Merge branch 'linus' into x86/step
[linux-2.6] / drivers / acpi / namespace / nsxfeval.c
1 /*******************************************************************************
2  *
3  * Module Name: nsxfeval - Public interfaces to the ACPI subsystem
4  *                         ACPI Object evaluation interfaces
5  *
6  ******************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44
45 #include <acpi/acpi.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acinterp.h>
48
49 #define _COMPONENT          ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsxfeval")
51 #ifdef ACPI_FUTURE_USAGE
52 /*******************************************************************************
53  *
54  * FUNCTION:    acpi_evaluate_object_typed
55  *
56  * PARAMETERS:  Handle              - Object handle (optional)
57  *              Pathname            - Object pathname (optional)
58  *              external_params     - List of parameters to pass to method,
59  *                                    terminated by NULL.  May be NULL
60  *                                    if no parameters are being passed.
61  *              return_buffer       - Where to put method's return value (if
62  *                                    any).  If NULL, no value is returned.
63  *              return_type         - Expected type of return object
64  *
65  * RETURN:      Status
66  *
67  * DESCRIPTION: Find and evaluate the given object, passing the given
68  *              parameters if necessary.  One of "Handle" or "Pathname" must
69  *              be valid (non-null)
70  *
71  ******************************************************************************/
72 acpi_status
73 acpi_evaluate_object_typed(acpi_handle handle,
74                            acpi_string pathname,
75                            struct acpi_object_list *external_params,
76                            struct acpi_buffer *return_buffer,
77                            acpi_object_type return_type)
78 {
79         acpi_status status;
80         u8 must_free = FALSE;
81
82         ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
83
84         /* Return buffer must be valid */
85
86         if (!return_buffer) {
87                 return_ACPI_STATUS(AE_BAD_PARAMETER);
88         }
89
90         if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
91                 must_free = TRUE;
92         }
93
94         /* Evaluate the object */
95
96         status =
97             acpi_evaluate_object(handle, pathname, external_params,
98                                  return_buffer);
99         if (ACPI_FAILURE(status)) {
100                 return_ACPI_STATUS(status);
101         }
102
103         /* Type ANY means "don't care" */
104
105         if (return_type == ACPI_TYPE_ANY) {
106                 return_ACPI_STATUS(AE_OK);
107         }
108
109         if (return_buffer->length == 0) {
110
111                 /* Error because caller specifically asked for a return value */
112
113                 ACPI_ERROR((AE_INFO, "No return value"));
114                 return_ACPI_STATUS(AE_NULL_OBJECT);
115         }
116
117         /* Examine the object type returned from evaluate_object */
118
119         if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
120                 return_ACPI_STATUS(AE_OK);
121         }
122
123         /* Return object type does not match requested type */
124
125         ACPI_ERROR((AE_INFO,
126                     "Incorrect return type [%s] requested [%s]",
127                     acpi_ut_get_type_name(((union acpi_object *)return_buffer->
128                                            pointer)->type),
129                     acpi_ut_get_type_name(return_type)));
130
131         if (must_free) {
132
133                 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
134
135                 ACPI_FREE(return_buffer->pointer);
136                 return_buffer->pointer = NULL;
137         }
138
139         return_buffer->length = 0;
140         return_ACPI_STATUS(AE_TYPE);
141 }
142
143 ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)
144 #endif                          /*  ACPI_FUTURE_USAGE  */
145 /*******************************************************************************
146  *
147  * FUNCTION:    acpi_evaluate_object
148  *
149  * PARAMETERS:  Handle              - Object handle (optional)
150  *              Pathname            - Object pathname (optional)
151  *              external_params     - List of parameters to pass to method,
152  *                                    terminated by NULL.  May be NULL
153  *                                    if no parameters are being passed.
154  *              return_buffer       - Where to put method's return value (if
155  *                                    any).  If NULL, no value is returned.
