1
linux/drivers/acpi/acpica/evxface.c
Lv Zheng 3e8214e5c2 ACPICA: Cleanup indentation to reduce differences between Linux and ACPICA.
This is a cosmetic patch only. Comparison of the resulting binary showed
only line number differences.

This patch does not affect the generation of the Linux binary.
This patch decreases 210 lines of 20121018 divergence.diff.

The ACPICA source codes uses a totally different indentation style from the
Linux to be compatible with other users (operating systems or BIOS).

Indentation differences are critical to the release automation. There are
two causes related to the "indentation" that are affecting the release
automation:
1. The ACPICA -> Linux release process is:
     ACPICA source -- acpisrc - hierarchy - indent ->
     linuxized ACPICA source -- diff ->
     linuxized ACPICA patch (x) -- human intervention ->
     linuxized ACPICA patch (o)
     Where
       'x' means "cannot be directly applied to the Linux"
       'o' means "can be directly applied to the Linux"
   Different "indent" version or "indent" options used in the "indent"
   step will lead to different divergences.
   The version of "indent" used for the current release process is:
     GNU indent 2.2.11
   The options of "indent" used for the current release process is:
     -npro -kr -i8 -ts8 -sob -l80 -ss -ncs
2. Manual indentation prettifying work in the Linux side will also harm the
   automatically generated linuxized ACPICA patches, making them impossible
   to apply directly.

This patch fixes source code differences caused by the two causes so that
the "human intervention" can be reduced in the future.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-01-10 12:36:18 +01:00

841 lines
24 KiB
C

/******************************************************************************
*
* Module Name: evxface - External interfaces for ACPI events
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2012, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <linux/export.h>
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acevents.h"
#include "acinterp.h"
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME("evxface")
/*******************************************************************************
*
* FUNCTION: acpi_install_notify_handler
*
* PARAMETERS: device - The device for which notifies will be handled
* handler_type - The type of handler:
* ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
* ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
* ACPI_ALL_NOTIFY: Both System and Device
* handler - Address of the handler
* context - Value passed to the handler on each GPE
*
* RETURN: Status
*
* DESCRIPTION: Install a handler for notifications on an ACPI Device,
* thermal_zone, or Processor object.
*
* NOTES: The Root namespace object may have only one handler for each
* type of notify (System/Device). Device/Thermal/Processor objects
* may have one device notify handler, and multiple system notify
* handlers.
*
******************************************************************************/
acpi_status
acpi_install_notify_handler(acpi_handle device,
u32 handler_type,
acpi_notify_handler handler, void *context)
{
struct acpi_namespace_node *node =
ACPI_CAST_PTR(struct acpi_namespace_node, device);
union acpi_operand_object *obj_desc;
union acpi_operand_object *handler_obj;
acpi_status status;
u32 i;
ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
/* Parameter validation */
if ((!device) || (!handler) || (!handler_type) ||
(handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Root Object:
* Registering a notify handler on the root object indicates that the
* caller wishes to receive notifications for all objects. Note that
* only one global handler can be registered per notify type.
* Ensure that a handler is not already installed.
*/
if (device == ACPI_ROOT_OBJECT) {
for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
if (handler_type & (i + 1)) {
if (acpi_gbl_global_notify[i].handler) {
status = AE_ALREADY_EXISTS;
goto unlock_and_exit;
}
acpi_gbl_global_notify[i].handler = handler;
acpi_gbl_global_notify[i].context = context;
}
}
goto unlock_and_exit; /* Global notify handler installed, all done */
}
/*
* All Other Objects:
* Caller will only receive notifications specific to the target
* object. Note that only certain object types are allowed to
* receive notifications.
