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Date: Tue, 5 Aug 2008 05:49:36 +0530
From: "Dasgupta, Romit" <romit@...com>
To: Alan Stern <stern@...land.harvard.edu>,
"Rafael J. Wysocki" <rjw@...k.pl>
CC: David Engraf <david.engraf@...com.eu>, Greg KH <greg@...ah.com>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: RE: [PATCH] [PM] Fixes missing PM entries in sysfs without
CONFIG_PM_SLEEP
A minor change below: Removed old goto label PMError and introduced SysFSError.
Tested with CONFIG_PM, CONFIG_PM_SLEEP, without CONFIG_PM and ofcourse with CONFIG_USB_SUSPEND. Works fine.
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 068aa1c..9c77939 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -541,6 +541,7 @@ void device_initialize(struct device *dev)
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);
}
@@ -897,9 +898,10 @@ 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 SysFSError;
+ device_pm_add(dev);
kobject_uevent(&dev->kobj, KOBJ_ADD);
bus_attach_device(dev);
if (parent)
@@ -920,7 +922,7 @@ int device_add(struct device *dev)
Done:
put_device(dev);
return error;
- PMError:
+ SysFSError:
bus_remove_device(dev);
BusError:
if (dev->bus)
@@ -1007,6 +1009,7 @@ 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)) {
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 3250c52..d1f752b 100644
--- a/drivers/base/power/main.c
+++ b/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 +87,8 @@ 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 +103,6 @@ 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);
}
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index a3252c0..41f51fa 100644
--- a/drivers/base/power/power.h
+++ b/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(struct list_head *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 *);
#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
>-----Original Message-----
>From: Alan Stern [mailto:stern@...land.harvard.edu]
>Sent: Monday, August 04, 2008 9:15 PM
>To: Rafael J. Wysocki
>Cc: Dasgupta, Romit; David Engraf; Greg KH; linux-usb@...r.kernel.org; linux-
>kernel@...r.kernel.org; Linux-pm mailing list
>Subject: Re: [PATCH] [PM] Fixes missing PM entries in sysfs without
>CONFIG_PM_SLEEP
>
>On Mon, 4 Aug 2008, Rafael J. Wysocki wrote:
>
>> > Do you think we will want to make device_pm_add() return an error at
>> > some point in the future?
>>
>> Well, maybe, but not any time soon. :-)
>
>Okay, here's the updated patch. Awaiting comments from the testers...
>
>Alan Stern
>
>
>
>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;
>+ device_pm_add(dev);
> kobject_uevent(&dev->kobj, KOBJ_ADD);
> bus_attach_device(dev);
> if (parent)
>@@ -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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