1 /*******************************************************************************
3 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem
4 * ACPI Object evaluation interfaces
6 ******************************************************************************/
9 * Copyright (C) 2000 - 2013, Intel Corp.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
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.
45 #include <linux/export.h>
46 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nsxfeval")
54 /* Local prototypes */
55 static void acpi_ns_resolve_references(struct acpi_evaluate_info
*info
);
57 /*******************************************************************************
59 * FUNCTION: acpi_evaluate_object_typed
61 * PARAMETERS: handle - Object handle (optional)
62 * pathname - Object pathname (optional)
63 * external_params - List of parameters to pass to method,
64 * terminated by NULL. May be NULL
65 * if no parameters are being passed.
66 * return_buffer - Where to put method's return value (if
67 * any). If NULL, no value is returned.
68 * return_type - Expected type of return object
72 * DESCRIPTION: Find and evaluate the given object, passing the given
73 * parameters if necessary. One of "Handle" or "Pathname" must
76 ******************************************************************************/
79 acpi_evaluate_object_typed(acpi_handle handle
,
81 struct acpi_object_list
*external_params
,
82 struct acpi_buffer
*return_buffer
,
83 acpi_object_type return_type
)
88 ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed
);
90 /* Return buffer must be valid */
93 return_ACPI_STATUS(AE_BAD_PARAMETER
);
96 if (return_buffer
->length
== ACPI_ALLOCATE_BUFFER
) {
100 /* Evaluate the object */
103 acpi_evaluate_object(handle
, pathname
, external_params
,
105 if (ACPI_FAILURE(status
)) {
106 return_ACPI_STATUS(status
);
109 /* Type ANY means "don't care" */
111 if (return_type
== ACPI_TYPE_ANY
) {
112 return_ACPI_STATUS(AE_OK
);
115 if (return_buffer
->length
== 0) {
117 /* Error because caller specifically asked for a return value */
119 ACPI_ERROR((AE_INFO
, "No return value"));
120 return_ACPI_STATUS(AE_NULL_OBJECT
);
123 /* Examine the object type returned from evaluate_object */
125 if (((union acpi_object
*)return_buffer
->pointer
)->type
== return_type
) {
126 return_ACPI_STATUS(AE_OK
);
129 /* Return object type does not match requested type */
132 "Incorrect return type [%s] requested [%s]",
133 acpi_ut_get_type_name(((union acpi_object
*)return_buffer
->
135 acpi_ut_get_type_name(return_type
)));
139 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
141 ACPI_FREE(return_buffer
->pointer
);
142 return_buffer
->pointer
= NULL
;
145 return_buffer
->length
= 0;
146 return_ACPI_STATUS(AE_TYPE
);
149 ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed
)
151 /*******************************************************************************
153 * FUNCTION: acpi_evaluate_object
155 * PARAMETERS: handle - Object handle (optional)
156 * pathname - Object pathname (optional)
157 * external_params - List of parameters to pass to method,
158 * terminated by NULL. May be NULL
159 * if no parameters are being passed.
160 * return_buffer - Where to put method's return value (if
161 * any). If NULL, no value is returned.
165 * DESCRIPTION: Find and evaluate the given object, passing the given
166 * parameters if necessary. One of "Handle" or "Pathname" must
167 * be valid (non-null)
169 ******************************************************************************/
171 acpi_evaluate_object(acpi_handle handle
,
172 acpi_string pathname
,
173 struct acpi_object_list
*external_params
,
174 struct acpi_buffer
*return_buffer
)
177 struct acpi_evaluate_info
*info
;
178 acpi_size buffer_space_needed
;
181 ACPI_FUNCTION_TRACE(acpi_evaluate_object
);
183 /* Allocate and initialize the evaluation information block */
185 info
= ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info
));
187 return_ACPI_STATUS(AE_NO_MEMORY
);
190 /* Convert and validate the device handle */
192 info
->prefix_node
= acpi_ns_validate_handle(handle
);
193 if (!info
->prefix_node
) {
194 status
= AE_BAD_PARAMETER
;
199 * Get the actual namespace node for the target object.
200 * Handles these cases:
202 * 1) Null node, valid pathname from root (absolute path)
203 * 2) Node and valid pathname (path relative to Node)
204 * 3) Node, Null pathname
206 if ((pathname
) && (ACPI_IS_ROOT_PREFIX(pathname
[0]))) {
208 /* The path is fully qualified, just evaluate by name */
210 info
->prefix_node
= NULL
;
211 } else if (!handle
) {
213 * A handle is optional iff a fully qualified pathname is specified.