156  *
157  * RETURN:      Status
158  *
159  * DESCRIPTION: Find and evaluate the given object, passing the given
160  *              parameters if necessary.  One of "Handle" or "Pathname" must
161  *              be valid (non-null)
162  *
163  ******************************************************************************/
164 acpi_status
165 acpi_evaluate_object(acpi_handle handle,
166                      acpi_string pathname,
167                      struct acpi_object_list *external_params,
168                      struct acpi_buffer *return_buffer)
169 {
170         acpi_status status;
171         struct acpi_evaluate_info *info;
172         acpi_size buffer_space_needed;
173         u32 i;
174
175         ACPI_FUNCTION_TRACE(acpi_evaluate_object);
176
177         /* Allocate and initialize the evaluation information block */
178
179         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
180         if (!info) {
181                 return_ACPI_STATUS(AE_NO_MEMORY);
182         }
183
184         info->pathname = pathname;
185
186         /* Convert and validate the device handle */
187
188         info->prefix_node = acpi_ns_map_handle_to_node(handle);
189         if (!info->prefix_node) {
190                 status = AE_BAD_PARAMETER;
191                 goto cleanup;
192         }
193
194         /*
195          * If there are parameters to be passed to a control method, the external
196          * objects must all be converted to internal objects
197          */
198         if (external_params && external_params->count) {
199                 /*
200                  * Allocate a new parameter block for the internal objects
201                  * Add 1 to count to allow for null terminated internal list
202                  */
203                 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)
204                                                          external_params->
205                                                          count +
206                                                          1) * sizeof(void *));
207                 if (!info->parameters) {
208                         status = AE_NO_MEMORY;
209                         goto cleanup;
210                 }
211
212                 /* Convert each external object in the list to an internal object */
213
214                 for (i = 0; i < external_params->count; i++) {
215                         status =
216                             acpi_ut_copy_eobject_to_iobject(&external_params->
217                                                             pointer[i],
218                                                             &info->
219                                                             parameters[i]);
220                         if (ACPI_FAILURE(status)) {
221                                 goto cleanup;
222                         }
223                 }
224                 info->parameters[external_params->count] = NULL;
225         }
226
227         /*
228          * Three major cases:
229          * 1) Fully qualified pathname
230          * 2) No handle, not fully qualified pathname (error)
231          * 3) Valid handle
232          */
233         if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) {
234
235                 /* The path is fully qualified, just evaluate by name */
236
237                 info->prefix_node = NULL;
238                 status = acpi_ns_evaluate(info);
239         } else if (!handle) {
240                 /*
241                  * A handle is optional iff a fully qualified pathname is specified.
242                  * Since we've already handled fully qualified names above, this is
243                  * an error
244                  */
245                 if (!pathname) {
246                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
247                                           "Both Handle and Pathname are NULL"));
248                 } else {
249                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250                                           "Null Handle with relative pathname [%s]",
251                                           pathname));
252                 }
253
254                 status = AE_BAD_PARAMETER;
255         } else {
256                 /* We have a namespace a node and a possible relative path */
257
258                 status = acpi_ns_evaluate(info);
259         }
260
261         /*
262          * If we are expecting a return value, and all went well above,
263          * copy the return value to an external object.
264          */
265         if (return_buffer) {
266                 if (!info->return_object) {
267                         return_buffer->length = 0;
268                 } else {
269                         if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==
270                             ACPI_DESC_TYPE_NAMED) {
271                                 /*
272                                  * If we received a NS Node as a return object, this means that
273                                  * the object we are evaluating has nothing interesting to
274                                  * return (such as a mutex, etc.)  We return an error because
275                                  * these types are essentially unsupported by this interface.
276                                  * We don't check up front because this makes it easier to add
277                                  * support for various types at a later date if necessary.
278                                  */
279                                 status = AE_TYPE;
280                                 info->return_object = NULL;     /* No need to delete a NS Node */
281                                 return_buffer->length = 0;
282                         }
283
284                         if (ACPI_SUCCESS(status)) {
285
286                                 /* Get the size of the returned object */
287
288                                 status =
289                                     acpi_ut_get_object_size(info->return_object,
290                                                             &buffer_space_needed);
291                                 if (ACPI_SUCCESS(status)) {
292
293                                         /* Validate/Allocate/Clear caller buffer */
294
295                                         status =
296                                             acpi_ut_initialize_buffer
297                                             (return_buffer,
298                                              buffer_space_needed);
299                                         if (ACPI_FAILURE(status)) {
300                                                 /*
301                                                  * Caller's buffer is too small or a new one can't
302                                                  * be allocated
303                                                  */
304                                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
305                                                                   "Needed buffer size %X, %s\n",
306                                                                   (u32)
307                                                                   buffer_space_needed,
308                                                                   acpi_format_exception
309                                                                   (status)));
310                                         } else {
311                                                 /* We have enough space for the object, build it */
312
313                                                 status =
314                                                     acpi_ut_copy_iobject_to_eobject
315                                                     (info->return_object,
316                                                      return_buffer);
317                                         }
318                                 }
319                         }
320                 }
321         }
322
323         if (info->return_object) {
324                 /*
325                  * Delete the internal return object. NOTE: Interpreter must be
326                  * locked to avoid race condition.
