ACPI / PM: Do not disable wakeup GPEs that have not been enabled

In some cases acpi_device_wakeup() may be called to ensure wakeup
power to be off for a given device even though that device's wakeup
GPE has not been enabled so far.  It calls acpi_disable_gpe() on a
GPE that's not enabled and this causes ACPICA to return the AE_LIMIT
status code from that call which then is reported as an error by the
ACPICA's debug facilities (if enabled).  This may lead to a fair
amount of confusion, so introduce a new ACPI device wakeup flag
to store the wakeup GPE status and avoid disabling wakeup GPEs
that have not been enabled.

Reported-and-tested-by: Venkat Raghavulu <venkat.raghavulu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 11 insertions, 2 deletions

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 076af8149566..e6ff33ecd784 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -680,13 +680,21 @@ static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state,
                 if (error)
                         return error;
 
+                if (adev->wakeup.flags.enabled)
+                        return 0;
+
                 res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
-                if (ACPI_FAILURE(res)) {
+                if (ACPI_SUCCESS(res)) {
+                        adev->wakeup.flags.enabled = 1;
+                } else {
                         acpi_disable_wakeup_device_power(adev);
                         return -EIO;
                 }
         } else {
-                acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
+                if (adev->wakeup.flags.enabled) {
+                        acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
+                        adev->wakeup.flags.enabled = 0;
+                }
                 acpi_disable_wakeup_device_power(adev);
         }
         return 0;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index f34a0835aa4f..8de31d472fad 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -312,6 +312,7 @@ struct acpi_device_wakeup_flags {
         u8 valid:1;             /* Can successfully enable wakeup? */
         u8 run_wake:1;          /* Run-Wake GPE devices */
         u8 notifier_present:1;  /* Wake-up notify handler has been installed */
+        u8 enabled:1;           /* Enabled for wakeup */
 };
 
 struct acpi_device_wakeup_context {