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 - 2006, 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 <linux/module.h>
  46
  47 #include <acpi/acpi.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acinterp.h>
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52 ACPI_MODULE_NAME("nsxfeval")
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_evaluate_object_typed
  57  *
  58  * PARAMETERS:  Handle              - Object handle (optional)
  59  *              Pathname            - Object pathname (optional)
  60  *              external_params     - List of parameters to pass to method,
  61  *                                    terminated by NULL.  May be NULL
  62  *                                    if no parameters are being passed.
  63  *              return_buffer       - Where to put method's return value (if
  64  *                                    any).  If NULL, no value is returned.
  65  *              return_type         - Expected type of return object
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Find and evaluate the given object, passing the given
  70  *              parameters if necessary.  One of "Handle" or "Pathname" must
  71  *              be valid (non-null)
  72  *
  73  ******************************************************************************/
  74 #ifdef ACPI_FUTURE_USAGE
  75 acpi_status
  76 acpi_evaluate_object_typed(acpi_handle handle,
  77                            acpi_string pathname,
  78                            struct acpi_object_list *external_params,
  79                            struct acpi_buffer *return_buffer,
  80                            acpi_object_type return_type)
  81 {
  82         acpi_status status;
  83         u8 must_free = FALSE;
  84
  85         ACPI_FUNCTION_TRACE("acpi_evaluate_object_typed");
  86
  87         /* Return buffer must be valid */
  88
  89         if (!return_buffer) {
  90                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  91         }
  92
  93         if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
  94                 must_free = TRUE;
  95         }
  96
  97         /* Evaluate the object */
  98
  99         status =
 100             acpi_evaluate_object(handle, pathname, external_params,
 101                                  return_buffer);
 102         if (ACPI_FAILURE(status)) {
 103                 return_ACPI_STATUS(status);
 104         }
 105
 106         /* Type ANY means "don't care" */
 107
 108         if (return_type == ACPI_TYPE_ANY) {
 109                 return_ACPI_STATUS(AE_OK);
 110         }
 111
 112         if (return_buffer->length == 0) {
 113                 /* Error because caller specifically asked for a return value */
 114
 115                 ACPI_ERROR((AE_INFO, "No return value"));
 116                 return_ACPI_STATUS(AE_NULL_OBJECT);
 117         }
 118
 119         /* Examine the object type returned from evaluate_object */
 120
 121         if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
 122                 return_ACPI_STATUS(AE_OK);
 123         }
 124
 125         /* Return object type does not match requested type */
 126
 127         ACPI_ERROR((AE_INFO,
 128                     "Incorrect return type [%s] requested [%s]",
 129                     acpi_ut_get_type_name(((union acpi_object *)return_buffer->
 130                                            pointer)->type),
 131                     acpi_ut_get_type_name(return_type)));
 132
 133         if (must_free) {
 134                 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
 135
 136                 acpi_os_free(return_buffer->pointer);
 137                 return_buffer->pointer = NULL;
 138         }
 139
 140         return_buffer->length = 0;
 141         return_ACPI_STATUS(AE_TYPE);
 142 }
 143 #endif                          /*  ACPI_FUTURE_USAGE  */
 144
 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
 165 acpi_status
 166 acpi_evaluate_object(acpi_handle handle,
 167                      acpi_string pathname,
 168                      struct acpi_object_list *external_params,
 169                      struct acpi_buffer *return_buffer)
 170 {
 171         acpi_status status;
 172         acpi_status status2;
 173         struct acpi_parameter_info info;
 174         acpi_size buffer_space_needed;
 175         u32 i;
 176
 177         ACPI_FUNCTION_TRACE("acpi_evaluate_object");
 178
 179         info.node = handle;
 180         info.parameters = NULL;
 181         info.return_object = NULL;
 182         info.parameter_type = ACPI_PARAM_ARGS;
 183
 184         /*
 185          * If there are parameters to be passed to the object
 186          * (which must be a control method), the external objects
 187          * must be converted to internal objects
 188          */
 189         if (external_params && external_params->count) {
 190                 /*
 191                  * Allocate a new parameter block for the internal objects
 192                  * Add 1 to count to allow for null terminated internal list
 193                  */
 194                 info.parameters = ACPI_MEM_CALLOCATE(((acpi_size)
 195                                                       external_params->count +
 196                                                       1) * sizeof(void *));
 197                 if (!info.parameters) {
 198                         return_ACPI_STATUS(AE_NO_MEMORY);
 199                 }
 200
 201                 /*
 202                  * Convert each external object in the list to an
 203                  * internal object
 204                  */
 205                 for (i = 0; i < external_params->count; i++) {
 206                         status =
 207                             acpi_ut_copy_eobject_to_iobject(&external_params->
 208                                                             pointer[i],
 209                                                             &info.
