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