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ACPICA: Drop acpi_set_gpe

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The acpi_set_gpe() function is a little awkward, because it doesn't
really work as advertised in the "disable" case.  Namely, if a GPE
has been enabled with acpi_enable_gpe() and triggered a notification
to occur, and if acpi_set_gpe() is used to disable it before
acpi_ev_asynch_enable_gpe() runs, the GPE will be immediately enabled
by the latter as though the acpi_set_gpe() had no effect.

Thus, since it's been possible to make all of its callers use
alternative operations to disable or enable GPEs, acpi_set_gpe() can
be dropped.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2010-07-01 11:07:20 +08:00 committed by Len Brown
parent 3bd741bd0d
commit 546eb57695
3 changed files with 1 additions and 63 deletions
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60
drivers/acpi/acpica/evxfevnt.c
View File

@ -208,66 +208,6 @@ acpi_status acpi_enable_event(u32 event, u32 flags)
ACPI_EXPORT_SYMBOL(acpi_enable_event)
/*******************************************************************************
*
* FUNCTION: acpi_set_gpe
*
* PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
* gpe_number - GPE level within the GPE block
* action - ACPI_GPE_ENABLE or ACPI_GPE_DISABLE
*
* RETURN: Status
*
* DESCRIPTION: Enable or disable an individual GPE. This function bypasses
* the reference count mechanism used in the acpi_enable_gpe and
* acpi_disable_gpe interfaces -- and should be used with care.
*
* Note: Typically used to disable a runtime GPE for short period of time,
* then re-enable it, without disturbing the existing reference counts. This
* is useful, for example, in the Embedded Controller (EC) driver.
*
******************************************************************************/
acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
{
struct acpi_gpe_event_info *gpe_event_info;
acpi_status status;
acpi_cpu_flags flags;
ACPI_FUNCTION_TRACE(acpi_set_gpe);
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;
}
/* Perform the action */
switch (action) {
case ACPI_GPE_ENABLE:
status = acpi_ev_enable_gpe(gpe_event_info);
break;
case ACPI_GPE_DISABLE:
status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
break;
default:
status = AE_BAD_PARAMETER;
break;
}
unlock_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_set_gpe)
/*******************************************************************************
*
* FUNCTION: acpi_gpe_wakeup

2
include/acpi/acpixf.h
View File

@ -282,8 +282,6 @@ acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status);
/*
* GPE Interfaces
*/
acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action);
acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number);
acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number);

2
include/acpi/actypes.h
View File

@ -663,7 +663,7 @@ typedef u32 acpi_event_status;
#define ACPI_GPE_MAX 0xFF
#define ACPI_NUM_GPE 256
/* Actions for acpi_set_gpe, acpi_gpe_wakeup, acpi_hw_low_set_gpe */
/* Actions for acpi_gpe_wakeup, acpi_hw_low_set_gpe */
#define ACPI_GPE_ENABLE 0
#define ACPI_GPE_DISABLE 1