]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/acpi/namespace/nsxfeval.c
8904d0fae6a2ff90794389456b6f62420c5410d3
[linux-2.6.git] / 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 - 2007, R. Byron Moore
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
52 #ifdef ACPI_FUTURE_USAGE
53 /*******************************************************************************
54  *
55  * FUNCTION:    acpi_evaluate_object_typed
56  *
57  * PARAMETERS:  Handle              - Object handle (optional)
58  *              Pathname            - Object pathname (optional)
59  *              external_params     - List of parameters to pass to method,
60  *                                    terminated by NULL.  May be NULL
61  *                                    if no parameters are being passed.
62  *              return_buffer       - Where to put method's return value (if
63  *                                    any).  If NULL, no value is returned.
64  *              return_type         - Expected type of return object
65  *
66  * RETURN:      Status
67  *
68  * DESCRIPTION: Find and evaluate the given object, passing the given
69  *              parameters if necessary.  One of "Handle" or "Pathname" must
70  *              be valid (non-null)
71  *
72  ******************************************************************************/
73 acpi_status
74 acpi_evaluate_object_typed(acpi_handle handle,
75                            acpi_string pathname,
76                            struct acpi_object_list * external_params,
77                            struct acpi_buffer * return_buffer,
78                            acpi_object_type return_type)
79 {
80         acpi_status status;
81         u8 must_free = FALSE;
82
83         ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
84
85         /* Return buffer must be valid */
86
87         if (!return_buffer) {
88                 return_ACPI_STATUS(AE_BAD_PARAMETER);
89         }
90
91         if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
92                 must_free = TRUE;
93         }
94
95         /* Evaluate the object */
96
97         status =
98             acpi_evaluate_object(handle, pathname, external_params,
99                                  return_buffer);
100         if (ACPI_FAILURE(status)) {
101                 return_ACPI_STATUS(status);
102         }
103
104         /* Type ANY means "don't care" */
105
106         if (return_type == ACPI_TYPE_ANY) {
107                 return_ACPI_STATUS(AE_OK);
108         }
109
110         if (return_buffer->length == 0) {
111
112                 /* Error because caller specifically asked for a return value */
113
114                 ACPI_ERROR((AE_INFO, "No return value"));
115                 return_ACPI_STATUS(AE_NULL_OBJECT);
116         }
117
118         /* Examine the object type returned from evaluate_object */
119
120         if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
121                 return_ACPI_STATUS(AE_OK);
122         }
123
124         /* Return object type does not match requested type */
125
126         ACPI_ERROR((AE_INFO,
127                     "Incorrect return type [%s] requested [%s]",
128                     acpi_ut_get_type_name(((union acpi_object *)return_buffer->
129                                            pointer)->type),
130                     acpi_ut_get_type_name(return_type)));
131
132         if (must_free) {
133
134                 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
135
136                 ACPI_FREE(return_buffer->pointer);
137                 return_buffer->pointer = NULL;
138         }
139
140         return_buffer->length = 0;
141         return_ACPI_STATUS(AE_TYPE);
142 }
143
144 ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)
145 #endif                          /*  ACPI_FUTURE_USAGE  */
146
147 /*******************************************************************************
148  *
149  * FUNCTION:    acpi_evaluate_object
150  *
151  * PARAMETERS:  Handle              - Object handle (optional)
152  *              Pathname            - Object pathname (optional)
153  *              external_params     - List of parameters to pass to method,
154  *                                    terminated by NULL.  May be NULL
155  *                                    if no parameters are being passed.
156  *              return_buffer       - Where to put method's return value (if
157  *                                    any).  If NULL, no value is returned.
