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Power management fixes for 3.6-rc6

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* Three ACPI device power management fixes related to checking and
   setting device power states.
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Merge tag 'pm-for-3.6-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael J. Wysocki:
 "Three ACPI device power management fixes related to checking and
  setting device power states."

* tag 'pm-for-3.6-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / PM: Use KERN_DEBUG when no power resources are found
  ACPI / PM: Fix resource_lock dead lock in acpi_power_on_device
  ACPI / PM: Infer parent power state from child if unknown, v2
This commit is contained in:
Linus Torvalds 2012-09-16 12:59:42 -07:00
commit 9bc67590a6
2 changed files with 34 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/acpi/bus.c
View File

@ -237,6 +237,16 @@ static int __acpi_bus_get_power(struct acpi_device *device, int *state)
} else if (result == ACPI_STATE_D3_HOT) {
result = ACPI_STATE_D3;
}
/*
* If we were unsure about the device parent's power state up to this
* point, the fact that the device is in D0 implies that the parent has
* to be in D0 too.
*/
if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
&& result == ACPI_STATE_D0)
device->parent->power.state = ACPI_STATE_D0;
*state = result;
out:

36
drivers/acpi/power.c
View File

@ -107,6 +107,7 @@ struct acpi_power_resource {
/* List of devices relying on this power resource */
struct acpi_power_resource_device *devices;
struct mutex devices_lock;
};
static struct list_head acpi_power_resource_list;
@ -225,7 +226,6 @@ static void acpi_power_on_device(struct acpi_power_managed_device *device)
static int __acpi_power_on(struct acpi_power_resource *resource)
{
struct acpi_power_resource_device *device_list = resource->devices;
acpi_status status = AE_OK;
status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
@ -238,19 +238,15 @@ static int __acpi_power_on(struct acpi_power_resource *resource)
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
resource->name));
while (device_list) {
acpi_power_on_device(device_list->device);
device_list = device_list->next;
}
return 0;
}
static int acpi_power_on(acpi_handle handle)
{
int result = 0;
bool resume_device = false;
struct acpi_power_resource *resource = NULL;
struct acpi_power_resource_device *device_list;
result = acpi_power_get_context(handle, &resource);
if (result)
@ -266,10 +262,25 @@ static int acpi_power_on(acpi_handle handle)
result = __acpi_power_on(resource);
if (result)
resource->ref_count--;
else
resume_device = true;
}
mutex_unlock(&resource->resource_lock);
if (!resume_device)
return result;
mutex_lock(&resource->devices_lock);
device_list = resource->devices;
while (device_list) {
acpi_power_on_device(device_list->device);
device_list = device_list->next;
}
mutex_unlock(&resource->devices_lock);
return result;
}
@ -355,7 +366,7 @@ static void __acpi_power_resource_unregister_device(struct device *dev,
if (acpi_power_get_context(res_handle, &resource))
return;
mutex_lock(&resource->resource_lock);
mutex_lock(&resource->devices_lock);
prev = NULL;
curr = resource->devices;
while (curr) {
@ -372,7 +383,7 @@ static void __acpi_power_resource_unregister_device(struct device *dev,
prev = curr;
curr = curr->next;
}
mutex_unlock(&resource->resource_lock);
mutex_unlock(&resource->devices_lock);
}
/* Unlink dev from all power resources in _PR0 */
@ -414,10 +425,10 @@ static int __acpi_power_resource_register_device(
power_resource_device->device = powered_device;
mutex_lock(&resource->resource_lock);
mutex_lock(&resource->devices_lock);
power_resource_device->next = resource->devices;
resource->devices = power_resource_device;
mutex_unlock(&resource->resource_lock);
mutex_unlock(&resource->devices_lock);
return 0;
}
@ -462,7 +473,7 @@ int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
return ret;
no_power_resource:
printk(KERN_WARNING PREFIX "Invalid Power Resource to register!");
printk(KERN_DEBUG PREFIX "Invalid Power Resource to register!");
return -ENODEV;
}
EXPORT_SYMBOL_GPL(acpi_power_resource_register_device);
@ -721,6 +732,7 @@ static int acpi_power_add(struct acpi_device *device)
resource->device = device;
mutex_init(&resource->resource_lock);
mutex_init(&resource->devices_lock);
strcpy(resource->name, device->pnp.bus_id);
strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_POWER_CLASS);