Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / dswstate.c
1 /******************************************************************************
2  *
3  * Module Name: dswstate - Dispatcher parse tree walk management routines
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acparser.h"
47 #include "acdispat.h"
48 #include "acnamesp.h"
49
50 #define _COMPONENT          ACPI_DISPATCHER
51 ACPI_MODULE_NAME("dswstate")
52
53   /* Local prototypes */
54 static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *ws);
55 static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *ws);
56
57 /*******************************************************************************
58  *
59  * FUNCTION:    acpi_ds_result_pop
60  *
61  * PARAMETERS:  Object              - Where to return the popped object
62  *              walk_state          - Current Walk state
63  *
64  * RETURN:      Status
65  *
66  * DESCRIPTION: Pop an object off the top of this walk's result stack
67  *
68  ******************************************************************************/
69
70 acpi_status
71 acpi_ds_result_pop(union acpi_operand_object **object,
72                    struct acpi_walk_state *walk_state)
73 {
74         u32 index;
75         union acpi_generic_state *state;
76         acpi_status status;
77
78         ACPI_FUNCTION_NAME(ds_result_pop);
79
80         state = walk_state->results;
81
82         /* Incorrect state of result stack */
83
84         if (state && !walk_state->result_count) {
85                 ACPI_ERROR((AE_INFO, "No results on result stack"));
86                 return (AE_AML_INTERNAL);
87         }
88
89         if (!state && walk_state->result_count) {
90                 ACPI_ERROR((AE_INFO, "No result state for result stack"));
91                 return (AE_AML_INTERNAL);
92         }
93
94         /* Empty result stack */
95
96         if (!state) {
97                 ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
98                             walk_state));
99                 return (AE_AML_NO_RETURN_VALUE);
100         }
101
102         /* Return object of the top element and clean that top element result stack */
103
104         walk_state->result_count--;
105         index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
106
107         *object = state->results.obj_desc[index];
108         if (!*object) {
109                 ACPI_ERROR((AE_INFO,
110                             "No result objects on result stack, State=%p",
111                             walk_state));
112                 return (AE_AML_NO_RETURN_VALUE);
113         }
114
115         state->results.obj_desc[index] = NULL;
116         if (index == 0) {
117                 status = acpi_ds_result_stack_pop(walk_state);
118                 if (ACPI_FAILURE(status)) {
119                         return (status);
120                 }
121         }
122
123         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
124                           "Obj=%p [%s] Index=%X State=%p Num=%X\n", *object,
125                           acpi_ut_get_object_type_name(*object),
126                           index, walk_state, walk_state->result_count));
127
128         return (AE_OK);
129 }
130
131 /*******************************************************************************
132  *
133  * FUNCTION:    acpi_ds_result_push
134  *
135  * PARAMETERS:  Object              - Where to return the popped object
136  *              walk_state          - Current Walk state
137  *
138  * RETURN:      Status
139  *
140  * DESCRIPTION: Push an object onto the current result stack
141  *
142  ******************************************************************************/
143
144 acpi_status
145 acpi_ds_result_push(union acpi_operand_object * object,
146                     struct acpi_walk_state * walk_state)
147 {
148         union acpi_generic_state *state;
149         acpi_status status;
150         u32 index;
151
152         ACPI_FUNCTION_NAME(ds_result_push);
153
154         if (walk_state->result_count > walk_state->result_size) {
155                 ACPI_ERROR((AE_INFO, "Result stack is full"));
156                 return (AE_AML_INTERNAL);
157         } else if (walk_state->result_count == walk_state->result_size) {
158
159                 /* Extend the result stack */
160
161                 status = acpi_ds_result_stack_push(walk_state);
162                 if (ACPI_FAILURE(status)) {
163                         ACPI_ERROR((AE_INFO,
164                                     "Failed to extend the result stack"));
165                         return (status);
166                 }
167         }
168
169         if (!(walk_state->result_count < walk_state->result_size)) {
170                 ACPI_ERROR((AE_INFO, "No free elements in result stack"));
171                 return (AE_AML_INTERNAL);
172         }
173
174         state = walk_state->results;
175         if (!state) {
176                 ACPI_ERROR((AE_INFO, "No result stack frame during push"));
177                 return (AE_AML_INTERNAL);
178         }
179
180         if (!object) {
181                 ACPI_ERROR((AE_INFO,
182                             "Null Object! Obj=%p State=%p Num=%u",
183                             object, walk_state, walk_state->result_count));
184                 return (AE_BAD_PARAMETER);
185         }
186
187         /* Assign the address of object to the top free element of result stack */
188
189         index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
190         state->results.obj_desc[index] = object;
191         walk_state->result_count++;
192
193         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
194                           object,
195                           acpi_ut_get_object_type_name((union