158  *
159  * RETURN:      Status
160  *
161  * DESCRIPTION: Find and evaluate the given object, passing the given
162  *              parameters if necessary.  One of "Handle" or "Pathname" must
163  *              be valid (non-null)
164  *
165  ******************************************************************************/
166 acpi_status
167 acpi_evaluate_object(acpi_handle handle,
168                      acpi_string pathname,
169                      struct acpi_object_list *external_params,
170                      struct acpi_buffer *return_buffer)
171 {
172         acpi_status status;
173         acpi_status status2;
174         struct acpi_evaluate_info *info;
175         acpi_size buffer_space_needed;
176         u32 i;
177
178         ACPI_FUNCTION_TRACE(acpi_evaluate_object);
179
180         /* Allocate and initialize the evaluation information block */
181
182         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
183         if (!info) {
184                 return_ACPI_STATUS(AE_NO_MEMORY);
185         }
186
187         info->pathname = pathname;
188         info->parameter_type = ACPI_PARAM_ARGS;
189
190         /* Convert and validate the device handle */
191
192         info->prefix_node = acpi_ns_map_handle_to_node(handle);
193         if (!info->prefix_node) {
194                 status = AE_BAD_PARAMETER;
195                 goto cleanup;
196         }
197
198         /*
199          * If there are parameters to be passed to a control method, the external
200          * objects must all be converted to internal objects
201          */
202         if (external_params && external_params->count) {
203                 /*
204                  * Allocate a new parameter block for the internal objects
205                  * Add 1 to count to allow for null terminated internal list
206                  */
207                 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)
208                                                          external_params->
209                                                          count +
210                                                          1) * sizeof(void *));
211                 if (!info->parameters) {
212                         status = AE_NO_MEMORY;
213                         goto cleanup;
214                 }
215
216                 /* Convert each external object in the list to an internal object */
217
218                 for (i = 0; i < external_params->count; i++) {
219                         status =
220                             acpi_ut_copy_eobject_to_iobject(&external_params->
221                                                             pointer[i],
222                                                             &info->
223                                                             parameters[i]);
224                         if (ACPI_FAILURE(status)) {
225                                 goto cleanup;
226                         }
227                 }
228                 info->parameters[external_params->count] = NULL;
229         }
230
231         /*
232          * Three major cases:
233          * 1) Fully qualified pathname
234          * 2) No handle, not fully qualified pathname (error)
235          * 3) Valid handle
236          */
237         if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) {
238
239                 /* The path is fully qualified, just evaluate by name */
240
241                 info->prefix_node = NULL;
242                 status = acpi_ns_evaluate(info);
243         } else if (!handle) {
244                 /*
245                  * A handle is optional iff a fully qualified pathname is specified.
246                  * Since we've already handled fully qualified names above, this is
247                  * an error
248                  */
249                 if (!pathname) {
250                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251                                           "Both Handle and Pathname are NULL"));
252                 } else {
253                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
254                                           "Null Handle with relative pathname [%s]",
255                                           pathname));
256                 }
257
258                 status = AE_BAD_PARAMETER;
259         } else {
260                 /* We have a namespace a node and a possible relative path */
261
262                 status = acpi_ns_evaluate(info);
263         }
264
265         /*
266          * If we are expecting a return value, and all went well above,
267          * copy the return value to an external object.
268          */
269         if (return_buffer) {
270                 if (!info->return_object) {
271                         return_buffer->length = 0;
272                 } else {
273                         if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==
274                             ACPI_DESC_TYPE_NAMED) {
275                                 /*
276                                  * If we received a NS Node as a return object, this means that
277                                  * the object we are evaluating has nothing interesting to
278                                  * return (such as a mutex, etc.)  We return an error because
279                                  * these types are essentially unsupported by this interface.
280                                  * We don't check up front because this makes it easier to add
281                                  * support for various types at a later date if necessary.
