ACPICA: GPE detect optimization - ignore unused GPE registers
This optimization will simply ignore GPE registers that contain
no enabled GPEs - there is no need to read the register.
ACPICA bugzilla 884.
http://www.acpica.org/bugzilla/show_bug.cgi?id=884
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
index 14988a8..67d44ef 100644
--- a/drivers/acpi/acpica/evgpe.c
+++ b/drivers/acpi/acpica/evgpe.c
@@ -373,6 +373,15 @@
gpe_register_info = &gpe_block->register_info[i];
+ /*
+ * Optimization: If there are no GPEs enabled within this
+ * register, we can safely ignore the entire register.
+ */
+ if (!(gpe_register_info->enable_for_run |
+ gpe_register_info->enable_for_wake)) {
+ continue;
+ }
+
/* Read the Status Register */
status =
