linux-kernel - Re: [PATCH] [PM] Fixes missing PM entries in sysfs without CONFIG_PM

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Date:	Mon, 4 Aug 2008 10:45:15 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Dasgupta, Romit" <romit@...com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	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

On Sun, 3 Aug 2008, Dasgupta, Romit wrote:

> Alan,
>          Here is a patch for you. Tested with
> 
> 1) CONFIG_SUSPEND, CONFIG_HIBERNATION i.e. with CONFIG_PM_SLEEP
> 2) without CONFIG_PM_SLEEP but with CONFIG_PM
> 3) without CONFIG_PM

I'd prefer to use the patch below.  Although it's a little longer, the 
end result is slightly less complicated.  Also, it fixes two problems:

	dpm_sysfs_add/remove should be called whenever CONFIG_PM
	is defined, regardless of CONFIG_PM_SLEEP.

	dev->power.status should be initialized to DPM_ON even if
	CONFIG_PM isn't defined.

Can you make sure it compiles properly under all three configurations?

Rafael, any objections?

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
 
 /*
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);
 }
 
@@ -898,6 +899,9 @@ int device_add(struct device *dev)
 	error = bus_add_device(dev);
 	if (error)
 		goto BusError;
+	error = dpm_sysfs_add(dev);
+	if (error)
+		goto DPMError;
 	error = device_pm_add(dev);
 	if (error)
 		goto PMError;
@@ -922,6 +926,8 @@ int device_add(struct device *dev)
 	put_device(dev);
 	return error;
  PMError:
+	dpm_sysfs_remove(dev);
+ DPMError:
 	bus_remove_device(dev);
  BusError:
 	if (dev->bus)
@@ -1008,6 +1014,7 @@ 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
@@ -69,7 +69,7 @@ void device_pm_unlock(void)
  */
 int device_pm_add(struct device *dev)
 {
-	int error;
+	int error = 0;
 
 	pr_debug("PM: Adding info for %s:%s\n",
 		 dev->bus ? dev->bus->name : "No Bus",
@@ -89,11 +89,8 @@ 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 +107,6 @@ 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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