drivers/acpi/acpica/evgpe.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpe - General Purpose Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evgpe")
  51
  52 /* Local prototypes */
  53 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ev_update_gpe_enable_mask
  58  *
  59  * PARAMETERS:  gpe_event_info          - GPE to update
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Updates GPE register enable mask based upon whether there are
  64  *              runtime references to this GPE
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status
  69 acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
  70 {
  71         struct acpi_gpe_register_info *gpe_register_info;
  72         u32 register_bit;
  73
  74         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);
  75
  76         gpe_register_info = gpe_event_info->register_info;
  77         if (!gpe_register_info) {
  78                 return_ACPI_STATUS(AE_NOT_EXIST);
  79         }
  80
  81         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info,
  82                                                 gpe_register_info);
  83
  84         /* Clear the run bit up front */
  85
  86         ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
  87
  88         /* Set the mask bit only if there are references to this GPE */
  89
  90         if (gpe_event_info->runtime_count) {
  91                 ACPI_SET_BIT(gpe_register_info->enable_for_run, (u8)register_bit);
  92         }
  93
  94         return_ACPI_STATUS(AE_OK);
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_ev_enable_gpe
 100  *
 101  * PARAMETERS:  gpe_event_info  - GPE to enable
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Clear the given GPE from stale events and enable it.
 106  *
 107  ******************************************************************************/
 108 acpi_status
 109 acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 110 {
 111         acpi_status status;
 112
 113         ACPI_FUNCTION_TRACE(ev_enable_gpe);
 114
 115         /*
 116          * We will only allow a GPE to be enabled if it has either an
 117          * associated method (_Lxx/_Exx) or a handler. Otherwise, the
 118          * GPE will be immediately disabled by acpi_ev_gpe_dispatch the
 119          * first time it fires.
 120          */
 121         if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) {
 122                 return_ACPI_STATUS(AE_NO_HANDLER);
 123         }
 124
 125         /* Clear the GPE (of stale events) */
 126         status = acpi_hw_clear_gpe(gpe_event_info);
 127         if (ACPI_FAILURE(status)) {
 128                 return_ACPI_STATUS(status);
 129         }
 130
 131         /* Enable the requested GPE */
 132         status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
 133
 134         return_ACPI_STATUS(status);
 135 }
 136
 137
 138 /*******************************************************************************
 139  *
 140  * FUNCTION:    acpi_ev_add_gpe_reference
 141  *
 142  * PARAMETERS:  gpe_event_info  - GPE to enable
 143  *
 144  * RETURN:      Status
 145  *
 146  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 147  *              hardware-enabled.
 148  *
 149  ******************************************************************************/
 150
 151 acpi_status acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
 152 {
 153         acpi_status status = AE_OK;
 154
 155         ACPI_FUNCTION_TRACE(ev_add_gpe_reference);
 156
 157         if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
 158                 return_ACPI_STATUS(AE_LIMIT);
 159         }
 160
 161         gpe_event_info->runtime_count++;
 162         if (gpe_event_info->runtime_count == 1) {
 163                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 164                 if (ACPI_SUCCESS(status)) {
 165                         status = acpi_ev_enable_gpe(gpe_event_info);
 166                 }
 167
 168                 if (ACPI_FAILURE(status)) {
 169                         gpe_event_info->runtime_count--;
 170                 }
 171         }
 172
 173         return_ACPI_STATUS(status);
 174 }
 175
 176 /*******************************************************************************
 177  *
 178  * FUNCTION:    acpi_ev_remove_gpe_reference
 179  *
 180  * PARAMETERS:  gpe_event_info  - GPE to disable
 181  *
 182  * RETURN:      Status
 183  *
 184  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 185  *              removed, the GPE is hardware-disabled.
 186  *
 187  ******************************************************************************/
 188
 189 acpi_status acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
 190 {
 191         acpi_status status = AE_OK;
 192
 193         ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);
 194
 195         if (!gpe_event_info->runtime_count) {
 196                 return_ACPI_STATUS(AE_LIMIT);
 197         }
 198
 199         gpe_event_info->runtime_count--;
 200         if (!gpe_event_info->runtime_count) {
 201                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 202                 if (ACPI_SUCCESS(status)) {
 203                         status = acpi_hw_low_set_gpe(gpe_event_info,
 204                                                      ACPI_GPE_DISABLE);
 205                 }
 206
 207                 if (ACPI_FAILURE(status)) {
 208                         gpe_event_info->runtime_count++;
 209                 }
 210         }
 211
 212         return_ACPI_STATUS(status);
 213 }
 214
 215 /*******************************************************************************
 216  *
 217  * FUNCTION:    acpi_ev_low_get_gpe_info
 218  *
 219  * PARAMETERS:  gpe_number          - Raw GPE number
 220  *              gpe_block           - A GPE info block
 221  *
 222  * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number
 223  *              is not within the specified GPE block)
 224  *
 225  * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
 226  *              the low-level implementation of ev_get_gpe_event_info.
