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platform_kernel-5.15
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PM: don't skip device PM init when CONFIG_PM_SLEEP isn't set and CONFIG_PM is set 

This patch (as1124) fixes a couple of bugs in the PM core.  The new
dev->power.status field should be initialized regardless of whether
CONFIG_PM_SLEEP is enabled, and similarly dpm_sysfs_add() should be
called whenever CONFIG_PM is enabled.

The patch separates out the call to dpm_sysfs_add() from the call to
device_pm_add().  As a result device_pm_add() can no longer return an
error, so its return type is changed to void.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Romit Dasgupta <romit@ti.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2008-08-07 13:06:12 -04:00 committed by Greg Kroah-Hartman
parent 7c2250352e
commit 3b98aeaf3a
3 changed files with 16 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/base/core.c
View File

@ -541,6 +541,7 @@ void device_initialize(struct device *dev)
spin_lock_init(&dev->devres_lock); spin_lock_init(&dev->devres_lock);
INIT_LIST_HEAD(&dev->devres_head); INIT_LIST_HEAD(&dev->devres_head);
device_init_wakeup(dev, 0); device_init_wakeup(dev, 0);
device_pm_init(dev);
set_dev_node(dev, -1); set_dev_node(dev, -1);
} }
@ -897,9 +898,10 @@ int device_add(struct device *dev)
error = bus_add_device(dev); error = bus_add_device(dev);
if (error) if (error)
goto BusError; goto BusError;
error = device_pm_add(dev); error = dpm_sysfs_add(dev);
if (error) if (error)
goto PMError; goto DPMError;
device_pm_add(dev);
kobject_uevent(&dev->kobj, KOBJ_ADD); kobject_uevent(&dev->kobj, KOBJ_ADD);
bus_attach_device(dev); bus_attach_device(dev);
if (parent) if (parent)
@ -920,7 +922,7 @@ int device_add(struct device *dev)
Done: Done:
put_device(dev); put_device(dev);
return error; return error;
PMError: DPMError:
bus_remove_device(dev); bus_remove_device(dev);
BusError: BusError:
if (dev->bus) if (dev->bus)
@ -1007,6 +1009,7 @@ void device_del(struct device *dev)
struct class_interface *class_intf; struct class_interface *class_intf;
device_pm_remove(dev); device_pm_remove(dev);
dpm_sysfs_remove(dev);
if (parent) if (parent)
klist_del(&dev->knode_parent); klist_del(&dev->knode_parent);
if (MAJOR(dev->devt)) { if (MAJOR(dev->devt)) {

13
drivers/base/power/main.c
View File

@ -67,10 +67,8 @@ void device_pm_unlock(void)
* device_pm_add - add a device to the list of active devices * device_pm_add - add a device to the list of active devices
* @dev: Device to be added to the list * @dev: Device to be added to the list
*/ */
int device_pm_add(struct device *dev) void device_pm_add(struct device *dev)
{ {
int error;
pr_debug("PM: Adding info for %s:%s\n", pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus", dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj)); kobject_name(&dev->kobj));
@ -89,13 +87,9 @@ int device_pm_add(struct device *dev)
*/ */
WARN_ON(true); WARN_ON(true);
} }
error = dpm_sysfs_add(dev);
if (!error) { list_add_tail(&dev->power.entry, &dpm_list);
dev->power.status = DPM_ON;
list_add_tail(&dev->power.entry, &dpm_list);
}
mutex_unlock(&dpm_list_mtx); mutex_unlock(&dpm_list_mtx);
return error;
} }
/** /**
@ -110,7 +104,6 @@ void device_pm_remove(struct device *dev)
dev->bus ? dev->bus->name : "No Bus", dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj)); kobject_name(&dev->kobj));
mutex_lock(&dpm_list_mtx); mutex_lock(&dpm_list_mtx);
dpm_sysfs_remove(dev);
list_del_init(&dev->power.entry); list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx); mutex_unlock(&dpm_list_mtx);
} }

9
drivers/base/power/power.h
View File

@ -1,3 +1,8 @@
static inline void device_pm_init(struct device *dev)
{
dev->power.status = DPM_ON;
}
#ifdef CONFIG_PM_SLEEP #ifdef CONFIG_PM_SLEEP
/* /*
@ -11,12 +16,12 @@ static inline struct device *to_device(struct list_head *entry)
return container_of(entry, struct device, power.entry); return container_of(entry, struct device, power.entry);
} }
extern int device_pm_add(struct device *); extern void device_pm_add(struct device *);
extern void device_pm_remove(struct device *); extern void device_pm_remove(struct device *);
#else /* CONFIG_PM_SLEEP */ #else /* CONFIG_PM_SLEEP */
static inline int device_pm_add(struct device *dev) { return 0; } static inline void device_pm_add(struct device *dev) {}
static inline void device_pm_remove(struct device *dev) {} static inline void device_pm_remove(struct device *dev) {}
#endif #endif