Commit c52fa70c authored Dec 01, 2014 by Rafael J. Wysocki

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>

parent 331dfcf8

drivers/acpi/sleep.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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)