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PM: Remove pm_parent from struct dev_pm_info 

The pm_parent member of struct dev_pm_info (defined in include/linux/pm.h) is
only used to check if the device's parent is in the right state while the
device is being suspended or resumed.  However, this can be done just as well
with the help of the parent pointer in struct device, so pm_parent can be
removed along with some code that handles it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rafael J. Wysocki 2007-06-13 15:53:34 +02:00 committed by Greg Kroah-Hartman
parent 11048dcf33
commit 9cddad7757
4 changed files with 10 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/base/power/main.c
View File

@ -33,28 +33,7 @@ DEFINE_MUTEX(dpm_list_mtx);
int (*platform_enable_wakeup)(struct device *dev, int is_on);
/**
* device_pm_set_parent - Specify power dependency.
* @dev: Device who needs power.
* @parent: Device that supplies power.
*
* This function is used to manually describe a power-dependency
* relationship. It may be used to specify a transversal relationship
* (where the power supplier is not the physical (or electrical)
* ancestor of a specific device.
* The effect of this is that the supplier will not be powered down
* before the power dependent.
*/
void device_pm_set_parent(struct device * dev, struct device * parent)
{
put_device(dev->power.pm_parent);
dev->power.pm_parent = get_device(parent);
}
EXPORT_SYMBOL_GPL(device_pm_set_parent);
int device_pm_add(struct device * dev)
int device_pm_add(struct device *dev)
{
int error;
@ -63,21 +42,20 @@ int device_pm_add(struct device * dev)
kobject_name(&dev->kobj));
mutex_lock(&dpm_list_mtx);
list_add_tail(&dev->power.entry, &dpm_active);
device_pm_set_parent(dev, dev->parent);
if ((error = dpm_sysfs_add(dev)))
error = dpm_sysfs_add(dev);
if (error)
list_del(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
return error;
}
void device_pm_remove(struct device * dev)
void device_pm_remove(struct device *dev)
{
pr_debug("PM: Removing info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
mutex_lock(&dpm_list_mtx);
dpm_sysfs_remove(dev);
put_device(dev->power.pm_parent);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
}

7
drivers/base/power/resume.c
View File

@ -29,12 +29,11 @@ int resume_device(struct device * dev)
down(&dev->sem);
if (dev->power.pm_parent
&& dev->power.pm_parent->power.power_state.event) {
if (dev->parent && dev->parent->power.power_state.event) {
dev_err(dev, "PM: resume from %d, parent %s still %d\n",
dev->power.power_state.event,
dev->power.pm_parent->bus_id,
dev->power.pm_parent->power.power_state.event);
dev->parent->bus_id,
dev->parent->power.power_state.event);
}
if (dev->bus && dev->bus->resume) {

7
drivers/base/power/suspend.c
View File

@ -55,13 +55,12 @@ int suspend_device(struct device * dev, pm_message_t state)
dev_dbg(dev, "PM: suspend %d-->%d\n",
dev->power.power_state.event, state.event);
}
if (dev->power.pm_parent
&& dev->power.pm_parent->power.power_state.event) {
if (dev->parent && dev->parent->power.power_state.event) {
dev_err(dev,
"PM: suspend %d->%d, parent %s already %d\n",
dev->power.power_state.event, state.event,
dev->power.pm_parent->bus_id,
dev->power.pm_parent->power.power_state.event);
dev->parent->bus_id,
dev->parent->power.power_state.event);
}
dev->power.prev_state = dev->power.power_state;

3
include/linux/pm.h
View File

@ -269,13 +269,10 @@ struct dev_pm_info {
unsigned should_wakeup:1;
pm_message_t prev_state;
void * saved_state;
struct device * pm_parent;
struct list_head entry;
#endif
};
extern void device_pm_set_parent(struct device * dev, struct device * parent);
extern int device_power_down(pm_message_t state);
extern void device_power_up(void);
extern void device_resume(void);