196                                                         acpi_operand_object *)
197                                                        object), walk_state,
198                           walk_state->result_count,
199                           walk_state->current_result));
200
201         return (AE_OK);
202 }
203
204 /*******************************************************************************
205  *
206  * FUNCTION:    acpi_ds_result_stack_push
207  *
208  * PARAMETERS:  walk_state          - Current Walk state
209  *
210  * RETURN:      Status
211  *
212  * DESCRIPTION: Push an object onto the walk_state result stack
213  *
214  ******************************************************************************/
215
216 static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *walk_state)
217 {
218         union acpi_generic_state *state;
219
220         ACPI_FUNCTION_NAME(ds_result_stack_push);
221
222         /* Check for stack overflow */
223
224         if (((u32) walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) >
225             ACPI_RESULTS_OBJ_NUM_MAX) {
226                 ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%u",
227                             walk_state, walk_state->result_size));
228                 return (AE_STACK_OVERFLOW);
229         }
230
231         state = acpi_ut_create_generic_state();
232         if (!state) {
233                 return (AE_NO_MEMORY);
234         }
235
236         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT;
237         acpi_ut_push_generic_state(&walk_state->results, state);
238
239         /* Increase the length of the result stack by the length of frame */
240
241         walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM;
242
243         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n",
244                           state, walk_state));
245
246         return (AE_OK);
247 }
248
249 /*******************************************************************************
250  *
251  * FUNCTION:    acpi_ds_result_stack_pop
252  *
253  * PARAMETERS:  walk_state          - Current Walk state
254  *
255  * RETURN:      Status
256  *
257  * DESCRIPTION: Pop an object off of the walk_state result stack
258  *
259  ******************************************************************************/
260
261 static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state)
262 {
263         union acpi_generic_state *state;
264
265         ACPI_FUNCTION_NAME(ds_result_stack_pop);
266
267         /* Check for stack underflow */
268
269         if (walk_state->results == NULL) {
270                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
271                                   "Result stack underflow - State=%p\n",
272                                   walk_state));
273                 return (AE_AML_NO_OPERAND);
274         }
275
276         if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) {
277                 ACPI_ERROR((AE_INFO, "Insufficient result stack size"));
278                 return (AE_AML_INTERNAL);
279         }
280
281         state = acpi_ut_pop_generic_state(&walk_state->results);
282         acpi_ut_delete_generic_state(state);
283
284         /* Decrease the length of result stack by the length of frame */
285
286         walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM;
287
288         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
289                           "Result=%p RemainingResults=%X State=%p\n",
290                           state, walk_state->result_count, walk_state));
291
292         return (AE_OK);
293 }
294
295 /*******************************************************************************
296  *
297  * FUNCTION:    acpi_ds_obj_stack_push
298  *
299  * PARAMETERS:  Object              - Object to push
300  *              walk_state          - Current Walk state
301  *
302  * RETURN:      Status
303  *
304  * DESCRIPTION: Push an object onto this walk's object/operand stack
305  *
306  ******************************************************************************/
307
308 acpi_status
309 acpi_ds_obj_stack_push(void *object, struct acpi_walk_state * walk_state)
310 {
311         ACPI_FUNCTION_NAME(ds_obj_stack_push);
312
313         /* Check for stack overflow */
314
315         if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
316                 ACPI_ERROR((AE_INFO,
317                             "Object stack overflow! Obj=%p State=%p #Ops=%u",
318                             object, walk_state, walk_state->num_operands));
319                 return (AE_STACK_OVERFLOW);
320         }
321
322         /* Put the object onto the stack */
323
324         walk_state->operands[walk_state->operand_index] = object;
325         walk_state->num_operands++;
326
327         /* For the usual order of filling the operand stack */
328
329         walk_state->operand_index++;
330
331         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
332                           object,
333                           acpi_ut_get_object_type_name((union
334                                                         acpi_operand_object *)
335                                                        object), walk_state,
336                           walk_state->num_operands));
337
338         return (AE_OK);
339 }
340
341 /*******************************************************************************
342  *
343  * FUNCTION:    acpi_ds_obj_stack_pop
344  *
345  * PARAMETERS:  pop_count           - Number of objects/entries to pop
346  *              walk_state          - Current Walk state
347  *
348  * RETURN:      Status
349  *
350  * DESCRIPTION: Pop this walk's object stack.  Objects on the stack are NOT
351  *              deleted by this routine.