282                                  */
283                                 status = AE_TYPE;
284                                 info->return_object = NULL;     /* No need to delete a NS Node */
285                                 return_buffer->length = 0;
286                         }
287
288                         if (ACPI_SUCCESS(status)) {
289
290                                 /* Get the size of the returned object */
291
292                                 status =
293                                     acpi_ut_get_object_size(info->return_object,
294                                                             &buffer_space_needed);
295                                 if (ACPI_SUCCESS(status)) {
296
297                                         /* Validate/Allocate/Clear caller buffer */
298
299                                         status =
300                                             acpi_ut_initialize_buffer
301                                             (return_buffer,
302                                              buffer_space_needed);
303                                         if (ACPI_FAILURE(status)) {
304                                                 /*
305                                                  * Caller's buffer is too small or a new one can't
306                                                  * be allocated
307                                                  */
308                                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
309                                                                   "Needed buffer size %X, %s\n",
310                                                                   (u32)
311                                                                   buffer_space_needed,
312                                                                   acpi_format_exception
313                                                                   (status)));
314                                         } else {
315                                                 /* We have enough space for the object, build it */
316
317                                                 status =
318                                                     acpi_ut_copy_iobject_to_eobject
319                                                     (info->return_object,
320                                                      return_buffer);
321                                         }
322                                 }
323                         }
324                 }
325         }
326
327         if (info->return_object) {
328                 /*
329                  * Delete the internal return object. NOTE: Interpreter must be
330                  * locked to avoid race condition.
331                  */
332                 status2 = acpi_ex_enter_interpreter();
333                 if (ACPI_SUCCESS(status2)) {
334
335                         /* Remove one reference on the return object (should delete it) */
336
337                         acpi_ut_remove_reference(info->return_object);
338                         acpi_ex_exit_interpreter();
339                 }
340         }
341
342       cleanup:
343
344         /* Free the input parameter list (if we created one) */
345
346         if (info->parameters) {
347
348                 /* Free the allocated parameter block */
349
350                 acpi_ut_delete_internal_object_list(info->parameters);
351         }
352
353         ACPI_FREE(info);
354         return_ACPI_STATUS(status);
355 }
356
357 ACPI_EXPORT_SYMBOL(acpi_evaluate_object)
358
359 /*******************************************************************************
360  *
361  * FUNCTION:    acpi_walk_namespace
362  *
363  * PARAMETERS:  Type                - acpi_object_type to search for
364  *              start_object        - Handle in namespace where search begins
365  *              max_depth           - Depth to which search is to reach
366  *              user_function       - Called when an object of "Type" is found
367  *              Context             - Passed to user function
368  *              return_value        - Location where return value of
369  *                                    user_function is put if terminated early
370  *
371  * RETURNS      Return value from the user_function if terminated early.
372  *              Otherwise, returns NULL.
373  *
374  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
375  *              starting (and ending) at the object specified by start_handle.
376  *              The user_function is called whenever an object that matches
377  *              the type parameter is found.  If the user function returns
378  *              a non-zero value, the search is terminated immediately and this
379  *              value is returned to the caller.
380  *
381  *              The point of this procedure is to provide a generic namespace
382  *              walk routine that can be called from multiple places to
383  *              provide multiple services;  the User Function can be tailored
384  *              to each task, whether it is a print function, a compare
385  *              function, etc.
386  *
387  ******************************************************************************/
388 acpi_status
389 acpi_walk_namespace(acpi_object_type type,
390                     acpi_handle start_object,
391                     u32 max_depth,
392                     acpi_walk_callback user_function,
393                     void *context, void **return_value)
394 {
395         acpi_status status;
396
397         ACPI_FUNCTION_TRACE(acpi_walk_namespace);
398
399         /* Parameter validation */
400
401         if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) {
402                 return_ACPI_STATUS(AE_BAD_PARAMETER);
403         }
404
405         /*
406          * Lock the namespace around the walk.
407          * The namespace will be unlocked/locked around each call
408          * to the user function - since this function
409          * must be allowed to make Acpi calls itself.
410          */
411         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
412         if (ACPI_FAILURE(status)) {
413                 return_ACPI_STATUS(status);
414         }
415
416         status = acpi_ns_walk_namespace(type, start_object, max_depth,
417                                         ACPI_NS_WALK_UNLOCK,
418                                         user_function, context, return_value);
419
420         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
421         return_ACPI_STATUS(status);
422 }
423
424 ACPI_EXPORT_SYMBOL(acpi_walk_namespace)
425
426 /*******************************************************************************
427  *
428  * FUNCTION:    acpi_ns_get_device_callback
429  *
430  * PARAMETERS:  Callback from acpi_get_device
431  *
432  * RETURN:      Status
433  *
434  * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
435  *              present devices, or if they specified a HID, it filters based
436  *              on that.
