objects require additional resolution steps (e.g., the Node
371 * may be a field that must be read, etc.) -- we can't just grab
372 * the object out of the node.
373 *
374 * Use ResolveNodeToValue() to get the associated value.
375 *
376 * NOTE: we can get away with passing in NULL for a walk state because
377 * the Node is guaranteed to not be a reference to either a method
378 * local or a method argument (because this interface is never called
379 * from a running method.)
380 *
381 * Even though we do not directly invoke the interpreter for object
382 * resolution, we must lock it because we could access an OpRegion.
383 * The OpRegion access code assumes that the interpreter is locked.
384 */
385 AcpiExEnterInterpreter ();
386
387 /* TBD: ResolveNodeToValue has a strange interface, fix */
388
389 Info->ReturnObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->Node);
390
391 Status = AcpiExResolveNodeToValue (ACPI_CAST_INDIRECT_PTR (
392 ACPI_NAMESPACE_NODE, &Info->ReturnObject), NULL);
393 AcpiExExitInterpreter ();
394
395 if (ACPI_FAILURE (Status))
396 {
397 Info->ReturnObject = NULL;
398 goto Cleanup;
399 }
400
401 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returned object %p [%s]\n",
402 Info->ReturnObject,
403 AcpiUtGetObjectTypeName (Info->ReturnObject)));
404
405 Status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
406 break;
407 }
408
409 /*
410 * For predefined names, check the return value against the ACPI
411 * specification. Some incorrect return value types are repaired.
412 */
413 (void) AcpiNsCheckReturnValue (Info->Node, Info, Info->ParamCount,
414 Status, &Info->ReturnObject);
415
416 /* Check if there is a return value that must be dealt with */
417
418 if (Status == AE_CTRL_RETURN_VALUE)
419 {
420 /* If caller does not want the return value, delete it */
421
422 if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
423 {
424 AcpiUtRemoveReference (Info->ReturnObject);
425 Info->ReturnObject = NULL;
426 }
427
428 /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
429
430 Status = AE_OK;
431 }
432 else if (ACPI_FAILURE(Status))
433 {
434 /* If ReturnObject exists, delete it */
435
436 if (Info->ReturnObject)
437 {
438 AcpiUtRemoveReference (Info->ReturnObject);
439 Info->ReturnObject = NULL;
440 }
441 }
442
443 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
444 "*** Completed evaluation of object %s ***\n",
445 Info->RelativePathname));
446
447 Cleanup:
448 /*
449 * Namespace was unlocked by the handling AcpiNs* function, so we
450 * just free the pathname and return
451 */
452 ACPI_FREE (Info->FullPathname);
453 Info->FullPathname = NULL;
454 return_ACPI_STATUS (Status);
455 }
456
457
458 /*******************************************************************************
459 *
460 * FUNCTION: AcpiNsExecModuleCodeList
461 *
462 * PARAMETERS: None
463 *
464 * RETURN: None. Exceptions during method execution are ignored, since
465 * we cannot abort a table load.
466 *
467 * DESCRIPTION: Execute all elements of the global module-level code list.
468 * Each element is executed as a single control method.
469 *
470 * NOTE: With this option enabled, each block of detected executable AML
471 * code that is outside of any control method is wrapped with a temporary
472 * control method object and placed on a global list. The methods on this
473 * list are executed below.
474 *
475 * This function executes the module-level code for all tables only after
476 * all of the tables have been loaded. It is a legacy option and is
477 * not compatible with other ACPI implementations. See AcpiNsLoadTable.
478 *
479 * This function will be removed when the legacy option is removed.
