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@gentoo.org>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 3f4d6aa..2683eac 100644 (file)
--- a/drivers/base/core.c
+++ b/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,

diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile
index a803733..44504e6 100644 (file)
--- a/drivers/base/power/Makefile
+++ b/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)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 0ab4ab2..691ffb6 100644 (file)
--- a/drivers/base/power/main.c
+++ b/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)

diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 5c4efd4..379da4e 100644 (file)
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -13,14 +13,29 @@ extern void device_shutdown(void);
 
 extern struct list_head dpm_active;    /* The active device list */
 
-static inline struct device * to_device(struct list_head * entry)
+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 void device_pm_add(struct device *dev)
+{
+}
+
+static inline void device_pm_remove(struct device *dev)
+{
+}
+
+#endif
+
+#ifdef CONFIG_PM
+
 /*
  * sysfs.c
  */
@@ -28,16 +43,15 @@ extern void device_pm_remove(struct device *);
 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