214 * Since we've already handled fully qualified names above, this is
218 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
219 "Both Handle and Pathname are NULL"));
221 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
222 "Null Handle with relative pathname [%s]",
226 status
= AE_BAD_PARAMETER
;
230 info
->relative_pathname
= pathname
;
233 * Convert all external objects passed as arguments to the
234 * internal version(s).
236 if (external_params
&& external_params
->count
) {
237 info
->param_count
= (u16
)external_params
->count
;
239 /* Warn on impossible argument count */
241 if (info
->param_count
> ACPI_METHOD_NUM_ARGS
) {
242 ACPI_WARN_PREDEFINED((AE_INFO
, pathname
,
244 "Excess arguments (%u) - using only %u",
246 ACPI_METHOD_NUM_ARGS
));
248 info
->param_count
= ACPI_METHOD_NUM_ARGS
;
252 * Allocate a new parameter block for the internal objects
253 * Add 1 to count to allow for null terminated internal list
255 info
->parameters
= ACPI_ALLOCATE_ZEROED(((acpi_size
) info
->
257 1) * sizeof(void *));
258 if (!info
->parameters
) {
259 status
= AE_NO_MEMORY
;
263 /* Convert each external object in the list to an internal object */
265 for (i
= 0; i
< info
->param_count
; i
++) {
267 acpi_ut_copy_eobject_to_iobject(&external_params
->
271 if (ACPI_FAILURE(status
)) {
276 info
->parameters
[info
->param_count
] = NULL
;
282 * Begin incoming argument count analysis. Check for too few args
286 switch (acpi_ns_get_type(info
->node
)) {
287 case ACPI_TYPE_METHOD
:
289 /* Check incoming argument count against the method definition */
291 if (info
->obj_desc
->method
.param_count
> info
->param_count
) {
293 "Insufficient arguments (%u) - %u are required",
295 info
->obj_desc
->method
.param_count
));
297 status
= AE_MISSING_ARGUMENTS
;
301 else if (info
->obj_desc
->method
.param_count
< info
->param_count
) {
302 ACPI_WARNING((AE_INFO
,
303 "Excess arguments (%u) - only %u are required",
305 info
->obj_desc
->method
.param_count
));
307 /* Just pass the required number of arguments */
309 info
->param_count
= info
->obj_desc
->method
.param_count
;
313 * Any incoming external objects to be passed as arguments to the
314 * method must be converted to internal objects
316 if (info
->param_count
) {
318 * Allocate a new parameter block for the internal objects
319 * Add 1 to count to allow for null terminated internal list
321 info
->parameters
= ACPI_ALLOCATE_ZEROED(((acpi_size
)
326 if (!info
->parameters
) {
327 status
= AE_NO_MEMORY
;
331 /* Convert each external object in the list to an internal object */
333 for (i
= 0; i
< info
->param_count
; i
++) {
335 acpi_ut_copy_eobject_to_iobject
336 (&external_params
->pointer
[i
],
337 &info
->parameters
[i
]);
338 if (ACPI_FAILURE(status
)) {
343 info
->parameters
[info
->param_count
] = NULL
;
349 /* Warn if arguments passed to an object that is not a method */
351 if (info
->param_count
) {
352 ACPI_WARNING((AE_INFO
,
353 "%u arguments were passed to a non-method ACPI object",
361 /* Now we can evaluate the object */
363 status
= acpi_ns_evaluate(info
);
366 * If we are expecting a return value, and all went well above,
367 * copy the return value to an external object.
370 if (!info
->return_object
) {
371 return_buffer
->length
= 0;
373 if (ACPI_GET_DESCRIPTOR_TYPE(info
->return_object
) ==
374 ACPI_DESC_TYPE_NAMED
) {
376 * If we received a NS Node as a return object, this means that
377 * the object we are evaluating has nothing interesting to
378 * return (such as a mutex, etc.) We return an error because
379 * these types are essentially unsupported by this interface.
380 * We don't check up front because this makes it easier to add
381 * support for various types at a later date if necessary.
384 info
->return_object
= NULL
; /* No need to delete a NS Node */
385 return_buffer
->length
= 0;
388 if (ACPI_SUCCESS(status
)) {
390 /* Dereference Index and ref_of references */
392 acpi_ns_resolve_references(info
);
394 /* Get the size of the returned object */
397 acpi_ut_get_object_size(info
->return_object
,
398 &buffer_space_needed
);
399 if (ACPI_SUCCESS(status
)) {
401 /* Validate/Allocate/Clear caller buffer */
404 acpi_ut_initialize_buffer
406 buffer_space_needed
);
407 if (ACPI_FAILURE(status
)) {
409 * Caller's buffer is too small or a new one can't
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
413 "Needed buffer size %X, %s\n",
416 acpi_format_exception
419 /* We have enough space for the object, build it */
422 acpi_ut_copy_iobject_to_eobject
423 (info
->return_object
,
431 if (info
->return_object
) {
433 * Delete the internal return object. NOTE: Interpreter must be
434 * locked to avoid race condition.
