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ACPICA: Use spinlock for acpi_{en|dis}able_gpe
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Disabling gpe might interfere with gpe detection/handling,
thus producing "interrupt not handled" errors.
Ironically, disabling of GPE from interrupt context is already
under spinlock, so only userspace needs to start using it.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
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Alexey Starikovskiy authored and Len Brown committed Nov 11, 2008
1 parent a2f93ae commit 0b7084a
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Showing 6 changed files with 23 additions and 40 deletions.
2 changes: 1 addition & 1 deletion drivers/acpi/button.c
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Original file line number Diff line number Diff line change
Expand Up @@ -479,7 +479,7 @@ static int acpi_button_add(struct acpi_device *device)
device->wakeup.gpe_number,
ACPI_GPE_TYPE_WAKE_RUN);
acpi_enable_gpe(device->wakeup.gpe_device,
device->wakeup.gpe_number, ACPI_NOT_ISR);
device->wakeup.gpe_number);
device->wakeup.state.enabled = 1;
}

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10 changes: 5 additions & 5 deletions drivers/acpi/ec.c
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Original file line number Diff line number Diff line change
Expand Up @@ -282,7 +282,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
/* disable GPE during transaction if storm is detected */
if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
acpi_disable_gpe(NULL, ec->gpe);
}
/* start transaction */
spin_lock_irqsave(&ec->curr_lock, tmp);
Expand All @@ -305,7 +305,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
/* check if we received SCI during transaction */
ec_check_sci(ec, acpi_ec_read_status(ec));
/* it is safe to enable GPE outside of transaction */
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
acpi_enable_gpe(NULL, ec->gpe);
} else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
t->irq_count > ACPI_EC_STORM_THRESHOLD) {
pr_info(PREFIX "GPE storm detected, "
Expand Down Expand Up @@ -897,7 +897,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
if (ACPI_FAILURE(status))
return -ENODEV;
acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
acpi_enable_gpe(NULL, ec->gpe);
status = acpi_install_address_space_handler(ec->handle,
ACPI_ADR_SPACE_EC,
&acpi_ec_space_handler,
Expand Down Expand Up @@ -1036,7 +1036,7 @@ static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
/* Stop using GPE */
set_bit(EC_FLAGS_NO_GPE, &ec->flags);
clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
acpi_disable_gpe(NULL, ec->gpe);
return 0;
}

Expand All @@ -1045,7 +1045,7 @@ static int acpi_ec_resume(struct acpi_device *device)
struct acpi_ec *ec = acpi_driver_data(device);
/* Enable use of GPE back */
clear_bit(EC_FLAGS_NO_GPE, &ec->flags);
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
acpi_enable_gpe(NULL, ec->gpe);
return 0;
}

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35 changes: 9 additions & 26 deletions drivers/acpi/events/evxfevnt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -248,21 +248,15 @@ ACPI_EXPORT_SYMBOL(acpi_set_gpe_type)
* DESCRIPTION: Enable an ACPI event (general purpose)
*
******************************************************************************/
acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
{
acpi_status status = AE_OK;
acpi_cpu_flags flags;
struct acpi_gpe_event_info *gpe_event_info;

ACPI_FUNCTION_TRACE(acpi_enable_gpe);

/* Use semaphore lock if not executing at interrupt level */

if (flags & ACPI_NOT_ISR) {
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 */

Expand All @@ -277,9 +271,7 @@ acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
status = acpi_ev_enable_gpe(gpe_event_info, TRUE);

unlock_and_exit:
if (flags & ACPI_NOT_ISR) {
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
}
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return_ACPI_STATUS(status);
}

Expand All @@ -299,22 +291,15 @@ ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
* DESCRIPTION: Disable an ACPI event (general purpose)
*
******************************************************************************/
acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
{
acpi_status status = AE_OK;
acpi_cpu_flags flags;
struct acpi_gpe_event_info *gpe_event_info;

ACPI_FUNCTION_TRACE(acpi_disable_gpe);

/* Use semaphore lock if not executing at interrupt level */

if (flags & ACPI_NOT_ISR) {
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);
Expand All @@ -325,10 +310,8 @@ acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)

status = acpi_ev_disable_gpe(gpe_event_info);

unlock_and_exit:
if (flags & ACPI_NOT_ISR) {
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
}
unlock_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return_ACPI_STATUS(status);
}

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8 changes: 4 additions & 4 deletions drivers/acpi/sleep/wakeup.c
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Original file line number Diff line number Diff line change
Expand Up @@ -88,7 +88,7 @@ void acpi_enable_wakeup_device(u8 sleep_state)
spin_unlock(&acpi_device_lock);
if (!dev->wakeup.flags.run_wake)
acpi_enable_gpe(dev->wakeup.gpe_device,
dev->wakeup.gpe_number, ACPI_ISR);
dev->wakeup.gpe_number);
spin_lock(&acpi_device_lock);
}
spin_unlock(&acpi_device_lock);
Expand Down Expand Up @@ -122,7 +122,7 @@ void acpi_disable_wakeup_device(u8 sleep_state)
ACPI_GPE_TYPE_WAKE_RUN);
/* Re-enable it, since set_gpe_type will disable it */
acpi_enable_gpe(dev->wakeup.gpe_device,
dev->wakeup.gpe_number, ACPI_NOT_ISR);
dev->wakeup.gpe_number);
spin_lock(&acpi_device_lock);
}
continue;
Expand All @@ -133,7 +133,7 @@ void acpi_disable_wakeup_device(u8 sleep_state)
/* Never disable run-wake GPE */
if (!dev->wakeup.flags.run_wake) {
acpi_disable_gpe(dev->wakeup.gpe_device,
dev->wakeup.gpe_number, ACPI_NOT_ISR);
dev->wakeup.gpe_number);
acpi_clear_gpe(dev->wakeup.gpe_device,
dev->wakeup.gpe_number, ACPI_NOT_ISR);
}
Expand Down Expand Up @@ -162,7 +162,7 @@ static int __init acpi_wakeup_device_init(void)
dev->wakeup.gpe_number,
ACPI_GPE_TYPE_WAKE_RUN);
acpi_enable_gpe(dev->wakeup.gpe_device,
dev->wakeup.gpe_number, ACPI_NOT_ISR);
dev->wakeup.gpe_number);
dev->wakeup.state.enabled = 1;
spin_lock(&acpi_device_lock);
}
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4 changes: 2 additions & 2 deletions drivers/acpi/system.c
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Original file line number Diff line number Diff line change
Expand Up @@ -394,10 +394,10 @@ static ssize_t counter_set(struct kobject *kobj,
if (index < num_gpes) {
if (!strcmp(buf, "disable\n") &&
(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_disable_gpe(handle, index, ACPI_NOT_ISR);
result = acpi_disable_gpe(handle, index);
else if (!strcmp(buf, "enable\n") &&
!(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_enable_gpe(handle, index, ACPI_NOT_ISR);
result = acpi_enable_gpe(handle, index);
else if (!strcmp(buf, "clear\n") &&
(status & ACPI_EVENT_FLAG_SET))
result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
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4 changes: 2 additions & 2 deletions include/acpi/acpixf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -252,9 +252,9 @@ acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status);

acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type);

acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags);
acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number);

acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags);
acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number);

acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags);

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