 210                                                             parameters[i]);
 211                         if (ACPI_FAILURE(status)) {
 212                                 acpi_ut_delete_internal_object_list(info.
 213                                                                     parameters);
 214                                 return_ACPI_STATUS(status);
 215                         }
 216                 }
 217                 info.parameters[external_params->count] = NULL;
 218         }
 219
 220         /*
 221          * Three major cases:
 222          * 1) Fully qualified pathname
 223          * 2) No handle, not fully qualified pathname (error)
 224          * 3) Valid handle
 225          */
 226         if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) {
 227                 /*
 228                  *  The path is fully qualified, just evaluate by name
 229                  */
 230                 status = acpi_ns_evaluate_by_name(pathname, &info);
 231         } else if (!handle) {
 232                 /*
 233                  * A handle is optional iff a fully qualified pathname
 234                  * is specified.  Since we've already handled fully
 235                  * qualified names above, this is an error
 236                  */
 237                 if (!pathname) {
 238                         ACPI_ERROR((AE_INFO,
 239                                     "Both Handle and Pathname are NULL"));
 240                 } else {
 241                         ACPI_ERROR((AE_INFO,
 242                                     "Handle is NULL and Pathname is relative"));
 243                 }
 244
 245                 status = AE_BAD_PARAMETER;
 246         } else {
 247                 /*
 248                  * We get here if we have a handle -- and if we have a
 249                  * pathname it is relative.  The handle will be validated
 250                  * in the lower procedures
 251                  */
 252                 if (!pathname) {
 253                         /*
 254                          * The null pathname case means the handle is for
 255                          * the actual object to be evaluated
 256                          */
 257                         status = acpi_ns_evaluate_by_handle(&info);
 258                 } else {
 259                         /*
 260                          * Both a Handle and a relative Pathname
 261                          */
 262                         status = acpi_ns_evaluate_relative(pathname, &info);
 263                 }
 264         }
 265
 266         /*
 267          * If we are expecting a return value, and all went well above,
 268          * copy the return value to an external object.
 269          */
 270         if (return_buffer) {
 271                 if (!info.return_object) {
 272                         return_buffer->length = 0;
 273                 } else {
 274                         if (ACPI_GET_DESCRIPTOR_TYPE(info.return_object) ==
 275                             ACPI_DESC_TYPE_NAMED) {
 276                                 /*
 277                                  * If we received a NS Node as a return object, this means that
 278                                  * the object we are evaluating has nothing interesting to
 279                                  * return (such as a mutex, etc.)  We return an error because
 280                                  * these types are essentially unsupported by this interface.
 281                                  * We don't check up front because this makes it easier to add
 282                                  * support for various types at a later date if necessary.