327                  */
328                 acpi_ex_enter_interpreter();
329
330                 /* Remove one reference on the return object (should delete it) */
331
332                 acpi_ut_remove_reference(info->return_object);
333                 acpi_ex_exit_interpreter();
334         }
335
336       cleanup:
337
338         /* Free the input parameter list (if we created one) */
339
340         if (info->parameters) {
341
342                 /* Free the allocated parameter block */
343
344                 acpi_ut_delete_internal_object_list(info->parameters);
345         }
346
347         ACPI_FREE(info);
348         return_ACPI_STATUS(status);
349 }
350
351 ACPI_EXPORT_SYMBOL(acpi_evaluate_object)
352
353 /*******************************************************************************
354  *
355  * FUNCTION:    acpi_walk_namespace
356  *
357  * PARAMETERS:  Type                - acpi_object_type to search for
358  *              start_object        - Handle in namespace where search begins
359  *              max_depth           - Depth to which search is to reach
360  *              user_function       - Called when an object of "Type" is found
361  *              Context             - Passed to user function
362  *              return_value        - Location where return value of
363  *                                    user_function is put if terminated early
364  *
365  * RETURNS      Return value from the user_function if terminated early.
366  *              Otherwise, returns NULL.
367  *
368  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
369  *              starting (and ending) at the object specified by start_handle.
370  *              The user_function is called whenever an object that matches
371  *              the type parameter is found.  If the user function returns
372  *              a non-zero value, the search is terminated immediately and this
373  *              value is returned to the caller.
374  *
375  *              The point of this procedure is to provide a generic namespace
376  *              walk routine that can be called from multiple places to
377  *              provide multiple services;  the User Function can be tailored
378  *              to each task, whether it is a print function, a compare
379  *              function, etc.
380  *
381  ******************************************************************************/
382 acpi_status
383 acpi_walk_namespace(acpi_object_type type,
384                     acpi_handle start_object,
385                     u32 max_depth,
386                     acpi_walk_callback user_function,
387                     void *context, void **return_value)
388 {
389         acpi_status status;
390
391         ACPI_FUNCTION_TRACE(acpi_walk_namespace);
392
393         /* Parameter validation */
394
395         if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) {
396                 return_ACPI_STATUS(AE_BAD_PARAMETER);
397         }
398
399         /*
400          * Lock the namespace around the walk.
401          * The namespace will be unlocked/locked around each call
402          * to the user function - since this function
403          * must be allowed to make Acpi calls itself.
404          */
405         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
406         if (ACPI_FAILURE(status)) {
407                 return_ACPI_STATUS(status);
408         }
409
410         status = acpi_ns_walk_namespace(type, start_object, max_depth,
411                                         ACPI_NS_WALK_UNLOCK,
412                                         user_function, context, return_value);
413
414         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
415         return_ACPI_STATUS(status);
416 }
417
418 ACPI_EXPORT_SYMBOL(acpi_walk_namespace)
419
420 /*******************************************************************************
421  *
422  * FUNCTION:    acpi_ns_get_device_callback
423  *
424  * PARAMETERS:  Callback from acpi_get_device
425  *
426  * RETURN:      Status
427  *
428  * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
429  *              present devices, or if they specified a HID, it filters based
430  *              on that.
