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SubjectRe: [PATCH] create /sys/.../power when CONFIG_PM is set
On Wed,  7 Nov 2007 10:10:43 +0000 (GMT)
Daniel Drake <dsd@gentoo.org> wrote:
> 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.
>

Your patch is for 2.6.24-rc2 and 2.6.23, afacit. It needed some work to
apply on Greg's tree because the new pm_sleep_lock() and pm_sleep_unlock()
went and copied the same bug as you've fixed here.

I guess the right thing to do is to apply your patch as-is to 2.6.24-rcX
and to 2.6.23.x. I can't really do that because doing so would wreck my
copy of Greg's tree.


So I'll run with the below (I think it's right) and will let Greg sort it
out ;)



From: Daniel Drake <dsd@gentoo.org>

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: Greg KH <greg@kroah.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/base/core.c | 4 ++-
drivers/base/power/Makefile | 3 +-
drivers/base/power/main.c | 8 ------
drivers/base/power/power.h | 40 ++++++++++++++++++++++------------
4 files changed, 33 insertions(+), 22 deletions(-)
diff -puN drivers/base/core.c~create-sys-power-when-config_pm-is-set drivers/base/core.c
--- a/drivers/base/core.c~create-sys-power-when-config_pm-is-set
+++ a/drivers/base/core.c
@@ -785,9 +785,10 @@ 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;
@@ -813,6 +814,7 @@ 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->p->bus_notifier,
diff -puN drivers/base/power/Makefile~create-sys-power-when-config_pm-is-set drivers/base/power/Makefile
--- a/drivers/base/power/Makefile~create-sys-power-when-config_pm-is-set
+++ a/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 -puN drivers/base/power/main.c~create-sys-power-when-config_pm-is-set drivers/base/power/main.c
--- a/drivers/base/power/main.c~create-sys-power-when-config_pm-is-set
+++ a/drivers/base/power/main.c
@@ -59,20 +59,14 @@ static DECLARE_RWSEM(pm_sleep_rwsem);
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 -puN drivers/base/power/power.h~create-sys-power-when-config_pm-is-set drivers/base/power/power.h
--- a/drivers/base/power/power.h~create-sys-power-when-config_pm-is-set
+++ a/drivers/base/power/power.h
@@ -13,31 +13,23 @@ 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 *);
extern int pm_sleep_lock(void);
extern void pm_sleep_unlock(void);

-/*
- * sysfs.c
- */
-
-extern int dpm_sysfs_add(struct device *);
-extern void dpm_sysfs_remove(struct device *);
-
#else /* CONFIG_PM_SLEEP */

-
-static inline int device_pm_add(struct device * dev)
+static inline void device_pm_add(struct device *dev)
{
- return 0;
}
-static inline void device_pm_remove(struct device * dev)
+
+static inline void device_pm_remove(struct device *dev)
{
}

@@ -51,3 +43,25 @@ static inline void pm_sleep_unlock(void)
}

#endif
+
+#ifdef CONFIG_PM
+
+/*
+ * sysfs.c
+ */
+
+extern int dpm_sysfs_add(struct device *);
+extern void dpm_sysfs_remove(struct device *);
+
+#else /* CONFIG_PM */
+
+static inline int dpm_sysfs_add(struct device *dev)
+{
+ return 0;
+}
+
+static inline void dpm_sysfs_remove(struct device *dev)
+{
+}
+
+#endif
_
-
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