436 acpi_ex_enter_interpreter();
438 /* Remove one reference on the return object (should delete it) */
440 acpi_ut_remove_reference(info
->return_object
);
441 acpi_ex_exit_interpreter();
446 /* Free the input parameter list (if we created one) */
448 if (info
->parameters
) {
450 /* Free the allocated parameter block */
452 acpi_ut_delete_internal_object_list(info
->parameters
);
456 return_ACPI_STATUS(status
);
459 ACPI_EXPORT_SYMBOL(acpi_evaluate_object
)
461 /*******************************************************************************
463 * FUNCTION: acpi_ns_resolve_references
465 * PARAMETERS: info - Evaluation info block
467 * RETURN: Info->return_object is replaced with the dereferenced object
469 * DESCRIPTION: Dereference certain reference objects. Called before an
470 * internal return object is converted to an external union acpi_object.
472 * Performs an automatic dereference of Index and ref_of reference objects.
473 * These reference objects are not supported by the union acpi_object, so this is a
474 * last resort effort to return something useful. Also, provides compatibility
475 * with other ACPI implementations.
477 * NOTE: does not handle references within returned package objects or nested
478 * references, but this support could be added later if found to be necessary.
480 ******************************************************************************/
481 static void acpi_ns_resolve_references(struct acpi_evaluate_info
*info
)
483 union acpi_operand_object
*obj_desc
= NULL
;
484 struct acpi_namespace_node
*node
;
486 /* We are interested in reference objects only */
488 if ((info
->return_object
)->common
.type
!= ACPI_TYPE_LOCAL_REFERENCE
) {
493 * Two types of references are supported - those created by Index and
494 * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted
495 * to an union acpi_object, so it is not dereferenced here. A ddb_handle
496 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
497 * an union acpi_object.
499 switch (info
->return_object
->reference
.class) {
500 case ACPI_REFCLASS_INDEX
:
502 obj_desc
= *(info
->return_object
->reference
.where
);
505 case ACPI_REFCLASS_REFOF
:
507 node
= info
->return_object
->reference
.object
;
509 obj_desc
= node
->object
;
517 /* Replace the existing reference object */
520 acpi_ut_add_reference(obj_desc
);
521 acpi_ut_remove_reference(info
->return_object
);
522 info
->return_object
= obj_desc
;
528 /*******************************************************************************
530 * FUNCTION: acpi_walk_namespace
532 * PARAMETERS: type - acpi_object_type to search for
533 * start_object - Handle in namespace where search begins
534 * max_depth - Depth to which search is to reach
535 * pre_order_visit - Called during tree pre-order visit
536 * when an object of "Type" is found
537 * post_order_visit - Called during tree post-order visit
538 * when an object of "Type" is found
539 * context - Passed to user function(s) above
540 * return_value - Location where return value of
541 * user_function is put if terminated early
543 * RETURNS Return value from the user_function if terminated early.
544 * Otherwise, returns NULL.
546 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
547 * starting (and ending) at the object specified by start_handle.
548 * The callback function is called whenever an object that matches
549 * the type parameter is found. If the callback function returns
550 * a non-zero value, the search is terminated immediately and this
551 * value is returned to the caller.
553 * The point of this procedure is to provide a generic namespace
554 * walk routine that can be called from multiple places to
555 * provide multiple services; the callback function(s) can be
556 * tailored to each task, whether it is a print function,
557 * a compare function, etc.