437  *
438  ******************************************************************************/
439 static acpi_status
440 acpi_ns_get_device_callback(acpi_handle obj_handle,
441                             u32 nesting_level,
442                             void *context, void **return_value)
443 {
444         struct acpi_get_devices_info *info = context;
445         acpi_status status;
446         struct acpi_namespace_node *node;
447         u32 flags;
448         struct acpi_device_id hid;
449         struct acpi_compatible_id_list *cid;
450         acpi_native_uint i;
451
452         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
453         if (ACPI_FAILURE(status)) {
454                 return (status);
455         }
456
457         node = acpi_ns_map_handle_to_node(obj_handle);
458         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
459         if (ACPI_FAILURE(status)) {
460                 return (status);
461         }
462
463         if (!node) {
464                 return (AE_BAD_PARAMETER);
465         }
466
467         /* Run _STA to determine if device is present */
468
469         status = acpi_ut_execute_STA(node, &flags);
470         if (ACPI_FAILURE(status)) {
471                 return (AE_CTRL_DEPTH);
472         }
473
474         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
475
476                 /* Don't examine children of the device if not present */
477
478                 return (AE_CTRL_DEPTH);
479         }
480
481         /* Filter based on device HID & CID */
482
483         if (info->hid != NULL) {
484                 status = acpi_ut_execute_HID(node, &hid);
485                 if (status == AE_NOT_FOUND) {
486                         return (AE_OK);
487                 } else if (ACPI_FAILURE(status)) {
488                         return (AE_CTRL_DEPTH);
489                 }
490
491                 if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) {
492
493                         /* Get the list of Compatible IDs */
494
495                         status = acpi_ut_execute_CID(node, &cid);
496                         if (status == AE_NOT_FOUND) {
497                                 return (AE_OK);
498                         } else if (ACPI_FAILURE(status)) {
499                                 return (AE_CTRL_DEPTH);
500                         }
501
502                         /* Walk the CID list */
503
504                         for (i = 0; i < cid->count; i++) {
505                                 if (ACPI_STRNCMP(cid->id[i].value, info->hid,
506                                                  sizeof(struct
507                                                         acpi_compatible_id)) !=
508                                     0) {
509                                         ACPI_FREE(cid);
510                                         return (AE_OK);
511                                 }
512                         }
513                         ACPI_FREE(cid);
514                 }
515         }
516
517         status = info->user_function(obj_handle, nesting_level, info->context,
518                                      return_value);
519         return (status);
520 }
521
522 /*******************************************************************************
523  *
524  * FUNCTION:    acpi_get_devices
525  *
526  * PARAMETERS:  HID                 - HID to search for. Can be NULL.
527  *              user_function       - Called when a matching object is found
528  *              Context             - Passed to user function
529  *              return_value        - Location where return value of
530  *                                    user_function is put if terminated early
531  *
532  * RETURNS      Return value from the user_function if terminated early.
533  *              Otherwise, returns NULL.
534  *
535  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
536  *              starting (and ending) at the object specified by start_handle.
537  *              The user_function is called whenever an object of type
538  *              Device is found.  If the user function returns
539  *              a non-zero value, the search is terminated immediately and this
540  *              value is returned to the caller.
541  *
542  *              This is a wrapper for walk_namespace, but the callback performs
543  *              additional filtering. Please see acpi_get_device_callback.
544  *
545  ******************************************************************************/
546
547 acpi_status
548 acpi_get_devices(char *HID,
549                  acpi_walk_callback user_function,
550                  void *context, void **return_value)
551 {
552         acpi_status status;
553         struct acpi_get_devices_info info;
554
555         ACPI_FUNCTION_TRACE(acpi_get_devices);
556
557         /* Parameter validation */
558
559         if (!user_function) {
560                 return_ACPI_STATUS(AE_BAD_PARAMETER);
561         }
562
563         /*
564          * We're going to call their callback from OUR callback, so we need
565          * to know what it is, and their context parameter.
566          */
567         info.hid = HID;
568         info.context = context;
569         info.user_function = user_function;
570
571         /*
572          * Lock the namespace around the walk.
