On Tuesday, 5 of August 2008, Alan Stern wrote:
> 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@xxxxxxxxxxxxxxxxxxx>
> Tested-by: Romit Dasgupta <romit@xxxxxx>
Acked-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---
>
> This should be queued for 2.6.27.
>
>
> Index: usb-2.6/drivers/base/power/power.h
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/power.h
> +++ usb-2.6/drivers/base/power/power.h
> @@ -1,3 +1,8 @@
> +static inline void device_pm_init(struct device *dev)
> +{
> + dev->power.status = DPM_ON;
> +}
> +
> #ifdef CONFIG_PM_SLEEP
>
> /*
> @@ -11,12 +16,12 @@ static inline struct device *to_device(s
> 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 *);
>
> #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) {}
>
> #endif
> Index: usb-2.6/drivers/base/core.c
> ===================================================================
> --- usb-2.6.orig/drivers/base/core.c
> +++ usb-2.6/drivers/base/core.c
> @@ -542,6 +542,7 @@ void device_initialize(struct device *de
> spin_lock_init(&dev->devres_lock);
> INIT_LIST_HEAD(&dev->devres_head);
> device_init_wakeup(dev, 0);
> + device_pm_init(dev);
> set_dev_node(dev, -1);
> }
>
> @@ -898,9 +899,10 @@ int device_add(struct device *dev)
> error = bus_add_device(dev);
> if (error)
> goto BusError;
> - error = device_pm_add(dev);
> + error = dpm_sysfs_add(dev);
> if (error)
> - goto PMError;
> + goto DPMError;
> + device_pm_add(dev);
> kobject_uevent(&dev->kobj, KOBJ_ADD);
> bus_attach_device(dev);
> if (parent)
> @@ -921,7 +923,7 @@ int device_add(struct device *dev)
> Done:
> put_device(dev);
> return error;
> - PMError:
> + DPMError:
> bus_remove_device(dev);
> BusError:
> if (dev->bus)
> @@ -1008,6 +1010,7 @@ void device_del(struct device *dev)
> struct class_interface *class_intf;
>
> device_pm_remove(dev);
> + dpm_sysfs_remove(dev);
> if (parent)
> klist_del(&dev->knode_parent);
> if (MAJOR(dev->devt)) {
> Index: usb-2.6/drivers/base/power/main.c
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/main.c
> +++ usb-2.6/drivers/base/power/main.c
> @@ -67,10 +67,8 @@ void device_pm_unlock(void)
> * device_pm_add - add a device to the list of active devices
> * @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",
> dev->bus ? dev->bus->name : "No Bus",
> kobject_name(&dev->kobj));
> @@ -89,13 +87,9 @@ int device_pm_add(struct device *dev)
> */
> WARN_ON(true);
> }
> - error = dpm_sysfs_add(dev);
> - if (!error) {
> - dev->power.status = DPM_ON;
> - list_add_tail(&dev->power.entry, &dpm_list);
> - }
> +
> + list_add_tail(&dev->power.entry, &dpm_list);
> 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",
> kobject_name(&dev->kobj));
> mutex_lock(&dpm_list_mtx);
> - dpm_sysfs_remove(dev);
> list_del_init(&dev->power.entry);
> mutex_unlock(&dpm_list_mtx);
> }
>
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