 227  *
 228  ******************************************************************************/
 229
 230 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
 231                                                      struct acpi_gpe_block_info
 232                                                      *gpe_block)
 233 {
 234         u32 gpe_index;
 235
 236         /*
 237          * Validate that the gpe_number is within the specified gpe_block.
 238          * (Two steps)
 239          */
 240         if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
 241                 return (NULL);
 242         }
 243
 244         gpe_index = gpe_number - gpe_block->block_base_number;
 245         if (gpe_index >= gpe_block->gpe_count) {
 246                 return (NULL);
 247         }
 248
 249         return (&gpe_block->event_info[gpe_index]);
 250 }
 251
 252
 253 /*******************************************************************************
 254  *
 255  * FUNCTION:    acpi_ev_get_gpe_event_info
 256  *
 257  * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 258  *              gpe_number          - Raw GPE number
 259  *
 260  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 261  *
 262  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 263  *              Validates the gpe_block and the gpe_number
 264  *
 265  *              Should be called only when the GPE lists are semaphore locked
 266  *              and not subject to change.
 267  *
 268  ******************************************************************************/
 269
 270 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
 271                                                        u32 gpe_number)
 272 {
 273         union acpi_operand_object *obj_desc;
 274         struct acpi_gpe_event_info *gpe_info;
 275         u32 i;
 276
 277         ACPI_FUNCTION_ENTRY();
 278
 279         /* A NULL gpe_device means use the FADT-defined GPE block(s) */
 280
 281         if (!gpe_device) {
 282
 283                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 284
 285                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 286                         gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
 287                                                             acpi_gbl_gpe_fadt_blocks
 288                                                             [i]);
 289                         if (gpe_info) {
 290                                 return (gpe_info);
 291                         }
 292                 }
 293
 294                 /* The gpe_number was not in the range of either FADT GPE block */
 295
 296                 return (NULL);
 297         }
 298
 299         /* A Non-NULL gpe_device means this is a GPE Block Device */
 300
 301         obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)
 302                                                gpe_device);
 303         if (!obj_desc || !obj_desc->device.gpe_block) {
 304                 return (NULL);
 305         }
 306
 307         return (acpi_ev_low_get_gpe_info
 308                 (gpe_number, obj_desc->device.gpe_block));
 309 }
 310
 311 /*******************************************************************************
 312  *
 313  * FUNCTION:    acpi_ev_gpe_detect
 314  *
 315  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 316  *                                    Can have multiple GPE blocks attached.
 317  *
 318  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 319  *
 320  * DESCRIPTION: Detect if any GP events have occurred. This function is
 321  *              executed at interrupt level.
 322  *
 323  ******************************************************************************/
 324
 325 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 326 {
 327         acpi_status status;
 328         struct acpi_gpe_block_info *gpe_block;
 329         struct acpi_gpe_register_info *gpe_register_info;
 330         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 331         u8 enabled_status_byte;
 332         u32 status_reg;
 333         u32 enable_reg;
 334         acpi_cpu_flags flags;
 335         u32 i;
 336         u32 j;
 337
 338         ACPI_FUNCTION_NAME(ev_gpe_detect);
 339
 340         /* Check for the case where there are no GPEs */
 341
 342         if (!gpe_xrupt_list) {
 343                 return (int_status);
 344         }
 345
 346         /*
 347          * We need to obtain the GPE lock for both the data structs and registers
 348          * Note: Not necessary to obtain the hardware lock, since the GPE
 349          * registers are owned by the gpe_lock.
 350          */
 351         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 352
 353         /* Examine all GPE blocks attached to this interrupt level */
 354
 355         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 356         while (gpe_block) {
 357                 /*
 358                  * Read all of the 8-bit GPE status and enable registers in this GPE
 359                  * block, saving all of them. Find all currently active GP events.
