diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/power.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index 2e959aa1ef0..4ab21cb1c8c 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; |