ACPICA: Store GPE register enable masks upfront

It is reported that ACPI interrupts do not work any more on
Dell Latitude D600 after commit c50f13c672df (ACPICA: Save
current masks of enabled GPEs after enable register writes).
The problem turns out to be related to the fact that the
enable_mask and enable_for_run GPE bit masks are not in
sync (in the absence of any system suspend/resume events)
for at least one GPE register on that machine.

Address this problem by writing the enable_for_run mask into
enable_mask as soon as enable_for_run is updated instead of
doing that only after the subsequent register write has
succeeded.  For consistency, update acpi_hw_gpe_enable_write()
to store the bit mask to be written into the GPE register
in enable_mask unconditionally before the write.

Since the ACPI_GPE_SAVE_MASK flag is not necessary any more after
that, drop it along with the symbols depending on it.

Reported-and-tested-by: Jim Bos <jim876@xs4all.nl>
Fixes: c50f13c672df (ACPICA: Save current masks of enabled GPEs after enable register writes)
Cc: 3.19+ <stable@vger.kernel.org> # 3.19+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c
index d7be3cb..73cfa59 100644
--- a/drivers/acpi/acpica/hwgpe.c
+++ b/drivers/acpi/acpica/hwgpe.c
@@ -89,6 +89,8 @@
  * RETURN:	Status
  *
  * DESCRIPTION: Enable or disable a single GPE in the parent enable register.
+ *              The enable_mask field of the involved GPE register must be
+ *              updated by the caller if necessary.
  *
  ******************************************************************************/
 
@@ -119,7 +121,7 @@
 	/* Set or clear just the bit that corresponds to this GPE */
 
 	register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
-	switch (action & ~ACPI_GPE_SAVE_MASK) {
+	switch (action) {
 	case ACPI_GPE_CONDITIONAL_ENABLE:
 
 		/* Only enable if the corresponding enable_mask bit is set */
@@ -149,9 +151,6 @@
 	/* Write the updated enable mask */
 
 	status = acpi_hw_write(enable_mask, &gpe_register_info->enable_address);
-	if (ACPI_SUCCESS(status) && (action & ACPI_GPE_SAVE_MASK)) {
-		gpe_register_info->enable_mask = (u8)enable_mask;
-	}
 	return (status);
 }
 
@@ -297,10 +296,8 @@
 {
 	acpi_status status;
 
+	gpe_register_info->enable_mask = enable_mask;
 	status = acpi_hw_write(enable_mask, &gpe_register_info->enable_address);
-	if (ACPI_SUCCESS(status)) {
-		gpe_register_info->enable_mask = enable_mask;
-	}
 	return (status);
 }