 360                  */
 361                 for (i = 0; i < gpe_block->register_count; i++) {
 362
 363                         /* Get the next status/enable pair */
 364
 365                         gpe_register_info = &gpe_block->register_info[i];
 366
 367                         /* Read the Status Register */
 368
 369                         status =
 370                             acpi_hw_read(&status_reg,
 371                                          &gpe_register_info->status_address);
 372                         if (ACPI_FAILURE(status)) {
 373                                 goto unlock_and_exit;
 374                         }
 375
 376                         /* Read the Enable Register */
 377
 378                         status =
 379                             acpi_hw_read(&enable_reg,
 380                                          &gpe_register_info->enable_address);
 381                         if (ACPI_FAILURE(status)) {
 382                                 goto unlock_and_exit;
 383                         }
 384
 385                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 386                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 387                                           gpe_register_info->base_gpe_number,
 388                                           status_reg, enable_reg));
 389
 390                         /* Check if there is anything active at all in this register */
 391
 392                         enabled_status_byte = (u8) (status_reg & enable_reg);
 393                         if (!enabled_status_byte) {
 394
 395                                 /* No active GPEs in this register, move on */
 396
 397                                 continue;
 398                         }
 399
 400                         /* Now look at the individual GPEs in this byte register */
 401
 402                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 403
 404                                 /* Examine one GPE bit */
 405
 406                                 if (enabled_status_byte & (1 << j)) {
 407                                         /*
 408                                          * Found an active GPE. Dispatch the event to a handler
 409                                          * or method.
 410                                          */
 411                                         int_status |=
 412                                             acpi_ev_gpe_dispatch(&gpe_block->
 413                                                 event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number);
 414                                 }
 415                         }
 416                 }
 417
 418                 gpe_block = gpe_block->next;
 419         }
 420
 421       unlock_and_exit:
 422
 423         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 424         return (int_status);
 425 }
 426
 427 /*******************************************************************************
 428  *
 429  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 430  *
 431  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 432  *
 433  * RETURN:      None
 434  *
 435  * DESCRIPTION: Perform the actual execution of a GPE control method. This
 436  *              function is called from an invocation of acpi_os_execute and
 437  *              therefore does NOT execute at interrupt level - so that
 438  *              the control method itself is not executed in the context of
 439  *              an interrupt handler.
 440  *
 441  ******************************************************************************/
 442 static void acpi_ev_asynch_enable_gpe(void *context);
 443
 444 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
 445 {
 446         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
 447         acpi_status status;
 448         struct acpi_gpe_event_info local_gpe_event_info;
 449         struct acpi_evaluate_info *info;
 450
 451         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
 452
 453         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 454         if (ACPI_FAILURE(status)) {
 455                 return_VOID;
 456         }
 457
 458         /* Must revalidate the gpe_number/gpe_block */
 459
 460         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
 461                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 462                 return_VOID;
 463         }
 464
 465         /*
 466          * Take a snapshot of the GPE info for this level - we copy the info to
 467          * prevent a race condition with remove_handler/remove_block.
 468          */
 469         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
 470                     sizeof(struct acpi_gpe_event_info));
 471
 472         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 473         if (ACPI_FAILURE(status)) {
 474                 return_VOID;
 475         }
 476
 477         /*
 478          * Must check for control method type dispatch one more time to avoid a
 479          * race with ev_gpe_install_handler
 480          */
 481         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 482             ACPI_GPE_DISPATCH_METHOD) {
 483
 484                 /* Allocate the evaluation information block */
 485
 486                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 487                 if (!info) {
 488                         status = AE_NO_MEMORY;
 489                 } else {
 490                         /*
 491                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 492                          * control method that corresponds to this GPE
 493                          */
 494                         info->prefix_node =
 495                             local_gpe_event_info.dispatch.method_node;
 496                         info->flags = ACPI_IGNORE_RETURN_VALUE;
 497
 498                         status = acpi_ns_evaluate(info);
 499                         ACPI_FREE(info);
 500                 }
 501
 502                 if (ACPI_FAILURE(status)) {
 503                         ACPI_EXCEPTION((AE_INFO, status,
 504                                         "while evaluating GPE method [%4.4s]",
 505                                         acpi_ut_get_node_name
 506                                         (local_gpe_event_info.dispatch.
 507                                          method_node)));
 508                 }
 509         }
 510         /* Defer enabling of GPE until all notify handlers are done */
 511         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
 512                                 gpe_event_info);
 513         return_VOID;
 514 }
 515
 516 static void acpi_ev_asynch_enable_gpe(void *context)
 517 {
 518         struct acpi_gpe_event_info *gpe_event_info = context;
 519         acpi_status status;
 520         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 521             ACPI_GPE_LEVEL_TRIGGERED) {
 522                 /*
 523                  * GPE is level-triggered, we clear the GPE status bit after handling
 524                  * the event.