*/
/* Are Notifies allowed on this object? */
if (!acpi_ev_is_notify_object(node)) {
status = AE_TYPE;
goto unlock_and_exit;
}
/* Check for an existing internal object, might not exist */
obj_desc = acpi_ns_get_attached_object(node);
if (!obj_desc) {
/* Create a new object */
obj_desc = acpi_ut_create_internal_object(node->type);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/* Attach new object to the Node, remove local reference */
status = acpi_ns_attach_object(device, obj_desc, node->type);
acpi_ut_remove_reference(obj_desc);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
}
/* Ensure that the handler is not already installed in the lists */
for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
if (handler_type & (i + 1)) {
handler_obj = obj_desc->common_notify.notify_list[i];
while (handler_obj) {
if (handler_obj->notify.handler == handler) {
status = AE_ALREADY_EXISTS;
goto unlock_and_exit;
}
handler_obj = handler_obj->notify.next[i];
}
}
}
/* Create and populate a new notify handler object */
handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
if (!handler_obj) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
handler_obj->notify.node = node;
handler_obj->notify.handler_type = handler_type;
handler_obj->notify.handler = handler;
handler_obj->notify.context = context;
/* Install the handler at the list head(s) */
for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
if (handler_type & (i + 1)) {
handler_obj->notify.next[i] =
obj_desc->common_notify.notify_list[i];
obj_desc->common_notify.notify_list[i] = handler_obj;
}
}
/* Add an extra reference if handler was installed in both lists */
if (handler_type == ACPI_ALL_NOTIFY) {
acpi_ut_add_reference(handler_obj);
}
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
/*******************************************************************************
*
* FUNCTION: acpi_remove_notify_handler
*
* PARAMETERS: device - The device for which the handler is installed
* handler_type - The type of handler:
* ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
* ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
* ACPI_ALL_NOTIFY: Both System and Device
* handler - Address of the handler
*
* RETURN: Status
*
* DESCRIPTION: Remove a handler for notifies on an ACPI device
*
******************************************************************************/
acpi_status
acpi_remove_notify_handler(acpi_handle device,
u32 handler_type, acpi_notify_handler handler)
{
struct acpi_namespace_node *node =
ACPI_CAST_PTR(struct acpi_namespace_node, device);
union acpi_operand_object *obj_desc;
union acpi_operand_object *handler_obj;
union acpi_operand_object *previous_handler_obj;
acpi_status status;
u32 i;
ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
/* Parameter validation */
if ((!device) || (!handler) || (!handler_type) ||
(handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Make sure all deferred notify tasks are completed */
acpi_os_wait_events_complete();
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Root Object. Global handlers are removed here */
if (device == ACPI_ROOT_OBJECT) {
for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
if (handler_type & (i + 1)) {
if (!acpi_gbl_global_notify[i].handler ||
(acpi_gbl_global_notify[i].handler !=
handler)) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Removing global notify handler\n"));
acpi_gbl_global_notify[i].handler = NULL;
acpi_gbl_global_notify[i].context = NULL;
}
}
goto unlock_and_exit;
}
/* All other objects: Are Notifies allowed on this object? */
if (!acpi_ev_is_notify_object(node)) {
status = AE_TYPE;
goto unlock_and_exit;
}
/* Must have an existing internal object */
obj_desc = acpi_ns_get_attached_object(node);
if (!obj_desc) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
/* Internal object exists. Find the handler and remove it */
for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
if (handler_type & (i + 1)) {
handler_obj = obj_desc->common_notify.notify_list[i];
previous_handler_obj = NULL;
/* Attempt to find the handler in the handler list */
while (handler_obj &&
(handler_obj->notify.handler != handler)) {
previous_handler_obj = handler_obj;
handler_obj = handler_obj->notify.next[i];
}
if (!handler_obj) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
/* Remove the handler object from the list */
if (previous_handler_obj) { /* Handler is not at the list head */
previous_handler_obj->notify.next[i] =
handler_obj->notify.next[i];
} else { /* Handler is at the list head */
obj_desc->common_notify.notify_list[i] =
handler_obj->notify.next[i];
}
acpi_ut_remove_reference(handler_obj);
}
}
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
/*******************************************************************************
*
* FUNCTION: acpi_install_exception_handler
*
* PARAMETERS: handler - Pointer to the handler function for the
* event
*
* RETURN: Status
*
* DESCRIPTION: Saves the pointer to the handler function
*
******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Don't allow two handlers. */
if (acpi_gbl_exception_handler) {
status = AE_ALREADY_EXISTS;
goto cleanup;
}
/* Install the handler */
acpi_gbl_exception_handler = handler;
cleanup:
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
#endif /* ACPI_FUTURE_USAGE */
#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
*
* FUNCTION: acpi_install_global_event_handler
*
* PARAMETERS: handler - Pointer to the global event handler function
* context - Value passed to the handler on each event
*
* RETURN: Status
*
* DESCRIPTION: Saves the pointer to the handler function. The global handler
* is invoked upon each incoming GPE and Fixed Event. It is
* invoked at interrupt level at the time of the event dispatch.
