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From: Greg KH on 30 Jul 2010 14:10
2.6.34-stable review patch. If anyone has any objections, please let us know.

------------------

From: Rafael J. Wysocki <rjw(a)sisk.pl>

commit e4e9a735991c80fb0fc1bd4a13a93681c3c17ce0 upstream.

In quite a few places ACPICA needs to compute a GPE enable mask with
only one bit, corresponding to a given GPE, set. Currently, that
computation is always open coded which leads to unnecessary code
duplication. Fix this by introducing a helper function for computing
one-bit GPE enable masks and using it where appropriate.

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

---
drivers/acpi/acpica/achware.h | 3 ++
drivers/acpi/acpica/evgpe.c | 7 ++---
drivers/acpi/acpica/hwgpe.c | 52 ++++++++++++++++++++++++++++++++----------
3 files changed, 46 insertions(+), 16 deletions(-)

--- a/drivers/acpi/acpica/achware.h
+++ b/drivers/acpi/acpica/achware.h
@@ -90,6 +90,9 @@ acpi_status acpi_hw_write_port(acpi_io_a
/*
* hwgpe - GPE support
*/
+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
--- a/drivers/acpi/acpica/evgpe.c
+++ b/drivers/acpi/acpica/evgpe.c
@@ -68,7 +68,7 @@ acpi_status
acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info)
{
struct acpi_gpe_register_info *gpe_register_info;
- u8 register_bit;
+ u32 register_bit;

ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);

@@ -77,9 +77,8 @@ acpi_ev_update_gpe_enable_masks(struct a
return_ACPI_STATUS(AE_NOT_EXIST);
}

- register_bit = (u8)
- (1 <<
- (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number));
+ register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+ gpe_register_info);

ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake, register_bit);
ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
--- a/drivers/acpi/acpica/hwgpe.c
+++ b/drivers/acpi/acpica/hwgpe.c
@@ -57,6 +57,27 @@ acpi_hw_enable_wakeup_gpe_block(struct a

/******************************************************************************
*
+ * FUNCTION: acpi_hw_gpe_register_bit
+ *
+ * PARAMETERS: gpe_event_info - Info block for the GPE
+ * gpe_register_info - Info block for the GPE register
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Compute GPE enable mask with one bit corresponding to the given
+ * GPE set.
+ *
+ ******************************************************************************/
+
+u32 acpi_hw_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info,
+ struct acpi_gpe_register_info *gpe_register_info)
+{
+ return (u32)1 << (gpe_event_info->gpe_number -
+ gpe_register_info->base_gpe_number);
+}
+
+/******************************************************************************
+ *
* FUNCTION: acpi_hw_low_disable_gpe
*
* PARAMETERS: gpe_event_info - Info block for the GPE to be disabled
@@ -72,6 +93,7 @@ acpi_status acpi_hw_low_disable_gpe(stru
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
u32 enable_mask;
+ u32 register_bit;

/* Get the info block for the entire GPE register */

@@ -89,9 +111,9 @@ acpi_status acpi_hw_low_disable_gpe(stru

/* 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)));
+ register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+ gpe_register_info);
+ ACPI_CLEAR_BIT(enable_mask, register_bit);

/* Write the updated enable mask */

@@ -150,21 +172,28 @@ acpi_hw_write_gpe_enable_reg(struct acpi

acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
{
+ struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
- u8 register_bit;
+ u32 register_bit;

ACPI_FUNCTION_ENTRY();

- register_bit = (u8)(1 <<
- (gpe_event_info->gpe_number -
- gpe_event_info->register_info->base_gpe_number));
+ /* 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);
+ }
+
+ register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+ gpe_register_info);

/*
* Write a one to the appropriate bit in the status register to
* clear this GPE.
*/
status = acpi_hw_write(register_bit,
- &gpe_event_info->register_info->status_address);
+ &gpe_register_info->status_address);

return (status);
}
@@ -187,7 +216,7 @@ acpi_hw_get_gpe_status(struct acpi_gpe_e
acpi_event_status * event_status)
{
u32 in_byte;
- u8 register_bit;
+ u32 register_bit;
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
acpi_event_status local_event_status = 0;
@@ -204,9 +233,8 @@ acpi_hw_get_gpe_status(struct acpi_gpe_e

/* Get the register bitmask for this GPE */

- register_bit = (u8)(1 <<
- (gpe_event_info->gpe_number -
- gpe_event_info->register_info->base_gpe_number));
+ register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+ gpe_register_info);

/* GPE currently enabled? (enabled for runtime?) */



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