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authorRafael J. Wysocki <rjw@sisk.pl>2008-07-07 03:34:11 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-07-07 16:26:14 -0700
commit0af4b8c4fb31193dc666f4893107a18fef82baab (patch)
tree1b7a3b95a24b603422b50312ace25d754786874a /drivers/acpi/power.c
parent77e766099efc29d8b01db4b8244ff64fa3d3d0ca (diff)
ACPI: Introduce new device wakeup flag 'prepared'
Introduce additional flag 'prepared' in struct acpi_device_wakeup_flags and use it to prevent devices from being enable/disabled do wake up the system multiple times in a row (this does not happen currently, but will be possible after some of the following patches). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/acpi/power.c')
-rw-r--r--drivers/acpi/power.c24
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;