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Make GPE disable more robust

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Implemented another change for the GPE disable. We now perform a
read-change-write of the enable register instead of simply writing out the
cached enable mask. This will prevent inadvertent enabling of GPEs if a rogue
GPE is received during initialization (before GPE handlers are installed.)

http://bugzilla.kernel.org/show_bug.cgi?id=6217

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Bob Moore 2008-06-13 08:28:55 +08:00 committed by Andi Kleen
parent 87dc5e3218
commit e38e8a0743
3 changed files with 65 additions and 5 deletions
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18
drivers/acpi/events/evgpe.c
View File

@ -256,7 +256,7 @@ acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
return_ACPI_STATUS(status);
}
/* Mark wake-disabled or HW disable, or both */
/* Clear the appropriate enabled flags for this GPE */
switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
case ACPI_GPE_TYPE_WAKE:
@ -273,13 +273,23 @@ acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
/* Disable the requested runtime GPE */
ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
/* fallthrough */
break;
default:
acpi_hw_write_gpe_enable_reg(gpe_event_info);
break;
}
/*
* Even if we don't know the GPE type, make sure that we always
* disable it. low_disable_gpe will just clear the enable bit for this
* GPE and write it. It will not write out the current GPE enable mask,
* since this may inadvertently enable GPEs too early, if a rogue GPE has
* come in during ACPICA initialization - possibly as a result of AML or
* other code that has enabled the GPE.
*/
status = acpi_hw_low_disable_gpe(gpe_event_info);
return_ACPI_STATUS(status);
return_ACPI_STATUS(AE_OK);
}

50
drivers/acpi/hardware/hwgpe.c
View File

@ -53,6 +53,54 @@ static acpi_status
acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block);
/******************************************************************************
*
* FUNCTION: acpi_hw_low_disable_gpe
*
* PARAMETERS: gpe_event_info - Info block for the GPE to be disabled
*
* RETURN: Status
*
* DESCRIPTION: Disable a single GPE in the enable register.
*
******************************************************************************/
acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
u32 enable_mask;
/* Get the info block for the entire GPE register */
gpe_register_info = gpe_event_info->register_info;
if (!gpe_register_info) {
return (AE_NOT_EXIST);
}
/* Get current value of the enable register that contains this GPE */
status = acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH, &enable_mask,
&gpe_register_info->enable_address);
if (ACPI_FAILURE(status)) {
return (status);
}
/* Clear just the bit that corresponds to this GPE */
ACPI_CLEAR_BIT(enable_mask,
((u32) 1 <<
(gpe_event_info->gpe_number -
gpe_register_info->base_gpe_number)));
/* Write the updated enable mask */
status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, enable_mask,
&gpe_register_info->enable_address);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_write_gpe_enable_reg
@ -68,7 +116,7 @@ acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
******************************************************************************/
acpi_status
acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info *gpe_event_info)
acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info * gpe_event_info)
{
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;

2
include/acpi/achware.h
View File

@ -87,6 +87,8 @@ acpi_status acpi_hw_clear_acpi_status(void);
/*
* hwgpe - GPE support
*/
acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info);
acpi_status
acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info *gpe_event_info);