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Subject[PATCH 3/8] ACPI: EC: Return bool from acpi_ec_dispatch_gpe()
From: Rafael J. Wysocki <>

On some systems, if suspend-to-idle is used, the EC may singal system
wakeup events (power button events, for example) as well as events
that should not cause the system to resume and acpi_ec_dispatch_gpe()
needs to be called to determine whether or not the system should
resume then. In particular, if acpi_ec_dispatch_gpe() doesn't detect
any EC events at all, the system should remain suspended, so it is
useful to know when that is the case.

For this reason, make acpi_ec_dispatch_gpe() return a bool value
indicating whether or not any EC events have been detected by it.

Signed-off-by: Rafael J. Wysocki <>
drivers/acpi/ec.c | 11 ++++++++---
drivers/acpi/internal.h | 2 +-
2 files changed, 9 insertions(+), 4 deletions(-)

Index: linux-pm/drivers/acpi/ec.c
--- linux-pm.orig/drivers/acpi/ec.c
+++ linux-pm/drivers/acpi/ec.c
@@ -1060,10 +1060,15 @@ void acpi_ec_set_gpe_wake_mask(u8 action
acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);

-void acpi_ec_dispatch_gpe(void)
+bool acpi_ec_dispatch_gpe(void)
- if (first_ec)
- acpi_dispatch_gpe(NULL, first_ec->gpe);
+ u32 ret;
+ if (!first_ec)
+ return false;
+ ret = acpi_dispatch_gpe(NULL, first_ec->gpe);

/* --------------------------------------------------------------------------
Index: linux-pm/drivers/acpi/internal.h
--- linux-pm.orig/drivers/acpi/internal.h
+++ linux-pm/drivers/acpi/internal.h
@@ -196,7 +196,7 @@ void acpi_ec_block_transactions(void);
void acpi_ec_unblock_transactions(void);
void acpi_ec_mark_gpe_for_wake(void);
void acpi_ec_set_gpe_wake_mask(u8 action);
-void acpi_ec_dispatch_gpe(void);
+bool acpi_ec_dispatch_gpe(void);
int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
acpi_handle handle, acpi_ec_query_func func,
void *data);

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