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
 114                 /* Error because caller specifically asked for a return value */
 115
 116                 ACPI_ERROR((AE_INFO, "No return value"));
 117                 return_ACPI_STATUS(AE_NULL_OBJECT);
 118         }
 119
 120         /* Examine the object type returned from evaluate_object */
 121
 122         if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
 123                 return_ACPI_STATUS(AE_OK);
 124         }
 125
 126         /* Return object type does not match requested type */
 127
 128         ACPI_ERROR((AE_INFO,
 129                     "Incorrect return type [%s] requested [%s]",
 130                     acpi_ut_get_type_name(((union acpi_object *)return_buffer->
 131                                            pointer)->type),
 132                     acpi_ut_get_type_name(return_type)));
 133
 134         if (must_free) {
 135
 136                 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
 137
 138                 acpi_os_free(return_buffer->pointer);
 139                 return_buffer->pointer = NULL;
 140         }
 141
 142         return_buffer->length = 0;
 143         return_ACPI_STATUS(AE_TYPE);
 144 }
 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
 167 acpi_status
 168 acpi_evaluate_object(acpi_handle handle,
 169                      acpi_string pathname,
 170                      struct acpi_object_list *external_params,
 171                      struct acpi_buffer *return_buffer)
 172 {
 173         acpi_status status;
 174         acpi_status status2;
 175         struct acpi_parameter_info info;
 176         acpi_size buffer_space_needed;
 177         u32 i;
 178
 179         ACPI_FUNCTION_TRACE("acpi_evaluate_object");
 180
 181         info.node = handle;
 182         info.parameters = NULL;
 183         info.return_object = NULL;
 184         info.parameter_type = ACPI_PARAM_ARGS;
 185
 186         /*
 187          * If there are parameters to be passed to the object
 188          * (which must be a control method), the external objects
 189          * must be converted to internal objects
 190          */
 191         if (external_params && external_params->count) {
 192                 /*
 193                  * Allocate a new parameter block for the internal objects
 194                  * Add 1 to count to allow for null terminated internal list
 195                  */
 196                 info.parameters = ACPI_MEM_CALLOCATE(((acpi_size)
 197                                                       external_params->count +
 198                                                       1) * sizeof(void *));
 199                 if (!info.parameters) {
 200                         return_ACPI_STATUS(AE_NO_MEMORY);
 201                 }
 202
 203                 /*
 204                  * Convert each external object in the list to an
 205                  * internal object
 206                  */
 207                 for (i = 0; i < external_params->count; i++) {
 208                         status =
 209                             acpi_ut_copy_eobject_to_iobject(&external_params->
 210                                                             pointer[i],
 211                                                             &info.
 212                                                             parameters[i]);
 213                         if (ACPI_FAILURE(status)) {
 214                                 acpi_ut_delete_internal_object_list(info.
 215                                                                     parameters);
 216                                 return_ACPI_STATUS(status);
 217                         }
 218                 }
 219                 info.parameters[external_params->count] = NULL;
 220         }
 221
 222         /*
 223          * Three major cases:
 224          * 1) Fully qualified pathname
 225          * 2) No handle, not fully qualified pathname (error)
 226          * 3) Valid handle
 227          */
 228         if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) {
 229
 230                 /* The path is fully qualified, just evaluate by name */
 231
 232                 status = acpi_ns_evaluate_by_name(pathname, &info);
 233         } else if (!handle) {
 234                 /*
 235                  * A handle is optional iff a fully qualified pathname
 236                  * is specified.  Since we've already handled fully
 237                  * qualified names above, this is an error
 238                  */
 239                 if (!pathname) {
 240                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 241                                           "Both Handle and Pathname are NULL"));
 242                 } else {
 243                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 244                                           "Null Handle with relative pathname [%s]",
 245                                           pathname));
 246                 }
 247
 248                 status = AE_BAD_PARAMETER;
 249         } else {
 250                 /*
 251                  * We get here if we have a handle -- and if we have a
 252                  * pathname it is relative.  The handle will be validated
 253                  * in the lower procedures
 254                  */
 255                 if (!pathname) {
 256                         /*
 257                          * The null pathname case means the handle is for
 258                          * the actual object to be evaluated
 259                          */
 260                         status = acpi_ns_evaluate_by_handle(&info);
 261                 } else {
 262                         /* Both a Handle and a relative Pathname */
 263
 264                         status = acpi_ns_evaluate_relative(pathname, &info);
 265                 }
 266         }
 267
 268         /*
 269          * If we are expecting a return value, and all went well above,
 270          * copy the return value to an external object.