573          * The namespace will be unlocked/locked around each call
574          * to the user function - since this function
575          * must be allowed to make Acpi calls itself.
576          */
577         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
578         if (ACPI_FAILURE(status)) {
579                 return_ACPI_STATUS(status);
580         }
581
582         status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
583                                         ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
584                                         acpi_ns_get_device_callback, &info,
585                                         return_value);
586
587         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
588         return_ACPI_STATUS(status);
589 }
590
591 ACPI_EXPORT_SYMBOL(acpi_get_devices)
592
593 /*******************************************************************************
594  *
595  * FUNCTION:    acpi_attach_data
596  *
597  * PARAMETERS:  obj_handle          - Namespace node
598  *              Handler             - Handler for this attachment
599  *              Data                - Pointer to data to be attached
600  *
601  * RETURN:      Status
602  *
603  * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
604  *
605  ******************************************************************************/
606 acpi_status
607 acpi_attach_data(acpi_handle obj_handle,
608                  acpi_object_handler handler, void *data)
609 {
610         struct acpi_namespace_node *node;
611         acpi_status status;
612
613         /* Parameter validation */
614
615         if (!obj_handle || !handler || !data) {
616                 return (AE_BAD_PARAMETER);
617         }
618
619         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
620         if (ACPI_FAILURE(status)) {
621                 return (status);
622         }
623
624         /* Convert and validate the handle */
625
626         node = acpi_ns_map_handle_to_node(obj_handle);
627         if (!node) {
628                 status = AE_BAD_PARAMETER;
629                 goto unlock_and_exit;
630         }
631
632         status = acpi_ns_attach_data(node, handler, data);
633
634       unlock_and_exit:
635         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
636         return (status);
637 }
638
639 ACPI_EXPORT_SYMBOL(acpi_attach_data)
640
641 /*******************************************************************************
642  *
643  * FUNCTION:    acpi_detach_data
644  *
645  * PARAMETERS:  obj_handle          - Namespace node handle
646  *              Handler             - Handler used in call to acpi_attach_data
647  *
648  * RETURN:      Status
649  *
650  * DESCRIPTION: Remove data that was previously attached to a node.
651  *
652  ******************************************************************************/
653 acpi_status
654 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
655 {
656         struct acpi_namespace_node *node;
657         acpi_status status;
658
659         /* Parameter validation */
660
661         if (!obj_handle || !handler) {
662                 return (AE_BAD_PARAMETER);
663         }
664
665         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
666         if (ACPI_FAILURE(status)) {
667                 return (status);
668         }
669
670         /* Convert and validate the handle */
671
672         node = acpi_ns_map_handle_to_node(obj_handle);
673         if (!node) {
674                 status = AE_BAD_PARAMETER;
675                 goto unlock_and_exit;
676         }
677
678         status = acpi_ns_detach_data(node, handler);
679
680       unlock_and_exit:
681         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
682         return (status);
683 }
684
685 ACPI_EXPORT_SYMBOL(acpi_detach_data)
686
687 /*******************************************************************************
688  *
689  * FUNCTION:    acpi_get_data
690  *
691  * PARAMETERS:  obj_handle          - Namespace node
692  *              Handler             - Handler used in call to attach_data
693  *              Data                - Where the data is returned
694  *
695  * RETURN:      Status
696  *
697  * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
698  *
699  ******************************************************************************/
700 acpi_status
701 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
702 {
703         struct acpi_namespace_node *node;
704         acpi_status status;
705
706         /* Parameter validation */
707
708         if (!obj_handle || !handler || !data) {
709                 return (AE_BAD_PARAMETER);
710         }
711
712         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
713         if (ACPI_FAILURE(status)) {
714                 return (status);
715         }
716
717         /* Convert and validate the handle */
718
719         node = acpi_ns_map_handle_to_node(obj_handle);
720         if (!node) {
721                 status = AE_BAD_PARAMETER;
722                 goto unlock_and_exit;
723         }
724
725         status = acpi_ns_get_attached_data(node, handler, data);
726
727       unlock_and_exit:
728         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
729         return (status);
730 }
731
732 ACPI_EXPORT_SYMBOL(acpi_get_data)