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path: root/drivers/acpi/power.c
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Diffstat (limited to 'drivers/acpi/power.c')
-rw-r--r--drivers/acpi/power.c58
1 files changed, 35 insertions, 23 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index d74365d4a6e7..5a09bf392ec1 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -44,6 +44,8 @@
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
+#include "sleep.h"
+
#define _COMPONENT ACPI_POWER_COMPONENT
ACPI_MODULE_NAME("power");
#define ACPI_POWER_CLASS "power_resource"
@@ -361,17 +363,15 @@ int acpi_device_sleep_wake(struct acpi_device *dev,
*/
int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
{
- int i, err;
+ int i, err = 0;
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;
+ mutex_lock(&acpi_device_lock);
+
+ if (dev->wakeup.prepare_count++)
+ goto out;
/* Open power resource */
for (i = 0; i < dev->wakeup.resources.count; i++) {
@@ -379,7 +379,8 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
if (ret) {
printk(KERN_ERR PREFIX "Transition power state\n");
dev->wakeup.flags.valid = 0;
- return -ENODEV;
+ err = -ENODEV;
+ goto err_out;
}
}
@@ -388,9 +389,13 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
* in arbitrary power state afterwards.
*/
err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
- if (!err)
- dev->wakeup.flags.prepared = 1;
+ err_out:
+ if (err)
+ dev->wakeup.prepare_count = 0;
+
+ out:
+ mutex_unlock(&acpi_device_lock);
return err;
}
@@ -402,35 +407,42 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
*/
int acpi_disable_wakeup_device_power(struct acpi_device *dev)
{
- int i, ret;
+ int i, err = 0;
if (!dev || !dev->wakeup.flags.valid)
return -EINVAL;
+ mutex_lock(&acpi_device_lock);
+
+ if (--dev->wakeup.prepare_count > 0)
+ goto out;
+
/*
- * Do not execute the code below twice in a row without calling
- * acpi_enable_wakeup_device_power() in between for the same device
+ * Executing the code below even if prepare_count is already zero when
+ * the function is called may be useful, for example for initialisation.
*/
- if (!dev->wakeup.flags.prepared)
- return 0;
+ if (dev->wakeup.prepare_count < 0)
+ dev->wakeup.prepare_count = 0;
- dev->wakeup.flags.prepared = 0;
-
- ret = acpi_device_sleep_wake(dev, 0, 0, 0);
- if (ret)
- return ret;
+ err = acpi_device_sleep_wake(dev, 0, 0, 0);
+ if (err)
+ goto out;
/* Close power resource */
for (i = 0; i < dev->wakeup.resources.count; i++) {
- ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev);
+ int ret = acpi_power_off_device(
+ dev->wakeup.resources.handles[i], dev);
if (ret) {
printk(KERN_ERR PREFIX "Transition power state\n");
dev->wakeup.flags.valid = 0;
- return -ENODEV;
+ err = -ENODEV;
+ goto out;
}
}
- return ret;
+ out:
+ mutex_unlock(&acpi_device_lock);
+ return err;
}
/* --------------------------------------------------------------------------
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