352  *
353  ******************************************************************************/
354
355 acpi_status
356 acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state * walk_state)
357 {
358         u32 i;
359
360         ACPI_FUNCTION_NAME(ds_obj_stack_pop);
361
362         for (i = 0; i < pop_count; i++) {
363
364                 /* Check for stack underflow */
365
366                 if (walk_state->num_operands == 0) {
367                         ACPI_ERROR((AE_INFO,
368                                     "Object stack underflow! Count=%X State=%p #Ops=%u",
369                                     pop_count, walk_state,
370                                     walk_state->num_operands));
371                         return (AE_STACK_UNDERFLOW);
372                 }
373
374                 /* Just set the stack entry to null */
375
376                 walk_state->num_operands--;
377                 walk_state->operands[walk_state->num_operands] = NULL;
378         }
379
380         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n",
381                           pop_count, walk_state, walk_state->num_operands));
382
383         return (AE_OK);
384 }
385
386 /*******************************************************************************
387  *
388  * FUNCTION:    acpi_ds_obj_stack_pop_and_delete
389  *
390  * PARAMETERS:  pop_count           - Number of objects/entries to pop
391  *              walk_state          - Current Walk state
392  *
393  * RETURN:      Status
394  *
395  * DESCRIPTION: Pop this walk's object stack and delete each object that is
396  *              popped off.
397  *
398  ******************************************************************************/
399
400 void
401 acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
402                                  struct acpi_walk_state *walk_state)
403 {
404         s32 i;
405         union acpi_operand_object *obj_desc;
406
407         ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete);
408
409         if (pop_count == 0) {
410                 return;
411         }
412
413         for (i = (s32) pop_count - 1; i >= 0; i--) {
414                 if (walk_state->num_operands == 0) {
415                         return;
416                 }
417
418                 /* Pop the stack and delete an object if present in this stack entry */
419
420                 walk_state->num_operands--;
421                 obj_desc = walk_state->operands[i];
422                 if (obj_desc) {
423                         acpi_ut_remove_reference(walk_state->operands[i]);
424                         walk_state->operands[i] = NULL;
425                 }
426         }
427
428         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
429                           pop_count, walk_state, walk_state->num_operands));
430 }
431
432 /*******************************************************************************
433  *
434  * FUNCTION:    acpi_ds_get_current_walk_state
435  *
436  * PARAMETERS:  Thread          - Get current active state for this Thread
437  *
438  * RETURN:      Pointer to the current walk state
439  *
440  * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
441  *              walk state.)
442  *
443  ******************************************************************************/
444
445 struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state
446                                                        *thread)
447 {
448         ACPI_FUNCTION_NAME(ds_get_current_walk_state);
449
450         if (!thread) {
451                 return (NULL);
452         }
453
454         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current WalkState %p\n",
455                           thread->walk_state_list));
456
457         return (thread->walk_state_list);
458 }
459
460 /*******************************************************************************
461  *
462  * FUNCTION:    acpi_ds_push_walk_state
463  *
464  * PARAMETERS:  walk_state      - State to push
465  *              Thread          - Thread state object
466  *
467  * RETURN:      None
468  *
469  * DESCRIPTION: Place the Thread state at the head of the state list
470  *
471  ******************************************************************************/
472
473 void
474 acpi_ds_push_walk_state(struct acpi_walk_state *walk_state,
475                         struct acpi_thread_state *thread)
476 {
477         ACPI_FUNCTION_TRACE(ds_push_walk_state);
478
479         walk_state->next = thread->walk_state_list;
480         thread->walk_state_list = walk_state;
481
482         return_VOID;
483 }
484
485 /*******************************************************************************
486  *
487  * FUNCTION:    acpi_ds_pop_walk_state
488  *
489  * PARAMETERS:  Thread      - Current thread state
490  *
491  * RETURN:      A walk_state object popped from the thread's stack
492  *
493  * DESCRIPTION: Remove and return the walkstate object that is at the head of
494  *              the walk stack for the given walk list.  NULL indicates that
495  *              the list is empty.
