PM: Do not use the syscore flag for runtime PM

The syscore device PM flag used to mark the devices (belonging to PM domains) that should never be turned off, except for the system core (syscore) suspend/hibernation and resume stages, need not be accessed by the runtime PM core functions, because all of the devices it is set for need to be marked as "irq safe" anyway and are protected from being turned off by runtime PM by ensuring that their usage counters are always set. For this reason, make the syscore flag system-wide PM-specific and simplify the code used for manipulating it, because it need not acquire the device's power.lock any more. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
mariux64 · Sep 3, 2012 · feb70af · feb70af
1 parent 3cb6f10
commit feb70af
Show file tree

Hide file tree

Showing 5 changed files with 10 additions and 22 deletions.
diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
@@ -83,18 +83,3 @@ int dev_pm_put_subsys_data(struct device *dev)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data);
-
-/**
- * dev_pm_syscore_device - Set/unset the given device's power.syscore flag.
- * @dev: Device whose flag is to be modified.
- * @val: New value of the flag.
- */
-void dev_pm_syscore_device(struct device *dev, bool val)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&dev->power.lock, flags);
-	dev->power.syscore = val;
-	spin_unlock_irqrestore(&dev->power.lock, flags);
-}
-EXPORT_SYMBOL_GPL(dev_pm_syscore_device);
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
@@ -442,7 +442,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
 	not_suspended = 0;
 	list_for_each_entry(pdd, &genpd->dev_list, list_node)
 		if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
-		    || pdd->dev->power.irq_safe || pdd->dev->power.syscore))
+		    || pdd->dev->power.irq_safe))
 			not_suspended++;
 
 	if (not_suspended > genpd->in_progress)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
@@ -134,7 +134,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
 
 	if (dev->power.runtime_error)
 		retval = -EINVAL;
-	else if (dev->power.disable_depth > 0 || dev->power.syscore)
+	else if (dev->power.disable_depth > 0)
 		retval = -EACCES;
 	else if (atomic_read(&dev->power.usage_count) > 0)
 		retval = -EAGAIN;

diff --git a/include/linux/device.h b/include/linux/device.h
@@ -772,6 +772,13 @@ static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
 	dev->power.ignore_children = enable;
 }
 
+static inline void dev_pm_syscore_device(struct device *dev, bool val)
+{
+#ifdef CONFIG_PM_SLEEP
+	dev->power.syscore = val;
+#endif
+}
+
 static inline void device_lock(struct device *dev)
 {
 	mutex_lock(&dev->mutex);

diff --git a/include/linux/pm.h b/include/linux/pm.h
@@ -43,12 +43,8 @@ struct device;
 
 #ifdef CONFIG_PM
 extern const char power_group_name[];		/* = "power" */
-
-extern void dev_pm_syscore_device(struct device *dev, bool val);
 #else
 #define power_group_name	NULL
-
-static inline void dev_pm_syscore_device(struct device *dev, bool val) {}
 #endif
 
 typedef struct pm_message {
@@ -515,13 +511,13 @@ struct dev_pm_info {
 	bool			is_suspended:1;	/* Ditto */
 	bool			ignore_children:1;
 	bool			early_init:1;	/* Owned by the PM core */
-	bool			syscore:1;
 	spinlock_t		lock;
 #ifdef CONFIG_PM_SLEEP
 	struct list_head	entry;
 	struct completion	completion;
 	struct wakeup_source	*wakeup;
 	bool			wakeup_path:1;
+	bool			syscore:1;
 #else
 	unsigned int		should_wakeup:1;
 #endif