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-rw-r--r--drivers/acpi/power.c24
-rw-r--r--include/acpi/acpi_bus.h1
2 files changed, 23 insertions, 2 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 2e959aa..4ab21cb 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -363,11 +363,18 @@ int acpi_device_sleep_wake(struct acpi_device *dev,
*/
int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
{
- int i;
+ int i, err;
if (!dev || !dev->wakeup.flags.valid)
return -EINVAL;
+ /*
+ * Do not execute the code below twice in a row without calling
+ * acpi_disable_wakeup_device_power() in between for the same device
+ */
+ if (dev->wakeup.flags.prepared)
+ return 0;
+
/* Open power resource */
for (i = 0; i < dev->wakeup.resources.count; i++) {
int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
@@ -382,7 +389,11 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
* Passing 3 as the third argument below means the device may be placed
* in arbitrary power state afterwards.
*/
- return acpi_device_sleep_wake(dev, 1, sleep_state, 3);
+ err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
+ if (!err)
+ dev->wakeup.flags.prepared = 1;
+
+ return err;
}
/*
@@ -398,6 +409,15 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
if (!dev || !dev->wakeup.flags.valid)
return -EINVAL;
+ /*
+ * Do not execute the code below twice in a row without calling
+ * acpi_enable_wakeup_device_power() in between for the same device
+ */
+ if (!dev->wakeup.flags.prepared)
+ return 0;
+
+ dev->wakeup.flags.prepared = 0;
+
ret = acpi_device_sleep_wake(dev, 0, 0, 0);
if (ret)
return ret;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 0c21ea3..071daf8 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -259,6 +259,7 @@ struct acpi_device_perf {
/* Wakeup Management */
struct acpi_device_wakeup_flags {
u8 valid:1; /* Can successfully enable wakeup? */
+ u8 prepared:1; /* Has the wake-up capability been enabled? */
u8 run_wake:1; /* Run-Wake GPE devices */
};
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