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Subject[189/205] ACPI / ACPICA: Fix low-level GPE manipulation code
2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Rafael J. Wysocki <rjw@sisk.pl>

commit fd247447c1d94a79d5cfc647430784306b3a8323 upstream.

ACPICA uses acpi_ev_enable_gpe() for enabling GPEs at the low level,
which is incorrect, because this function only enables the GPE if the
corresponding bit in its enable register's enable_for_run mask is set.
This causes acpi_set_gpe() to work incorrectly if used for enabling
GPEs that were not previously enabled with acpi_enable_gpe(). As a
result, among other things, wakeup-only GPEs are never enabled by
acpi_enable_wakeup_device(), so the devices that use them are unable
to wake up the system.

To fix this issue remove acpi_ev_enable_gpe() and its counterpart
acpi_ev_disable_gpe() and replace acpi_hw_low_disable_gpe() with
acpi_hw_low_set_gpe() that will be used instead to manipulate GPE
enable bits at the low level. Make the users of acpi_ev_enable_gpe()
and acpi_ev_disable_gpe() call acpi_hw_low_set_gpe() instead and
make sure that GPE enable masks are only updated by acpi_enable_gpe()
and acpi_disable_gpe() when GPE reference counters change from 0
to 1 and from 1 to 0, respectively.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


---
drivers/acpi/acpica/acevents.h | 4 --
drivers/acpi/acpica/achware.h | 3 +
drivers/acpi/acpica/evgpe.c | 78 +----------------------------------------
drivers/acpi/acpica/evxfevnt.c | 66 ++++++++++++++++++++++++++++++----
drivers/acpi/acpica/hwgpe.c | 26 +++++++++++--
include/acpi/acexcep.h | 2 -
6 files changed, 84 insertions(+), 95 deletions(-)
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -78,10 +78,6 @@ acpi_ev_queue_notify_request(struct acpi
acpi_status
acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info);

-acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info);
-
-acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info);
-
struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
u32 gpe_number);

--- a/drivers/acpi/acpica/achware.h
+++ b/drivers/acpi/acpica/achware.h
@@ -93,7 +93,8 @@ acpi_status acpi_hw_write_port(acpi_io_a
u32 acpi_hw_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info,
struct acpi_gpe_register_info *gpe_register_info);

-acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info);
+acpi_status
+acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 action);

acpi_status
acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info *gpe_event_info);
--- a/drivers/acpi/acpica/evgpe.c
+++ b/drivers/acpi/acpica/evgpe.c
@@ -94,76 +94,6 @@ acpi_ev_update_gpe_enable_masks(struct a

/*******************************************************************************
*
- * FUNCTION: acpi_ev_enable_gpe
- *
- * PARAMETERS: gpe_event_info - GPE to enable
- *
- * RETURN: Status
- *
- * DESCRIPTION: Enable a GPE based on the GPE type
- *
- ******************************************************************************/
-
-acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
-{
- acpi_status status;
-
- ACPI_FUNCTION_TRACE(ev_enable_gpe);
-
- /* Make sure HW enable masks are updated */
-
- status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
- if (ACPI_FAILURE(status))
- return_ACPI_STATUS(status);
-
- /* Clear the GPE (of stale events), then enable it */
- status = acpi_hw_clear_gpe(gpe_event_info);
- if (ACPI_FAILURE(status))
- return_ACPI_STATUS(status);
-
- /* Enable the requested GPE */
- status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
- return_ACPI_STATUS(status);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_ev_disable_gpe
- *
- * PARAMETERS: gpe_event_info - GPE to disable
- *
- * RETURN: Status
- *
- * DESCRIPTION: Disable a GPE based on the GPE type
- *
- ******************************************************************************/
-
-acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
-{
- acpi_status status;
-
- ACPI_FUNCTION_TRACE(ev_disable_gpe);
-
- /* Make sure HW enable masks are updated */
-
- status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
- if (ACPI_FAILURE(status))
- return_ACPI_STATUS(status);
-
- /*
- * 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);
-}
-
-/*******************************************************************************
- *
* FUNCTION: acpi_ev_get_gpe_event_info
*
* PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
@@ -388,10 +318,6 @@ static void ACPI_SYSTEM_XFACE acpi_ev_as
return_VOID;
}

- /* Set the GPE flags for return to enabled state */
-
- (void)acpi_ev_update_gpe_enable_masks(gpe_event_info);
-
/*
* Take a snapshot of the GPE info for this level - we copy the info to
* prevent a race condition with remove_handler/remove_block.
@@ -544,7 +470,7 @@ acpi_ev_gpe_dispatch(struct acpi_gpe_eve
* Disable the GPE, so it doesn't keep firing before the method has a
* chance to run (it runs asynchronously with interrupts enabled).
*/
- status = acpi_ev_disable_gpe(gpe_event_info);
+ status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Unable to disable GPE[%2X]",
@@ -578,7 +504,7 @@ acpi_ev_gpe_dispatch(struct acpi_gpe_eve
* Disable the GPE. The GPE will remain disabled until the ACPICA
* Core Subsystem is restarted, or a handler is installed.
*/
- status = acpi_ev_disable_gpe(gpe_event_info);
+ status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Unable to disable GPE[%2X]",
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -201,6 +201,44 @@ ACPI_EXPORT_SYMBOL(acpi_enable_event)