 271          */
 272         if (return_buffer) {
 273                 if (!info.return_object) {
 274                         return_buffer->length = 0;
 275                 } else {
 276                         if (ACPI_GET_DESCRIPTOR_TYPE(info.return_object) ==
 277                             ACPI_DESC_TYPE_NAMED) {
 278                                 /*
 279                                  * If we received a NS Node as a return object, this means that
 280                                  * the object we are evaluating has nothing interesting to
 281                                  * return (such as a mutex, etc.)  We return an error because
 282                                  * these types are essentially unsupported by this interface.
 283                                  * We don't check up front because this makes it easier to add
 284                                  * support for various types at a later date if necessary.
 285                                  */
 286                                 status = AE_TYPE;
 287                                 info.return_object = NULL;      /* No need to delete a NS Node */
 288                                 return_buffer->length = 0;
 289                         }
 290
 291                         if (ACPI_SUCCESS(status)) {
 292                                 /*
 293                                  * Find out how large a buffer is needed
 294                                  * to contain the returned object
 295                                  */
 296                                 status =
 297                                     acpi_ut_get_object_size(info.return_object,
 298                                                             &buffer_space_needed);
 299                                 if (ACPI_SUCCESS(status)) {
 300
 301                                         /* Validate/Allocate/Clear caller buffer */
 302
 303                                         status =
 304                                             acpi_ut_initialize_buffer
 305                                             (return_buffer,
 306                                              buffer_space_needed);
 307                                         if (ACPI_FAILURE(status)) {
 308                                                 /*
 309                                                  * Caller's buffer is too small or a new one can't
 310                                                  * be allocated
 311                                                  */
 312                                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 313                                                                   "Needed buffer size %X, %s\n",
 314                                                                   (u32)
 315                                                                   buffer_space_needed,
 316                                                                   acpi_format_exception
 317                                                                   (status)));
 318                                         } else {
 319                                                 /* We have enough space for the object, build it */
 320
 321                                                 status =
 322                                                     acpi_ut_copy_iobject_to_eobject
 323                                                     (info.return_object,
 324                                                      return_buffer);
 325                                         }
 326                                 }
 327                         }
 328                 }
 329         }
 330
 331         if (info.return_object) {
 332                 /*
 333                  * Delete the internal return object.  NOTE: Interpreter
 334                  * must be locked to avoid race condition.
 335                  */
 336                 status2 = acpi_ex_enter_interpreter();
 337                 if (ACPI_SUCCESS(status2)) {
 338                         /*
 339                          * Delete the internal return object. (Or at least
 340                          * decrement the reference count by one)
 341                          */
 342                         acpi_ut_remove_reference(info.return_object);
 343                         acpi_ex_exit_interpreter();
 344                 }
 345         }
 346
 347         /* Free the input parameter list (if we created one) */
 348
 349         if (info.parameters) {
 350
 351                 /* Free the allocated parameter block */
 352
 353                 acpi_ut_delete_internal_object_list(info.parameters);
 354         }
 355
 356         return_ACPI_STATUS(status);
 357 }
 358
 359 EXPORT_SYMBOL(acpi_evaluate_object);
 360
 361 /*******************************************************************************
 362  *
 363  * FUNCTION:    acpi_walk_namespace
 364  *
 365  * PARAMETERS:  Type                - acpi_object_type to search for
 366  *              start_object        - Handle in namespace where search begins
 367  *              max_depth           - Depth to which search is to reach
 368  *              user_function       - Called when an object of "Type" is found
 369  *              Context             - Passed to user function
 370  *              return_value        - Location where return value of
 371  *                                    user_function is put if terminated early
 372  *
 373  * RETURNS      Return value from the user_function if terminated early.
 374  *              Otherwise, returns NULL.
 375  *
 376  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
 377  *              starting (and ending) at the object specified by start_handle.
 378  *              The user_function is called whenever an object that matches
 379  *              the type parameter is found.  If the user function returns
 380  *              a non-zero value, the search is terminated immediately and this
 381  *              value is returned to the caller.
 382  *
 383  *              The point of this procedure is to provide a generic namespace
 384  *              walk routine that can be called from multiple places to
 385  *              provide multiple services;  the User Function can be tailored
 386  *              to each task, whether it is a print function, a compare
 387  *              function, etc.
 388  *
 389  ******************************************************************************/
 390
 391 acpi_status
 392 acpi_walk_namespace(acpi_object_type type,
 393                     acpi_handle start_object,
 394                     u32 max_depth,
 395                     acpi_walk_callback user_function,
 396                     void *context, void **return_value)
 397 {
 398         acpi_status status;
 399
 400         ACPI_FUNCTION_TRACE("acpi_walk_namespace");
 401
 402         /* Parameter validation */
 403
 404         if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) {
 405                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 406         }
 407
 408         /*
 409          * Lock the namespace around the walk.
 410          * The namespace will be unlocked/locked around each call
 411          * to the user function - since this function
 412          * must be allowed to make Acpi calls itself.