431  *
432  ******************************************************************************/
433 static acpi_status
434 acpi_ns_get_device_callback(acpi_handle obj_handle,
435                             u32 nesting_level,
436                             void *context, void **return_value)
437 {
438         struct acpi_get_devices_info *info = context;
439         acpi_status status;
440         struct acpi_namespace_node *node;
441         u32 flags;
442         struct acpica_device_id hid;
443         struct acpi_compatible_id_list *cid;
444         u32 i;
445         int found;
446
447         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
448         if (ACPI_FAILURE(status)) {
449                 return (status);
450         }
451
452         node = acpi_ns_map_handle_to_node(obj_handle);
453         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
454         if (ACPI_FAILURE(status)) {
455                 return (status);
456         }
457
458         if (!node) {
459                 return (AE_BAD_PARAMETER);
460         }
461
462         /* Run _STA to determine if device is present */
463
464         status = acpi_ut_execute_STA(node, &flags);
465         if (ACPI_FAILURE(status)) {
466                 return (AE_CTRL_DEPTH);
467         }
468
469         if (!(flags & ACPI_STA_DEVICE_PRESENT) &&
470             !(flags & ACPI_STA_DEVICE_FUNCTIONING)) {
471                 /*
472                  * Don't examine the children of the device only when the
473                  * device is neither present nor functional. See ACPI spec,
474                  * description of _STA for more information.
475                  */
476                 return (AE_CTRL_DEPTH);
477         }
478
479         /* Filter based on device HID & CID */
480
481         if (info->hid != NULL) {
482                 status = acpi_ut_execute_HID(node, &hid);
483                 if (status == AE_NOT_FOUND) {
484                         return (AE_OK);
485                 } else if (ACPI_FAILURE(status)) {
486                         return (AE_CTRL_DEPTH);
487                 }
488
489                 if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) {
490
491                         /* Get the list of Compatible IDs */
492
493                         status = acpi_ut_execute_CID(node, &cid);
494                         if (status == AE_NOT_FOUND) {
495                                 return (AE_OK);
496                         } else if (ACPI_FAILURE(status)) {
497                                 return (AE_CTRL_DEPTH);
498                         }
499
500                         /* Walk the CID list */
501
502                         found = 0;
503                         for (i = 0; i < cid->count; i++) {
504                                 if (ACPI_STRNCMP(cid->id[i].value, info->hid,
505                                                  sizeof(struct
506                                                         acpi_compatible_id)) ==
507                                     0) {
508                                         found = 1;
509                                         break;
510                                 }
511                         }
512                         ACPI_FREE(cid);
513                         if (!found)
514                                 return (AE_OK);
515                 }
516         }
517
518         status = info->user_function(obj_handle, nesting_level, info->context,
519                                      return_value);
520         return (status);
521 }
522
523 /*******************************************************************************
524  *
525  * FUNCTION:    acpi_get_devices
526  *
527  * PARAMETERS:  HID                 - HID to search for. Can be NULL.
528  *              user_function       - Called when a matching object is found
529  *              Context             - Passed to user function
530  *              return_value        - Location where return value of
531  *                                    user_function is put if terminated early
532  *
533  * RETURNS      Return value from the user_function if terminated early.
534  *              Otherwise, returns NULL.
535  *
536  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
537  *              starting (and ending) at the object specified by start_handle.
538  *              The user_function is called whenever an object of type
539  *              Device is found.  If the user function returns
540  *              a non-zero value, the search is terminated immediately and this
541  *              value is returned to the caller.
542  *
543  *              This is a wrapper for walk_namespace, but the callback performs
544  *              additional filtering. Please see acpi_ns_get_device_callback.
545  *
546  ******************************************************************************/
547
548 acpi_status
549 acpi_get_devices(const char *HID,
550                  acpi_walk_callback user_function,
551                  void *context, void **return_value)
552 {
553         acpi_status status;
554         struct acpi_get_devices_info info;
555
556         ACPI_FUNCTION_TRACE(acpi_get_devices);
557
558         /* Parameter validation */
559
560         if (!user_function) {
561                 return_ACPI_STATUS(AE_BAD_PARAMETER);
562         }
563
564         /*
565          * We're going to call their callback from OUR callback, so we need
566          * to know what it is, and their context parameter.
567          */
568         info.hid = HID;
569         info.context = context;
570         info.user_function = user_function;
571
572         /*
573          * Lock the namespace around the walk.