/*******************************************************************************
*
+ * FUNCTION: acpi_clear_and_enable_gpe
+ *
+ * PARAMETERS: gpe_event_info - GPE to enable
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Clear the given GPE from stale events and enable it.
+ *
+ ******************************************************************************/
+static acpi_status
+acpi_clear_and_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
+{
+ acpi_status status;
+
+ /*
+ * We will only allow a GPE to be enabled if it has either an
+ * associated method (_Lxx/_Exx) or a handler. Otherwise, the
+ * GPE will be immediately disabled by acpi_ev_gpe_dispatch the
+ * first time it fires.
+ */
+ if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) {
+ return_ACPI_STATUS(AE_NO_HANDLER);
+ }
+
+ /* Clear the GPE (of stale events) */
+ status = acpi_hw_clear_gpe(gpe_event_info);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Enable the requested GPE */
+ status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
* FUNCTION: acpi_set_gpe
*
* PARAMETERS: gpe_device - Parent GPE Device
@@ -235,11 +273,11 @@ acpi_status acpi_set_gpe(acpi_handle gpe

switch (action) {
case ACPI_GPE_ENABLE:
- status = acpi_ev_enable_gpe(gpe_event_info);
+ status = acpi_clear_and_enable_gpe(gpe_event_info);
break;

case ACPI_GPE_DISABLE:
- status = acpi_ev_disable_gpe(gpe_event_info);
+ status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
break;

default:
@@ -291,9 +329,13 @@ acpi_status acpi_enable_gpe(acpi_handle

if (type & ACPI_GPE_TYPE_RUNTIME) {
if (++gpe_event_info->runtime_count == 1) {
- status = acpi_ev_enable_gpe(gpe_event_info);
- if (ACPI_FAILURE(status))
+ status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
+ if (ACPI_SUCCESS(status)) {
+ status = acpi_clear_and_enable_gpe(gpe_event_info);
+ }
+ if (ACPI_FAILURE(status)) {
gpe_event_info->runtime_count--;
+ }
}
}

@@ -308,7 +350,7 @@ acpi_status acpi_enable_gpe(acpi_handle
* system into a sleep state.
*/
if (++gpe_event_info->wakeup_count == 1)
- acpi_ev_update_gpe_enable_masks(gpe_event_info);
+ status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
}

unlock_and_exit:
@@ -351,8 +393,16 @@ acpi_status acpi_disable_gpe(acpi_handle
}

if ((type & ACPI_GPE_TYPE_RUNTIME) && gpe_event_info->runtime_count) {
- if (--gpe_event_info->runtime_count == 0)
- status = acpi_ev_disable_gpe(gpe_event_info);
+ if (--gpe_event_info->runtime_count == 0) {
+ status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
+ if (ACPI_SUCCESS(status)) {
+ status = acpi_hw_low_set_gpe(gpe_event_info,
+ ACPI_GPE_DISABLE);
+ }
+ if (ACPI_FAILURE(status)) {
+ gpe_event_info->runtime_count++;
+ }
+ }
}

if ((type & ACPI_GPE_TYPE_WAKE) && gpe_event_info->wakeup_count) {
@@ -361,7 +411,7 @@ acpi_status acpi_disable_gpe(acpi_handle
* states, so we don't need to disable them here.
*/
if (--gpe_event_info->wakeup_count == 0)
- acpi_ev_update_gpe_enable_masks(gpe_event_info);
+ status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
}

unlock_and_exit:
--- a/drivers/acpi/acpica/hwgpe.c
+++ b/drivers/acpi/acpica/hwgpe.c
@@ -78,23 +78,27 @@ u32 acpi_hw_gpe_register_bit(struct acpi

/******************************************************************************
*
- * FUNCTION: acpi_hw_low_disable_gpe
+ * FUNCTION: acpi_hw_low_set_gpe
*
* PARAMETERS: gpe_event_info - Info block for the GPE to be disabled
+ * action - Enable or disable
*
* RETURN: Status
*
- * DESCRIPTION: Disable a single GPE in the enable register.
+ * DESCRIPTION: Enable or disable a single GPE in its enable register.
*
******************************************************************************/

-acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
+acpi_status
+acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 action)
{
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
u32 enable_mask;
u32 register_bit;

+ ACPI_FUNCTION_ENTRY();
+
/* Get the info block for the entire GPE register */

gpe_register_info = gpe_event_info->register_info;
@@ -109,11 +113,23 @@ acpi_status acpi_hw_low_disable_gpe(stru
return (status);
}

- /* Clear just the bit that corresponds to this GPE */
+ /* Set or clear just the bit that corresponds to this GPE */

register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
gpe_register_info);
- ACPI_CLEAR_BIT(enable_mask, register_bit);
+ switch (action) {
+ case ACPI_GPE_ENABLE:
+ ACPI_SET_BIT(enable_mask, register_bit);
+ break;
+
+ case ACPI_GPE_DISABLE:
+ ACPI_CLEAR_BIT(enable_mask, register_bit);
+ break;
+
+ default:
+ ACPI_ERROR((AE_INFO, "Invalid action\n"));
+ return (AE_BAD_PARAMETER);
+ }

/* Write the updated enable mask */

--- a/include/acpi/acexcep.h
+++ b/include/acpi/acexcep.h
@@ -87,7 +87,7 @@
#define AE_NO_GLOBAL_LOCK (acpi_status) (0x0017 | AE_CODE_ENVIRONMENTAL)
#define AE_ABORT_METHOD (acpi_status) (0x0018 | AE_CODE_ENVIRONMENTAL)
#define AE_SAME_HANDLER (acpi_status) (0x0019 | AE_CODE_ENVIRONMENTAL)
-#define AE_WAKE_ONLY_GPE (acpi_status) (0x001A | AE_CODE_ENVIRONMENTAL)
+#define AE_NO_HANDLER (acpi_status) (0x001A | AE_CODE_ENVIRONMENTAL)
#define AE_OWNER_ID_LIMIT (acpi_status) (0x001B | AE_CODE_ENVIRONMENTAL)

#define AE_CODE_ENV_MAX 0x001B



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