 413          */
 414         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 415         if (ACPI_FAILURE(status)) {
 416                 return_ACPI_STATUS(status);
 417         }
 418
 419         status = acpi_ns_walk_namespace(type, start_object, max_depth,
 420                                         ACPI_NS_WALK_UNLOCK,
 421                                         user_function, context, return_value);
 422
 423         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 424         return_ACPI_STATUS(status);
 425 }
 426
 427 EXPORT_SYMBOL(acpi_walk_namespace);
 428
 429 /*******************************************************************************
 430  *
 431  * FUNCTION:    acpi_ns_get_device_callback
 432  *
 433  * PARAMETERS:  Callback from acpi_get_device
 434  *
 435  * RETURN:      Status
 436  *
 437  * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
 438  *              present devices, or if they specified a HID, it filters based
 439  *              on that.
 440  *
 441  ******************************************************************************/
 442
 443 static acpi_status
 444 acpi_ns_get_device_callback(acpi_handle obj_handle,
 445                             u32 nesting_level,
 446                             void *context, void **return_value)
 447 {
 448         struct acpi_get_devices_info *info = context;
 449         acpi_status status;
 450         struct acpi_namespace_node *node;
 451         u32 flags;
 452         struct acpi_device_id hid;
 453         struct acpi_compatible_id_list *cid;
 454         acpi_native_uint i;
 455
 456         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 457         if (ACPI_FAILURE(status)) {
 458                 return (status);
 459         }
 460
 461         node = acpi_ns_map_handle_to_node(obj_handle);
 462         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 463         if (ACPI_FAILURE(status)) {
 464                 return (status);
 465         }
 466
 467         if (!node) {
 468                 return (AE_BAD_PARAMETER);
 469         }
 470
 471         /* Run _STA to determine if device is present */
 472
 473         status = acpi_ut_execute_STA(node, &flags);
 474         if (ACPI_FAILURE(status)) {
 475                 return (AE_CTRL_DEPTH);
 476         }
 477
 478         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
 479
 480                 /* Don't examine children of the device if not present */
 481
 482                 return (AE_CTRL_DEPTH);
 483         }
 484
 485         /* Filter based on device HID & CID */
 486
 487         if (info->hid != NULL) {
 488                 status = acpi_ut_execute_HID(node, &hid);
 489                 if (status == AE_NOT_FOUND) {
 490                         return (AE_OK);
 491                 } else if (ACPI_FAILURE(status)) {
 492                         return (AE_CTRL_DEPTH);
 493                 }
 494
 495                 if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) {
 496
 497                         /* Get the list of Compatible IDs */
 498
 499                         status = acpi_ut_execute_CID(node, &cid);
 500                         if (status == AE_NOT_FOUND) {
 501                                 return (AE_OK);
 502                         } else if (ACPI_FAILURE(status)) {
 503                                 return (AE_CTRL_DEPTH);
 504                         }
 505
 506                         /* Walk the CID list */
 507
 508                         for (i = 0; i < cid->count; i++) {
 509                                 if (ACPI_STRNCMP(cid->id[i].value, info->hid,
 510                                                  sizeof(struct
 511                                                         acpi_compatible_id)) !=
 512                                     0) {
 513                                         ACPI_MEM_FREE(cid);
 514                                         return (AE_OK);
 515                                 }
 516                         }
 517                         ACPI_MEM_FREE(cid);
 518                 }
 519         }
 520
 521         status = info->user_function(obj_handle, nesting_level, info->context,
 522                                      return_value);
 523         return (status);
 524 }
 525
 526 /*******************************************************************************
 527  *
 528  * FUNCTION:    acpi_get_devices
 529  *
 530  * PARAMETERS:  HID                 - HID to search for. Can be NULL.
 531  *              user_function       - Called when a matching object is found
 532  *              Context             - Passed to user function
 533  *              return_value        - Location where return value of
 534  *                                    user_function is put if terminated early
 535  *
 536  * RETURNS      Return value from the user_function if terminated early.
 537  *              Otherwise, returns NULL.
 538  *
 539  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
 540  *              starting (and ending) at the object specified by start_handle.
 541  *              The user_function is called whenever an object of type
 542  *              Device is found.  If the user function returns
 543  *              a non-zero value, the search is terminated immediately and this
 544  *              value is returned to the caller.
 545  *
 546  *              This is a wrapper for walk_namespace, but the callback performs
 547  *              additional filtering. Please see acpi_get_device_callback.