559 ******************************************************************************/
562 acpi_walk_namespace(acpi_object_type type
,
563 acpi_handle start_object
,
565 acpi_walk_callback pre_order_visit
,
566 acpi_walk_callback post_order_visit
,
567 void *context
, void **return_value
)
571 ACPI_FUNCTION_TRACE(acpi_walk_namespace
);
573 /* Parameter validation */
575 if ((type
> ACPI_TYPE_LOCAL_MAX
) ||
576 (!max_depth
) || (!pre_order_visit
&& !post_order_visit
)) {
577 return_ACPI_STATUS(AE_BAD_PARAMETER
);
581 * Need to acquire the namespace reader lock to prevent interference
582 * with any concurrent table unloads (which causes the deletion of
583 * namespace objects). We cannot allow the deletion of a namespace node
584 * while the user function is using it. The exception to this are the
585 * nodes created and deleted during control method execution -- these
586 * nodes are marked as temporary nodes and are ignored by the namespace
587 * walk. Thus, control methods can be executed while holding the
588 * namespace deletion lock (and the user function can execute control
591 status
= acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock
);
592 if (ACPI_FAILURE(status
)) {
593 return_ACPI_STATUS(status
);
597 * Lock the namespace around the walk. The namespace will be
598 * unlocked/locked around each call to the user function - since the user
599 * function must be allowed to make ACPICA calls itself (for example, it
600 * will typically execute control methods during device enumeration.)
602 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
603 if (ACPI_FAILURE(status
)) {
604 goto unlock_and_exit
;
607 status
= acpi_ns_walk_namespace(type
, start_object
, max_depth
,
608 ACPI_NS_WALK_UNLOCK
, pre_order_visit
,
609 post_order_visit
, context
,
612 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
615 (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock
);
616 return_ACPI_STATUS(status
);
619 ACPI_EXPORT_SYMBOL(acpi_walk_namespace
)
621 /*******************************************************************************
623 * FUNCTION: acpi_ns_get_device_callback
625 * PARAMETERS: Callback from acpi_get_device
629 * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
630 * present devices, or if they specified a HID, it filters based
633 ******************************************************************************/
635 acpi_ns_get_device_callback(acpi_handle obj_handle
,
637 void *context
, void **return_value
)
639 struct acpi_get_devices_info
*info
= context
;
641 struct acpi_namespace_node
*node
;
643 struct acpi_pnp_device_id
*hid
;
644 struct acpi_pnp_device_id_list
*cid
;
649 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
650 if (ACPI_FAILURE(status
)) {
654 node
= acpi_ns_validate_handle(obj_handle
);
655 status
= acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
656 if (ACPI_FAILURE(status
)) {
661 return (AE_BAD_PARAMETER
);
665 * First, filter based on the device HID and CID.
667 * 01/2010: For this case where a specific HID is requested, we don't
668 * want to run _STA until we have an actual HID match. Thus, we will
669 * not unnecessarily execute _STA on devices for which the caller
670 * doesn't care about. Previously, _STA was executed unconditionally
671 * on all devices found here.
673 * A side-effect of this change is that now we will continue to search
674 * for a matching HID even under device trees where the parent device
675 * would have returned a _STA that indicates it is not present or
676 * not functioning (thus aborting the search on that branch).
678 if (info
->hid
!= NULL
) {
679 status
= acpi_ut_execute_HID(node
, &hid
);
680 if (status
== AE_NOT_FOUND
) {
682 } else if (ACPI_FAILURE(status
)) {
683 return (AE_CTRL_DEPTH
);
686 no_match
= ACPI_STRCMP(hid
->string
, info
->hid
);
691 * HID does not match, attempt match within the
692 * list of Compatible IDs (CIDs)
694 status
= acpi_ut_execute_CID(node
, &cid
);
695 if (status
== AE_NOT_FOUND
) {
697 } else if (ACPI_FAILURE(status
)) {
698 return (AE_CTRL_DEPTH
);
701 /* Walk the CID list */
704 for (i
= 0; i
< cid
->count
; i
++) {
705 if (ACPI_STRCMP(cid
->ids
[i
].string
, info
->hid
)
708 /* Found a matching CID */
722 /* Run _STA to determine if device is present */
724 status
= acpi_ut_execute_STA(node
, &flags
);
725 if (ACPI_FAILURE(status
)) {
726 return (AE_CTRL_DEPTH
);
729 if (!(flags
& ACPI_STA_DEVICE_PRESENT
) &&
730 !(flags
& ACPI_STA_DEVICE_FUNCTIONING
)) {
732 * Don't examine the children of the device only when the
733 * device is neither present nor functional. See ACPI spec,
734 * description of _STA for more information.
736 return (AE_CTRL_DEPTH
);
739 /* We have a valid device, invoke the user function */
741 status
= info
->user_function(obj_handle
, nesting_level
, info
->context
,
746 /*******************************************************************************
748 * FUNCTION: acpi_get_devices
750 * PARAMETERS: HID - HID to search for. Can be NULL.
751 * user_function - Called when a matching object is found
752 * context - Passed to user function
753 * return_value - Location where return value of
754 * user_function is put if terminated early
756 * RETURNS Return value from the user_function if terminated early.
757 * Otherwise, returns NULL.
