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Message-Id: <20071107101043.2E64C9D4ECC@zog.reactivated.net>
Date: Wed, 7 Nov 2007 10:10:43 +0000 (GMT)
From: Daniel Drake <dsd@...too.org>
To: rjw@...k.pl
Cc: oneukum@...e.de
Subject: [PATCH] create /sys/.../power when CONFIG_PM is set
The CONFIG_SUSPEND changes in 2.6.23 caused a regression under certain
configuration conditions (SUSPEND=n, USB_AUTOSUSPEND=y) where all USB device
attributes in sysfs (idVendor, idProduct, ...) silently disappeared, causing
udev breakage and more.
The cause of this is that the /sys/.../power subdirectory is now only created
when CONFIG_PM_SLEEP is set, however, it should be created whenever CONFIG_PM
is set to handle the above situation. The following patch fixes the
regression.
Signed-off-by: Daniel Drake <dsd@...too.org>
Index: linux-2.6.24-rc1-git14/drivers/base/core.c
===================================================================
--- linux-2.6.24-rc1-git14.orig/drivers/base/core.c
+++ linux-2.6.24-rc1-git14/drivers/base/core.c
@@ -770,9 +770,10 @@ int device_add(struct device *dev)
error = device_add_attrs(dev);
if (error)
goto AttrsError;
- error = device_pm_add(dev);
+ error = dpm_sysfs_add(dev);
if (error)
goto PMError;
+ device_pm_add(dev);
error = bus_add_device(dev);
if (error)
goto BusError;
@@ -797,6 +798,7 @@ int device_add(struct device *dev)
return error;
BusError:
device_pm_remove(dev);
+ dpm_sysfs_remove(dev);
PMError:
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->bus_notifier,
Index: linux-2.6.24-rc1-git14/drivers/base/power/Makefile
===================================================================
--- linux-2.6.24-rc1-git14.orig/drivers/base/power/Makefile
+++ linux-2.6.24-rc1-git14/drivers/base/power/Makefile
@@ -1,5 +1,6 @@
obj-y := shutdown.o
-obj-$(CONFIG_PM_SLEEP) += main.o sysfs.o
+obj-$(CONFIG_PM) += sysfs.o
+obj-$(CONFIG_PM_SLEEP) += main.o
obj-$(CONFIG_PM_TRACE) += trace.o
ifeq ($(CONFIG_DEBUG_DRIVER),y)
Index: linux-2.6.24-rc1-git14/drivers/base/power/power.h
===================================================================
--- linux-2.6.24-rc1-git14.orig/drivers/base/power/power.h
+++ linux-2.6.24-rc1-git14/drivers/base/power/power.h
@@ -18,9 +18,24 @@ static inline struct device * to_device(
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 void device_pm_add(struct device * dev)
+{
+}
+static inline void device_pm_remove(struct device * dev)
+{
+
+}
+
+#endif
+
+#ifdef CONFIG_PM
+
/*
* sysfs.c
*/
@@ -28,16 +43,16 @@ extern void device_pm_remove(struct devi
extern int dpm_sysfs_add(struct device *);
extern void dpm_sysfs_remove(struct device *);
-#else /* CONFIG_PM_SLEEP */
+#else /* CONFIG_PM */
-
-static inline int device_pm_add(struct device * dev)
+static inline int dpm_sysfs_add(struct device * dev)
{
return 0;
}
-static inline void device_pm_remove(struct device * dev)
+static inline void dpm_sysfs_remove(struct device * dev)
{
}
-#endif
+#endif /* CONFIG_PM */
+
Index: linux-2.6.24-rc1-git14/drivers/base/power/main.c
===================================================================
--- linux-2.6.24-rc1-git14.orig/drivers/base/power/main.c
+++ linux-2.6.24-rc1-git14/drivers/base/power/main.c
@@ -38,20 +38,14 @@ static DEFINE_MUTEX(dpm_list_mtx);
int (*platform_enable_wakeup)(struct device *dev, int is_on);
-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));
mutex_lock(&dpm_list_mtx);
list_add_tail(&dev->power.entry, &dpm_active);
- 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)
-
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