ACPI / sleep: Drain outstanding events after disabling multiple GPEs

After multiple GPEs have been disabled at the low level in one go,
like when acpi_disable_all_gpes() is called, we should always drain
all of the outstanding events from them, or interesting races become
possible.

For this reason, call acpi_os_wait_events_complete() after
acpi_enable_all_wakeup_gpes() and acpi_disable_all_gpes() in
acpi_freeze_prepare() and acpi_power_off_prepare(), respectively.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 05a31b573fc3..8aa9254a387f 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -630,6 +630,7 @@ static int acpi_freeze_begin(void)
 static int acpi_freeze_prepare(void)
 {
         acpi_enable_all_wakeup_gpes();
+        acpi_os_wait_events_complete();
         enable_irq_wake(acpi_gbl_FADT.sci_interrupt);
         return 0;
 }
@@ -825,6 +826,7 @@ static void acpi_power_off_prepare(void)
         /* Prepare to power off the system */
         acpi_sleep_prepare(ACPI_STATE_S5);
         acpi_disable_all_gpes();
+        acpi_os_wait_events_complete();
 }
 
 static void acpi_power_off(void)