 283                                  */
 284                                 status = AE_TYPE;
 285                                 info.return_object = NULL;      /* No need to delete a NS Node */
 286                                 return_buffer->length = 0;
 287                         }
 288
 289                         if (ACPI_SUCCESS(status)) {
 290                                 /*
 291                                  * Find out how large a buffer is needed
 292                                  * to contain the returned object
 293                                  */
 294                                 status =
 295                                     acpi_ut_get_object_size(info.return_object,
 296                                                             &buffer_space_needed);
 297                                 if (ACPI_SUCCESS(status)) {
 298                                         /* Validate/Allocate/Clear caller buffer */
 299
 300                                         status =
 301                                             acpi_ut_initialize_buffer
 302                                             (return_buffer,
 303                                              buffer_space_needed);
 304                                         if (ACPI_FAILURE(status)) {
 305                                                 /*
 306                                                  * Caller's buffer is too small or a new one can't 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                                                 /*
 316                                                  *  We have enough space for the object, build it
 317                                                  */
 318                                                 status =
 319                                                     acpi_ut_copy_iobject_to_eobject
 320                                                     (info.return_object,
 321                                                      return_buffer);
 322                                         }
 323                                 }
 324                         }
 325                 }
 326         }
 327
 328         if (info.return_object) {
 329                 /*
 330                  * Delete the internal return object.  NOTE: Interpreter
 331                  * must be locked to avoid race condition.
 332                  */
 333                 status2 = acpi_ex_enter_interpreter();
 334                 if (ACPI_SUCCESS(status2)) {
 335                         /*
 336                          * Delete the internal return object. (Or at least
 337                          * decrement the reference count by one)
 338                          */
 339                         acpi_ut_remove_reference(info.return_object);
 340                         acpi_ex_exit_interpreter();
 341                 }
 342         }
 343
 344         /*
 345          * Free the input parameter list (if we created one),
 346          */
 347         if (info.parameters) {
 348                 /* Free the allocated parameter block */
 349
 350                 acpi_ut_delete_internal_object_list(info.parameters);
 351         }
 352
 353         return_ACPI_STATUS(status);
 354 }
 355
 356 EXPORT_SYMBOL(acpi_evaluate_object);
 357
 358 /*******************************************************************************
 359  *
 360  * FUNCTION:    acpi_walk_namespace
 361  *
 362  * PARAMETERS:  Type                - acpi_object_type to search for
 363  *              start_object        - Handle in namespace where search begins
 364  *              max_depth           - Depth to which search is to reach
 365  *              user_function       - Called when an object of "Type" is found
 366  *              Context             - Passed to user function
 367  *              return_value        - Location where return value of
 368  *                                    user_function is put if terminated early
 369  *
 370  * RETURNS      Return value from the user_function if terminated early.
 371  *              Otherwise, returns NULL.
 372  *
 373  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
 374  *              starting (and ending) at the object specified by start_handle.
 375  *              The user_function is called whenever an object that matches
 376  *              the type parameter is found.  If the user function returns
 377  *              a non-zero value, the search is terminated immediately and this
 378  *              value is returned to the caller.
 379  *
 380  *              The point of this procedure is to provide a generic namespace
 381  *              walk routine that can be called from multiple places to
 382  *              provide multiple services;  the User Function can be tailored
 383  *              to each task, whether it is a print function, a compare
 384  *              function, etc.
 385  *
 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 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
 440 static acpi_status
 441 acpi_ns_get_device_callback(acpi_handle obj_handle,
 442                             u32 nesting_level,
 443                             void *context, void **return_value)
 444 {
 445         struct acpi_get_devices_info *info = context;
 446         acpi_status status;
 447         struct acpi_namespace_node *node;
 448         u32 flags;
 449         struct acpi_device_id hid;
 450         struct acpi_compatible_id_list *cid;
 451         acpi_native_uint i;
 452
 453         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 454         if (ACPI_FAILURE(status)) {
 455                 return (status);
 456         }
 457
 458         node = acpi_ns_map_handle_to_node(obj_handle);
 459         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 460         if (ACPI_FAILURE(status)) {
 461                 return (status);
 462         }
 463
 464         if (!node) {
 465                 return (AE_BAD_PARAMETER);
 466         }
 467
 468         /* Run _STA to determine if device is present */
 469
 470         status = acpi_ut_execute_STA(node, &flags);
 471         if (ACPI_FAILURE(status)) {
 472                 return (AE_CTRL_DEPTH);
 473         }
 474
 475         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
 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                         /* Get the list of Compatible IDs */
 493
 494                         status = acpi_ut_execute_CID(node, &cid);
 495                         if (status == AE_NOT_FOUND) {
 496                                 return (AE_OK);
 497                         } else if (ACPI_FAILURE(status)) {
 498                                 return (AE_CTRL_DEPTH);
 499                         }
 500
 501                         /* Walk the CID list */
 502
 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                                         ACPI_MEM_FREE(cid);
 509                                         return (AE_OK);
 510                                 }
 511                         }
 512                         ACPI_MEM_FREE(cid);
 513                 }
 514         }
 515
 516         status = info->user_function(obj_handle, nesting_level, info->context,
 517                                      return_value);
 518         return (status);
 519 }
 520
 521 /*******************************************************************************
 522  *
 523  * FUNCTION:    acpi_get_devices
 524  *
 525  * PARAMETERS:  HID                 - HID to search for. Can be NULL.