480 *
481 ******************************************************************************/
482
483 void
AcpiNsExecModuleCodeList(void)484 AcpiNsExecModuleCodeList (
485 void)
486 {
487 ACPI_OPERAND_OBJECT *Prev;
488 ACPI_OPERAND_OBJECT *Next;
489 ACPI_EVALUATE_INFO *Info;
490 UINT32 MethodCount = 0;
491
492
493 ACPI_FUNCTION_TRACE (NsExecModuleCodeList);
494
495
496 /* Exit now if the list is empty */
497
498 Next = AcpiGbl_ModuleCodeList;
499 if (!Next)
500 {
501 ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
502 "Legacy MLC block list is empty\n"));
503
504 return_VOID;
505 }
506
507 /* Allocate the evaluation information block */
508
509 Info = ACPI_ALLOCATE (sizeof (ACPI_EVALUATE_INFO));
510 if (!Info)
511 {
512 return_VOID;
513 }
514
515 /* Walk the list, executing each "method" */
516
517 while (Next)
518 {
519 Prev = Next;
520 Next = Next->Method.Mutex;
521
522 /* Clear the link field and execute the method */
523
524 Prev->Method.Mutex = NULL;
525 AcpiNsExecModuleCode (Prev, Info);
526 MethodCount++;
527
528 /* Delete the (temporary) method object */
529
530 AcpiUtRemoveReference (Prev);
531 }
532
533 ACPI_INFO ((
534 "Executed %u blocks of module-level executable AML code",
535 MethodCount));
536
537 ACPI_FREE (Info);
538 AcpiGbl_ModuleCodeList = NULL;
539 return_VOID;
540 }
541
542
543 /*******************************************************************************
544 *
545 * FUNCTION: AcpiNsExecModuleCode
546 *
547 * PARAMETERS: MethodObj - Object container for the module-level code
548 * Info - Info block for method evaluation
549 *
550 * RETURN: None. Exceptions during method execution are ignored, since
551 * we cannot abort a table load.
552 *
553 * DESCRIPTION: Execute a control method containing a block of module-level
554 * executable AML code. The control method is temporarily
555 * installed to the root node, then evaluated.
556 *
557 ******************************************************************************/
558
559 static void
AcpiNsExecModuleCode(ACPI_OPERAND_OBJECT * MethodObj,ACPI_EVALUATE_INFO * Info)560 AcpiNsExecModuleCode (
561 ACPI_OPERAND_OBJECT *MethodObj,
562 ACPI_EVALUATE_INFO *Info)
563 {
564 ACPI_OPERAND_OBJECT *ParentObj;
565 ACPI_NAMESPACE_NODE *ParentNode;
566 ACPI_OBJECT_TYPE Type;
567 ACPI_STATUS Status;
568
569
570 ACPI_FUNCTION_TRACE (NsExecModuleCode);
571
572
573 /*
574 * Get the parent node. We cheat by using the NextObject field
575 * of the method object descriptor.
576 */
577 ParentNode = ACPI_CAST_PTR (
578 ACPI_NAMESPACE_NODE, MethodObj->Method.NextObject);
579 Type = AcpiNsGetType (ParentNode);
580
581 /*
582 * Get the region handler and save it in the method object. We may need
583 * this if an operation region declaration causes a _REG method to be run.
584 *
585 * We can't do this in AcpiPsLinkModuleCode because
586 * AcpiGbl_RootNode->Object is NULL at PASS1.
587 */
588 if ((Type == ACPI_TYPE_DEVICE) && ParentNode->Object)
589 {
590 MethodObj->Method.Dispatch.Handler =
591 ParentNode->Object->Device.Handler;
592 }
593
594 /* Must clear NextObject (AcpiNsAttachObject needs the field) */
595
596 MethodObj->Method.NextObject = NULL;
597
598 /* Initialize the evaluation information block */
599
600 memset (Info, 0, sizeof (ACPI_EVALUATE_INFO));
601 Info->PrefixNode = ParentNode;
602
603 /*
604 * Get the currently attached parent object. Add a reference,
605 * because the ref count will be decreased when the method object
606 * is installed to the parent node.
607 */
608 ParentObj = AcpiNsGetAttachedObject (ParentNode);
609 if (ParentObj)
610 {
611 AcpiUtAddReference (ParentObj);
612 }
613
614 /* Install the method (module-level code) in the parent node */
615
616 Status = AcpiNsAttachObject (ParentNode, MethodObj, ACPI_TYPE_METHOD);
617 if (ACPI_FAILURE (Status))
618 {
619 goto Exit;
620 }
621
622 /* Execute the parent node as a control method */
623
624 Status = AcpiNsEvaluate (Info);
625
626 ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
627 "Executed module-level code at %p\n",
628 MethodObj->Method.AmlStart));
629
630 /* Delete a possible implicit return value (in slack mode) */
631
632 if (Info->ReturnObject)
633 {
634 AcpiUtRemoveReference (Info->ReturnObject);
635 }
636
637 /* Detach the temporary method object */
638
639 AcpiNsDetachObject (ParentNode);
640
641 /* Restore the original parent object */
642
643 if (ParentObj)
644 {
645 Status = AcpiNsAttachObject (ParentNode, ParentObj, Type);
646 }
647 else
648 {
649 ParentNode->Type = (UINT8) Type;
650 }
651
652 Exit:
653 if (ParentObj)
654 {
655 AcpiUtRemoveReference (ParentObj);
656 }
657 return_VOID;
658 }
659