 525                  */
 526                 status = acpi_hw_clear_gpe(gpe_event_info);
 527                 if (ACPI_FAILURE(status)) {
 528                         return_VOID;
 529                 }
 530         }
 531
 532         /*
 533          * Enable this GPE, conditionally. This means that the GPE will only be
 534          * physically enabled if the enable_for_run bit is set in the event_info
 535          */
 536         (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);
 537
 538         return_VOID;
 539 }
 540
 541 /*******************************************************************************
 542  *
 543  * FUNCTION:    acpi_ev_gpe_dispatch
 544  *
 545  * PARAMETERS:  gpe_event_info  - Info for this GPE
 546  *              gpe_number      - Number relative to the parent GPE block
 547  *
 548  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 549  *
 550  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 551  *              or method (e.g. _Lxx/_Exx) handler.
 552  *
 553  *              This function executes at interrupt level.
 554  *
 555  ******************************************************************************/
 556
 557 u32
 558 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
 559 {
 560         acpi_status status;
 561
 562         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
 563
 564         acpi_os_gpe_count(gpe_number);
 565
 566         /*
 567          * If edge-triggered, clear the GPE status bit now. Note that
 568          * level-triggered events are cleared after the GPE is serviced.
 569          */
 570         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 571             ACPI_GPE_EDGE_TRIGGERED) {
 572                 status = acpi_hw_clear_gpe(gpe_event_info);
 573                 if (ACPI_FAILURE(status)) {
 574                         ACPI_EXCEPTION((AE_INFO, status,
 575                                         "Unable to clear GPE[0x%2X]",
 576                                         gpe_number));
 577                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 578                 }
 579         }
 580
 581         /*
 582          * Dispatch the GPE to either an installed handler, or the control method
 583          * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
 584          * it and do not attempt to run the method. If there is neither a handler
 585          * nor a method, we disable this GPE to prevent further such pointless
 586          * events from firing.
 587          */
 588         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 589         case ACPI_GPE_DISPATCH_HANDLER:
 590
 591                 /*
 592                  * Invoke the installed handler (at interrupt level)
 593                  * Ignore return status for now.
 594                  * TBD: leave GPE disabled on error?
 595                  */
 596                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
 597                                                                 dispatch.
 598                                                                 handler->
 599                                                                 context);
 600
 601                 /* It is now safe to clear level-triggered events. */
 602
 603                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 604                     ACPI_GPE_LEVEL_TRIGGERED) {
 605                         status = acpi_hw_clear_gpe(gpe_event_info);
 606                         if (ACPI_FAILURE(status)) {
 607                                 ACPI_EXCEPTION((AE_INFO, status,
 608                                         "Unable to clear GPE[0x%2X]",
 609                                                 gpe_number));
 610                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 611                         }
 612                 }
 613                 break;
 614
 615         case ACPI_GPE_DISPATCH_METHOD:
 616
 617                 /*
 618                  * Disable the GPE, so it doesn't keep firing before the method has a
 619                  * chance to run (it runs asynchronously with interrupts enabled).
 620                  */
 621                 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
 622                 if (ACPI_FAILURE(status)) {
 623                         ACPI_EXCEPTION((AE_INFO, status,
 624                                         "Unable to disable GPE[0x%2X]",
 625                                         gpe_number));
 626                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 627                 }
 628
 629                 /*
 630                  * Execute the method associated with the GPE
 631                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 632                  */
 633                 status = acpi_os_execute(OSL_GPE_HANDLER,
 634                                          acpi_ev_asynch_execute_gpe_method,
 635                                          gpe_event_info);
 636                 if (ACPI_FAILURE(status)) {
 637                         ACPI_EXCEPTION((AE_INFO, status,
 638                                         "Unable to queue handler for GPE[0x%2X] - event disabled",
 639                                         gpe_number));
 640                 }
 641                 break;
 642
 643         default:
 644
 645                 /*
 646                  * No handler or method to run!
 647                  * 03/2010: This case should no longer be possible. We will not allow
 648                  * a GPE to be enabled if it has no handler or method.
 649                  */
 650                 ACPI_ERROR((AE_INFO,
 651                             "No handler or method for GPE[0x%2X], disabling event",
 652                             gpe_number));
 653
 654                 /*
 655                  * Disable the GPE. The GPE will remain disabled a handler
 656                  * is installed or ACPICA is restarted.
 657                  */
 658                 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
 659                 if (ACPI_FAILURE(status)) {
 660                         ACPI_EXCEPTION((AE_INFO, status,
 661                                         "Unable to disable GPE[0x%2X]",
 662                                         gpe_number));
 663                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 664                 }
 665                 break;
 666         }
 667
 668         return_UINT32(ACPI_INTERRUPT_HANDLED);
 669 }