759 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
760 * starting (and ending) at the object specified by start_handle.
761 * The user_function is called whenever an object of type
762 * Device is found. If the user function returns
763 * a non-zero value, the search is terminated immediately and this
764 * value is returned to the caller.
766 * This is a wrapper for walk_namespace, but the callback performs
767 * additional filtering. Please see acpi_ns_get_device_callback.
769 ******************************************************************************/
772 acpi_get_devices(const char *HID
,
773 acpi_walk_callback user_function
,
774 void *context
, void **return_value
)
777 struct acpi_get_devices_info info
;
779 ACPI_FUNCTION_TRACE(acpi_get_devices
);
781 /* Parameter validation */
783 if (!user_function
) {
784 return_ACPI_STATUS(AE_BAD_PARAMETER
);
788 * We're going to call their callback from OUR callback, so we need
789 * to know what it is, and their context parameter.
792 info
.context
= context
;
793 info
.user_function
= user_function
;
796 * Lock the namespace around the walk.
797 * The namespace will be unlocked/locked around each call
798 * to the user function - since this function
799 * must be allowed to make Acpi calls itself.
801 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
802 if (ACPI_FAILURE(status
)) {
803 return_ACPI_STATUS(status
);
806 status
= acpi_ns_walk_namespace(ACPI_TYPE_DEVICE
, ACPI_ROOT_OBJECT
,
807 ACPI_UINT32_MAX
, ACPI_NS_WALK_UNLOCK
,
808 acpi_ns_get_device_callback
, NULL
,
809 &info
, return_value
);
811 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
812 return_ACPI_STATUS(status
);
815 ACPI_EXPORT_SYMBOL(acpi_get_devices
)
817 /*******************************************************************************
819 * FUNCTION: acpi_attach_data
821 * PARAMETERS: obj_handle - Namespace node
822 * handler - Handler for this attachment
823 * data - Pointer to data to be attached
827 * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
829 ******************************************************************************/
831 acpi_attach_data(acpi_handle obj_handle
,
832 acpi_object_handler handler
, void *data
)
834 struct acpi_namespace_node
*node
;
837 /* Parameter validation */
839 if (!obj_handle
|| !handler
|| !data
) {
840 return (AE_BAD_PARAMETER
);
843 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
844 if (ACPI_FAILURE(status
)) {
848 /* Convert and validate the handle */
850 node
= acpi_ns_validate_handle(obj_handle
);
852 status
= AE_BAD_PARAMETER
;
853 goto unlock_and_exit
;
856 status
= acpi_ns_attach_data(node
, handler
, data
);
859 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
863 ACPI_EXPORT_SYMBOL(acpi_attach_data
)
865 /*******************************************************************************
867 * FUNCTION: acpi_detach_data
869 * PARAMETERS: obj_handle - Namespace node handle
870 * handler - Handler used in call to acpi_attach_data
874 * DESCRIPTION: Remove data that was previously attached to a node.
876 ******************************************************************************/
878 acpi_detach_data(acpi_handle obj_handle
, acpi_object_handler handler
)
880 struct acpi_namespace_node
*node
;
883 /* Parameter validation */
885 if (!obj_handle
|| !handler
) {
886 return (AE_BAD_PARAMETER
);
889 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
890 if (ACPI_FAILURE(status
)) {
894 /* Convert and validate the handle */
896 node
= acpi_ns_validate_handle(obj_handle
);
898 status
= AE_BAD_PARAMETER
;
899 goto unlock_and_exit
;
902 status
= acpi_ns_detach_data(node
, handler
);
905 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
909 ACPI_EXPORT_SYMBOL(acpi_detach_data
)
911 /*******************************************************************************
913 * FUNCTION: acpi_get_data
915 * PARAMETERS: obj_handle - Namespace node
916 * handler - Handler used in call to attach_data
917 * data - Where the data is returned
921 * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
923 ******************************************************************************/
925 acpi_get_data(acpi_handle obj_handle
, acpi_object_handler handler
, void **data
)
927 struct acpi_namespace_node
*node
;
930 /* Parameter validation */
932 if (!obj_handle
|| !handler
|| !data
) {
933 return (AE_BAD_PARAMETER
);
936 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
937 if (ACPI_FAILURE(status
)) {
941 /* Convert and validate the handle */
943 node
= acpi_ns_validate_handle(obj_handle
);
945 status
= AE_BAD_PARAMETER
;
946 goto unlock_and_exit
;
949 status
= acpi_ns_get_attached_data(node
, handler
, data
);
952 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
956 ACPI_EXPORT_SYMBOL(acpi_get_data
)