* Can be used to update event counters, etc.
*
******************************************************************************/
acpi_status
acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
/* Parameter validation */
if (!handler) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Don't allow two handlers. */
if (acpi_gbl_global_event_handler) {
status = AE_ALREADY_EXISTS;
goto cleanup;
}
acpi_gbl_global_event_handler = handler;
acpi_gbl_global_event_handler_context = context;
cleanup:
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
/*******************************************************************************
*
* FUNCTION: acpi_install_fixed_event_handler
*
* PARAMETERS: event - Event type to enable.
* handler - Pointer to the handler function for the
* event
* context - Value passed to the handler on each GPE
*
* RETURN: Status
*
* DESCRIPTION: Saves the pointer to the handler function and then enables the
* event.
*
******************************************************************************/
acpi_status
acpi_install_fixed_event_handler(u32 event,
acpi_event_handler handler, void *context)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
/* Parameter validation */
if (event > ACPI_EVENT_MAX) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Don't allow two handlers. */
if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
status = AE_ALREADY_EXISTS;
goto cleanup;
}
/* Install the handler before enabling the event */
acpi_gbl_fixed_event_handlers[event].handler = handler;
acpi_gbl_fixed_event_handlers[event].context = context;
status = acpi_clear_event(event);
if (ACPI_SUCCESS(status))
status = acpi_enable_event(event, 0);
if (ACPI_FAILURE(status)) {
ACPI_WARNING((AE_INFO, "Could not enable fixed event 0x%X",
event));
/* Remove the handler */
acpi_gbl_fixed_event_handlers[event].handler = NULL;
acpi_gbl_fixed_event_handlers[event].context = NULL;
} else {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Enabled fixed event %X, Handler=%p\n", event,
handler));
}
cleanup:
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
/*******************************************************************************
*
* FUNCTION: acpi_remove_fixed_event_handler
*
* PARAMETERS: event - Event type to disable.
* handler - Address of the handler
*
* RETURN: Status
*
* DESCRIPTION: Disables the event and unregisters the event handler.
*
******************************************************************************/
acpi_status
acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
/* Parameter validation */
if (event > ACPI_EVENT_MAX) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Disable the event before removing the handler */
status = acpi_disable_event(event, 0);
/* Always Remove the handler */
acpi_gbl_fixed_event_handlers[event].handler = NULL;
acpi_gbl_fixed_event_handlers[event].context = NULL;
if (ACPI_FAILURE(status)) {
ACPI_WARNING((AE_INFO,
"Could not write to fixed event enable register 0x%X",
event));
} else {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n",
event));
}
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
/*******************************************************************************
*
* FUNCTION: acpi_install_gpe_handler
*
* PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
* defined GPEs)
* gpe_number - The GPE number within the GPE block
* type - Whether this GPE should be treated as an
* edge- or level-triggered interrupt.
* address - Address of the handler
* context - Value passed to the handler on each GPE
*
* RETURN: Status
*
* DESCRIPTION: Install a handler for a General Purpose Event.
*
******************************************************************************/
acpi_status
acpi_install_gpe_handler(acpi_handle gpe_device,
u32 gpe_number,
u32 type, acpi_gpe_handler address, void *context)
{
struct acpi_gpe_event_info *gpe_event_info;
struct acpi_gpe_handler_info *handler;
acpi_status status;
acpi_cpu_flags flags;
ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
/* Parameter validation */
if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Allocate and init handler object (before lock) */
handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
if (!handler) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
/* Ensure that we have a valid GPE number */
gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
if (!gpe_event_info) {
status = AE_BAD_PARAMETER;
goto free_and_exit;
}
/* Make sure that there isn't a handler there already */
if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
ACPI_GPE_DISPATCH_HANDLER) {
status = AE_ALREADY_EXISTS;
goto free_and_exit;
}
handler->address = address;
handler->context = context;
handler->method_node = gpe_event_info->dispatch.method_node;
handler->original_flags = (u8)(gpe_event_info->flags &
(ACPI_GPE_XRUPT_TYPE_MASK |
ACPI_GPE_DISPATCH_MASK));
/*
* If the GPE is associated with a method, it may have been enabled
* automatically during initialization, in which case it has to be
* disabled now to avoid spurious execution of the handler.