574          * The namespace will be unlocked/locked around each call
575          * to the user function - since this function
576          * must be allowed to make Acpi calls itself.
577          */
578         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
579         if (ACPI_FAILURE(status)) {
580                 return_ACPI_STATUS(status);
581         }
582
583         status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
584                                         ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
585                                         acpi_ns_get_device_callback, &info,
586                                         return_value);
587
588         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
589         return_ACPI_STATUS(status);
590 }
591
592 ACPI_EXPORT_SYMBOL(acpi_get_devices)
593
594 /*******************************************************************************
595  *
596  * FUNCTION:    acpi_attach_data
597  *
598  * PARAMETERS:  obj_handle          - Namespace node
599  *              Handler             - Handler for this attachment
600  *              Data                - Pointer to data to be attached
601  *
602  * RETURN:      Status
603  *
604  * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
605  *
606  ******************************************************************************/
607 acpi_status
608 acpi_attach_data(acpi_handle obj_handle,
609                  acpi_object_handler handler, void *data)
610 {
611         struct acpi_namespace_node *node;
612         acpi_status status;
613
614         /* Parameter validation */
615
616         if (!obj_handle || !handler || !data) {
617                 return (AE_BAD_PARAMETER);
618         }
619
620         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
621         if (ACPI_FAILURE(status)) {
622                 return (status);
623         }
624
625         /* Convert and validate the handle */
626
627         node = acpi_ns_map_handle_to_node(obj_handle);
628         if (!node) {
629                 status = AE_BAD_PARAMETER;
630                 goto unlock_and_exit;
631         }
632
633         status = acpi_ns_attach_data(node, handler, data);
634
635       unlock_and_exit:
636         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
637         return (status);
638 }
639
640 ACPI_EXPORT_SYMBOL(acpi_attach_data)
641
642 /*******************************************************************************
643  *
644  * FUNCTION:    acpi_detach_data
645  *
646  * PARAMETERS:  obj_handle          - Namespace node handle
647  *              Handler             - Handler used in call to acpi_attach_data
648  *
649  * RETURN:      Status
650  *
651  * DESCRIPTION: Remove data that was previously attached to a node.
652  *
653  ******************************************************************************/
654 acpi_status
655 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
656 {
657         struct acpi_namespace_node *node;
658         acpi_status status;
659
660         /* Parameter validation */
661
662         if (!obj_handle || !handler) {
663                 return (AE_BAD_PARAMETER);
664         }
665
666         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
667         if (ACPI_FAILURE(status)) {
668                 return (status);
669         }
670
671         /* Convert and validate the handle */
672
673         node = acpi_ns_map_handle_to_node(obj_handle);
674         if (!node) {
675                 status = AE_BAD_PARAMETER;
676                 goto unlock_and_exit;
677         }
678
679         status = acpi_ns_detach_data(node, handler);
680
681       unlock_and_exit:
682         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
683         return (status);
684 }
685
686 ACPI_EXPORT_SYMBOL(acpi_detach_data)
687
688 /*******************************************************************************
689  *
690  * FUNCTION:    acpi_get_data
691  *
692  * PARAMETERS:  obj_handle          - Namespace node
693  *              Handler             - Handler used in call to attach_data
694  *              Data                - Where the data is returned
695  *
696  * RETURN:      Status
697  *
698  * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
699  *
700  ******************************************************************************/
701 acpi_status
702 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
703 {
704         struct acpi_namespace_node *node;
705         acpi_status status;
706
707         /* Parameter validation */
708
709         if (!obj_handle || !handler || !data) {
710                 return (AE_BAD_PARAMETER);
711         }
712
713         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
714         if (ACPI_FAILURE(status)) {
715                 return (status);
716         }
717
718         /* Convert and validate the handle */
719
720         node = acpi_ns_map_handle_to_node(obj_handle);
721         if (!node) {
722                 status = AE_BAD_PARAMETER;
723                 goto unlock_and_exit;
724         }
725
726         status = acpi_ns_get_attached_data(node, handler, data);
727
728       unlock_and_exit:
729         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
730         return (status);
731 }
732
733 ACPI_EXPORT_SYMBOL(acpi_get_data)