496  *
497  ******************************************************************************/
498
499 struct acpi_walk_state *acpi_ds_pop_walk_state(struct acpi_thread_state *thread)
500 {
501         struct acpi_walk_state *walk_state;
502
503         ACPI_FUNCTION_TRACE(ds_pop_walk_state);
504
505         walk_state = thread->walk_state_list;
506
507         if (walk_state) {
508
509                 /* Next walk state becomes the current walk state */
510
511                 thread->walk_state_list = walk_state->next;
512
513                 /*
514                  * Don't clear the NEXT field, this serves as an indicator
515                  * that there is a parent WALK STATE
516                  * Do Not: walk_state->Next = NULL;
517                  */
518         }
519
520         return_PTR(walk_state);
521 }
522
523 /*******************************************************************************
524  *
525  * FUNCTION:    acpi_ds_create_walk_state
526  *
527  * PARAMETERS:  owner_id        - ID for object creation
528  *              Origin          - Starting point for this walk
529  *              method_desc     - Method object
530  *              Thread          - Current thread state
531  *
532  * RETURN:      Pointer to the new walk state.
533  *
534  * DESCRIPTION: Allocate and initialize a new walk state.  The current walk
535  *              state is set to this new state.
536  *
537  ******************************************************************************/
538
539 struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id, union acpi_parse_object
540                                                   *origin, union acpi_operand_object
541                                                   *method_desc, struct acpi_thread_state
542                                                   *thread)
543 {
544         struct acpi_walk_state *walk_state;
545
546         ACPI_FUNCTION_TRACE(ds_create_walk_state);
547
548         walk_state = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_walk_state));
549         if (!walk_state) {
550                 return_PTR(NULL);
551         }
552
553         walk_state->descriptor_type = ACPI_DESC_TYPE_WALK;
554         walk_state->method_desc = method_desc;
555         walk_state->owner_id = owner_id;
556         walk_state->origin = origin;
557         walk_state->thread = thread;
558
559         walk_state->parser_state.start_op = origin;
560
561         /* Init the method args/local */
562
563 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
564         acpi_ds_method_data_init(walk_state);
565 #endif
566
567         /* Put the new state at the head of the walk list */
568
569         if (thread) {
570                 acpi_ds_push_walk_state(walk_state, thread);
571         }
572
573         return_PTR(walk_state);
574 }
575
576 /*******************************************************************************
577  *
578  * FUNCTION:    acpi_ds_init_aml_walk
579  *
580  * PARAMETERS:  walk_state      - New state to be initialized
581  *              Op              - Current parse op
582  *              method_node     - Control method NS node, if any
583  *              aml_start       - Start of AML
584  *              aml_length      - Length of AML
585  *              Info            - Method info block (params, etc.)
