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Subject[PATCH 07/15] PM: don't skip device PM init when CONFIG_PM_SLEEP isn't set and CONFIG_PM is set
Date
From: Alan Stern <stern@rowland.harvard.edu>

This patch (as1124) fixes a couple of bugs in the PM core. The new
dev->power.status field should be initialized regardless of whether
CONFIG_PM_SLEEP is enabled, and similarly dpm_sysfs_add() should be
called whenever CONFIG_PM is enabled.

The patch separates out the call to dpm_sysfs_add() from the call to
device_pm_add(). As a result device_pm_add() can no longer return an
error, so its return type is changed to void.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Romit Dasgupta <romit@ti.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/base/core.c | 9 ++++++---
drivers/base/power/main.c | 13 +++----------
drivers/base/power/power.h | 9 +++++++--
3 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 44bad73..4004131 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 DPMError;
+ 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:
+ DPMError:
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..284f564 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 +87,9 @@ 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);
}
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
--
1.5.6.5


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