 526  *              user_function       - Called when a matching object is found
 527  *              Context             - Passed to user function
 528  *              return_value        - Location where return value of
 529  *                                    user_function is put if terminated early
 530  *
 531  * RETURNS      Return value from the user_function if terminated early.
 532  *              Otherwise, returns NULL.
 533  *
 534  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
 535  *              starting (and ending) at the object specified by start_handle.
 536  *              The user_function is called whenever an object of type
 537  *              Device is found.  If the user function returns
 538  *              a non-zero value, the search is terminated immediately and this
 539  *              value is returned to the caller.
 540  *
 541  *              This is a wrapper for walk_namespace, but the callback performs
 542  *              additional filtering. Please see acpi_get_device_callback.
 543  *
 544  ******************************************************************************/
 545
 546 acpi_status
 547 acpi_get_devices(char *HID,
 548                  acpi_walk_callback user_function,
 549                  void *context, void **return_value)
 550 {
 551         acpi_status status;
 552         struct acpi_get_devices_info info;
 553
 554         ACPI_FUNCTION_TRACE("acpi_get_devices");
 555
 556         /* Parameter validation */
 557
 558         if (!user_function) {
 559                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 560         }
 561
 562         /*
 563          * We're going to call their callback from OUR callback, so we need
 564          * to know what it is, and their context parameter.
 565          */
 566         info.context = context;
 567         info.user_function = user_function;
 568         info.hid = HID;
 569
 570         /*
 571          * Lock the namespace around the walk.
 572          * The namespace will be unlocked/locked around each call
 573          * to the user function - since this function
 574          * must be allowed to make Acpi calls itself.
 575          */
 576         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 577         if (ACPI_FAILURE(status)) {
 578                 return_ACPI_STATUS(status);
 579         }
 580
 581         status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE,
 582                                         ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
 583                                         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 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
 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 /*******************************************************************************
 641  *
 642  * FUNCTION:    acpi_detach_data
 643  *
 644  * PARAMETERS:  obj_handle          - Namespace node handle
 645  *              Handler             - Handler used in call to acpi_attach_data
 646  *
 647  * RETURN:      Status
 648  *
 649  * DESCRIPTION: Remove data that was previously attached to a node.
 650  *
 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 /*******************************************************************************
 686  *
 687  * FUNCTION:    acpi_get_data
 688  *
 689  * PARAMETERS:  obj_handle          - Namespace node
 690  *              Handler             - Handler used in call to attach_data
 691  *              Data                - Where the data is returned
 692  *
 693  * RETURN:      Status
 694  *
 695  * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
 696  *
 697  ******************************************************************************/
 698
 699 acpi_status
 700 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
 701 {
 702         struct acpi_namespace_node *node;
 703         acpi_status status;
 704
 705         /* Parameter validation */
 706
 707         if (!obj_handle || !handler || !data) {
 708                 return (AE_BAD_PARAMETER);
 709         }
 710
 711         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 712         if (ACPI_FAILURE(status)) {
 713                 return (status);
 714         }
 715
 716         /* Convert and validate the handle */
 717
 718         node = acpi_ns_map_handle_to_node(obj_handle);
 719         if (!node) {
 720                 status = AE_BAD_PARAMETER;
 721                 goto unlock_and_exit;
 722         }
 723
 724         status = acpi_ns_get_attached_data(node, handler, data);
 725
 726       unlock_and_exit:
 727         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 728         return (status);
 729 }