*/
if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
&& gpe_event_info->runtime_count) {
handler->originally_enabled = 1;
(void)acpi_ev_remove_gpe_reference(gpe_event_info);
}
/* Install the handler */
gpe_event_info->dispatch.handler = handler;
/* Setup up dispatch flags to indicate handler (vs. method/notify) */
gpe_event_info->flags &=
~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
free_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
ACPI_FREE(handler);
goto unlock_and_exit;
}
ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
/*******************************************************************************
*
* FUNCTION: acpi_remove_gpe_handler
*
* PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
* defined GPEs)
* gpe_number - The event to remove a handler
* address - Address of the handler
*
* RETURN: Status
*
* DESCRIPTION: Remove a handler for a General Purpose acpi_event.
*
******************************************************************************/
acpi_status
acpi_remove_gpe_handler(acpi_handle gpe_device,
u32 gpe_number, acpi_gpe_handler address)
{
struct acpi_gpe_event_info *gpe_event_info;
struct acpi_gpe_handler_info *handler;
acpi_status status;
acpi_cpu_flags flags;
ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
/* Parameter validation */
if (!address) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Make sure all deferred GPE tasks are completed */
acpi_os_wait_events_complete();
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
/* Ensure that we have a valid GPE number */
gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
if (!gpe_event_info) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Make sure that a handler is indeed installed */
if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
ACPI_GPE_DISPATCH_HANDLER) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
/* Make sure that the installed handler is the same */
if (gpe_event_info->dispatch.handler->address != address) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Remove the handler */
handler = gpe_event_info->dispatch.handler;
/* Restore Method node (if any), set dispatch flags */
gpe_event_info->dispatch.method_node = handler->method_node;
gpe_event_info->flags &=
~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
gpe_event_info->flags |= handler->original_flags;
/*
* If the GPE was previously associated with a method and it was
* enabled, it should be enabled at this point to restore the
* post-initialization configuration.
*/
if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) &&
handler->originally_enabled) {
(void)acpi_ev_add_gpe_reference(gpe_event_info);
}
/* Now we can free the handler object */
ACPI_FREE(handler);
unlock_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
/*******************************************************************************
*
* FUNCTION: acpi_acquire_global_lock
*
* PARAMETERS: timeout - How long the caller is willing to wait
* handle - Where the handle to the lock is returned
* (if acquired)
*
* RETURN: Status
*
* DESCRIPTION: Acquire the ACPI Global Lock
*
* Note: Allows callers with the same thread ID to acquire the global lock
* multiple times. In other words, externally, the behavior of the global lock
* is identical to an AML mutex. On the first acquire, a new handle is
* returned. On any subsequent calls to acquire by the same thread, the same
* handle is returned.
*
******************************************************************************/
acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
{
acpi_status status;
if (!handle) {
return (AE_BAD_PARAMETER);
}
/* Must lock interpreter to prevent race conditions */
acpi_ex_enter_interpreter();
status = acpi_ex_acquire_mutex_object(timeout,
acpi_gbl_global_lock_mutex,
acpi_os_get_thread_id());
if (ACPI_SUCCESS(status)) {
/* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
*handle = acpi_gbl_global_lock_handle;
}
acpi_ex_exit_interpreter();
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
/*******************************************************************************
*
* FUNCTION: acpi_release_global_lock
*
* PARAMETERS: handle - Returned from acpi_acquire_global_lock
*
* RETURN: Status
*
* DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
*
******************************************************************************/
acpi_status acpi_release_global_lock(u32 handle)
{
acpi_status status;
if (!handle || (handle != acpi_gbl_global_lock_handle)) {
return (AE_NOT_ACQUIRED);
}
status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
#endif /* !ACPI_REDUCED_HARDWARE */