 548  *
 549  ******************************************************************************/
 550
 551 acpi_status
 552 acpi_get_devices(char *HID,
 553                  acpi_walk_callback user_function,
 554                  void *context, void **return_value)
 555 {
 556         acpi_status status;
 557         struct acpi_get_devices_info info;
 558
 559         ACPI_FUNCTION_TRACE("acpi_get_devices");
 560
 561         /* Parameter validation */
 562
 563         if (!user_function) {
 564                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 565         }
 566
 567         /*
 568          * We're going to call their callback from OUR callback, so we need
 569          * to know what it is, and their context parameter.
 570          */
 571         info.hid = HID;
 572         info.context = context;
 573         info.user_function = user_function;
 574
 575         /*
 576          * Lock the namespace around the walk.
 577          * The namespace will be unlocked/locked around each call
 578          * to the user function - since this function
 579          * must be allowed to make Acpi calls itself.
 580          */
 581         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 582         if (ACPI_FAILURE(status)) {
 583                 return_ACPI_STATUS(status);
 584         }
 585
 586         status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 587                                         ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
 588                                         acpi_ns_get_device_callback, &info,
 589                                         return_value);
 590
 591         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 592         return_ACPI_STATUS(status);
 593 }
 594
 595 EXPORT_SYMBOL(acpi_get_devices);
 596
 597 /*******************************************************************************
 598  *
 599  * FUNCTION:    acpi_attach_data
 600  *
 601  * PARAMETERS:  obj_handle          - Namespace node
 602  *              Handler             - Handler for this attachment
 603  *              Data                - Pointer to data to be attached
 604  *
 605  * RETURN:      Status
 606  *
 607  * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
 608  *
 609  ******************************************************************************/
 610
 611 acpi_status
 612 acpi_attach_data(acpi_handle obj_handle,
 613                  acpi_object_handler handler, void *data)
 614 {
 615         struct acpi_namespace_node *node;
 616         acpi_status status;
 617
 618         /* Parameter validation */
 619
 620         if (!obj_handle || !handler || !data) {
 621                 return (AE_BAD_PARAMETER);
 622         }
 623
 624         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 625         if (ACPI_FAILURE(status)) {
 626                 return (status);
 627         }
 628
 629         /* Convert and validate the handle */
 630
 631         node = acpi_ns_map_handle_to_node(obj_handle);
 632         if (!node) {
 633                 status = AE_BAD_PARAMETER;
 634                 goto unlock_and_exit;
 635         }
 636
 637         status = acpi_ns_attach_data(node, handler, data);
 638
 639       unlock_and_exit:
 640         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 641         return (status);
 642 }
 643
 644 /*******************************************************************************
 645  *
 646  * FUNCTION:    acpi_detach_data
 647  *
 648  * PARAMETERS:  obj_handle          - Namespace node handle
 649  *              Handler             - Handler used in call to acpi_attach_data
 650  *
 651  * RETURN:      Status
 652  *
 653  * DESCRIPTION: Remove data that was previously attached to a node.
 654  *
 655  ******************************************************************************/
 656
 657 acpi_status
 658 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
 659 {
 660         struct acpi_namespace_node *node;
 661         acpi_status status;
 662
 663         /* Parameter validation */
 664
 665         if (!obj_handle || !handler) {
 666                 return (AE_BAD_PARAMETER);
 667         }
 668
 669         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 670         if (ACPI_FAILURE(status)) {
 671                 return (status);
 672         }
 673
 674         /* Convert and validate the handle */
 675
 676         node = acpi_ns_map_handle_to_node(obj_handle);
 677         if (!node) {
 678                 status = AE_BAD_PARAMETER;
 679                 goto unlock_and_exit;
 680         }
 681
 682         status = acpi_ns_detach_data(node, handler);
 683
 684       unlock_and_exit:
 685         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 686         return (status);
 687 }
 688
 689 /*******************************************************************************
 690  *
 691  * FUNCTION:    acpi_get_data
 692  *
 693  * PARAMETERS:  obj_handle          - Namespace node
 694  *              Handler             - Handler used in call to attach_data
 695  *              Data                - Where the data is returned
 696  *
 697  * RETURN:      Status
 698  *
 699  * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
 700  *
 701  ******************************************************************************/
 702
 703 acpi_status
 704 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
 705 {
 706         struct acpi_namespace_node *node;
 707         acpi_status status;
 708
 709         /* Parameter validation */
 710
 711         if (!obj_handle || !handler || !data) {
 712                 return (AE_BAD_PARAMETER);
 713         }
 714
 715         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 716         if (ACPI_FAILURE(status)) {
 717                 return (status);
 718         }
 719
 720         /* Convert and validate the handle */
 721
 722         node = acpi_ns_map_handle_to_node(obj_handle);
 723         if (!node) {
 724                 status = AE_BAD_PARAMETER;
 725                 goto unlock_and_exit;
 726         }
 727
 728         status = acpi_ns_get_attached_data(node, handler, data);
 729
 730       unlock_and_exit:
 731         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 732         return (status);
 733 }