586  *              pass_number     - 1, 2, or 3
587  *
588  * RETURN:      Status
589  *
590  * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
591  *
592  ******************************************************************************/
593
594 acpi_status
595 acpi_ds_init_aml_walk(struct acpi_walk_state *walk_state,
596                       union acpi_parse_object *op,
597                       struct acpi_namespace_node *method_node,
598                       u8 * aml_start,
599                       u32 aml_length,
600                       struct acpi_evaluate_info *info, u8 pass_number)
601 {
602         acpi_status status;
603         struct acpi_parse_state *parser_state = &walk_state->parser_state;
604         union acpi_parse_object *extra_op;
605
606         ACPI_FUNCTION_TRACE(ds_init_aml_walk);
607
608         walk_state->parser_state.aml =
609             walk_state->parser_state.aml_start = aml_start;
610         walk_state->parser_state.aml_end =
611             walk_state->parser_state.pkg_end = aml_start + aml_length;
612
613         /* The next_op of the next_walk will be the beginning of the method */
614
615         walk_state->next_op = NULL;
616         walk_state->pass_number = pass_number;
617
618         if (info) {
619                 walk_state->params = info->parameters;
620                 walk_state->caller_return_desc = &info->return_object;
621         }
622
623         status = acpi_ps_init_scope(&walk_state->parser_state, op);
624         if (ACPI_FAILURE(status)) {
625                 return_ACPI_STATUS(status);
626         }
627
628         if (method_node) {
629                 walk_state->parser_state.start_node = method_node;
630                 walk_state->walk_type = ACPI_WALK_METHOD;
631                 walk_state->method_node = method_node;
632                 walk_state->method_desc =
633                     acpi_ns_get_attached_object(method_node);
634
635                 /* Push start scope on scope stack and make it current  */
636
637                 status =
638                     acpi_ds_scope_stack_push(method_node, ACPI_TYPE_METHOD,
639                                              walk_state);
640                 if (ACPI_FAILURE(status)) {
641                         return_ACPI_STATUS(status);
642                 }
643
644                 /* Init the method arguments */
645
646                 status = acpi_ds_method_data_init_args(walk_state->params,
647                                                        ACPI_METHOD_NUM_ARGS,
648                                                        walk_state);
649                 if (ACPI_FAILURE(status)) {
650                         return_ACPI_STATUS(status);
651                 }
652         } else {
653                 /*
654                  * Setup the current scope.
655                  * Find a Named Op that has a namespace node associated with it.
656                  * search upwards from this Op.  Current scope is the first
657                  * Op with a namespace node.
658                  */
659                 extra_op = parser_state->start_op;
660                 while (extra_op && !extra_op->common.node) {
661                         extra_op = extra_op->common.parent;
662                 }
663
664                 if (!extra_op) {
665                         parser_state->start_node = NULL;
666                 } else {
667                         parser_state->start_node = extra_op->common.node;
668                 }
669
670                 if (parser_state->start_node) {
671
672                         /* Push start scope on scope stack and make it current  */
673
674                         status =
675                             acpi_ds_scope_stack_push(parser_state->start_node,
676                                                      parser_state->start_node->
677                                                      type, walk_state);
678                         if (ACPI_FAILURE(status)) {
679                                 return_ACPI_STATUS(status);
680                         }
681                 }
682         }
683
684         status = acpi_ds_init_callbacks(walk_state, pass_number);
685         return_ACPI_STATUS(status);
686 }
687
688 /*******************************************************************************
689  *
690  * FUNCTION:    acpi_ds_delete_walk_state
691  *
692  * PARAMETERS:  walk_state      - State to delete
693  *
694  * RETURN:      Status
695  *
696  * DESCRIPTION: Delete a walk state including all internal data structures
697  *
698  ******************************************************************************/
699
700 void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state)
701 {
702         union acpi_generic_state *state;
703
704         ACPI_FUNCTION_TRACE_PTR(ds_delete_walk_state, walk_state);
705
706         if (!walk_state) {
707                 return;
708         }
709
710         if (walk_state->descriptor_type != ACPI_DESC_TYPE_WALK) {
711                 ACPI_ERROR((AE_INFO, "%p is not a valid walk state",
712                             walk_state));
713                 return;
714         }
715
716         /* There should not be any open scopes */
717
718         if (walk_state->parser_state.scope) {
719                 ACPI_ERROR((AE_INFO, "%p walk still has a scope list",
720                             walk_state));
721                 acpi_ps_cleanup_scope(&walk_state->parser_state);
722         }
723
724         /* Always must free any linked control states */
725
726         while (walk_state->control_state) {
727                 state = walk_state->control_state;
728                 walk_state->control_state = state->common.next;
729
730                 acpi_ut_delete_generic_state(state);
731         }
732
733         /* Always must free any linked parse states */
734
735         while (walk_state->scope_info) {
736                 state = walk_state->scope_info;
737                 walk_state->scope_info = state->common.next;
738
739                 acpi_ut_delete_generic_state(state);
740         }
741
742         /* Always must free any stacked result states */
743
744         while (walk_state->results) {
745                 state = walk_state->results;
746                 walk_state->results = state->common.next;
747
748                 acpi_ut_delete_generic_state(state);
749         }
750
751         ACPI_FREE(walk_state);
752         return_VOID;
753 }