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PM: Reference counting of power.subsys_data

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Since the power.subsys_data device field will be used by multiple
filesystems, introduce a reference counting mechanism for it to avoid
freeing it prematurely or changing its value at a wrong time.

Make the PM clocks management code that currently is the only user of
power.subsys_data use the new reference counting.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki
2011-08-25 15:34:01 +02:00
parent 5c095a0e0d
commit ef27bed187
4 changed files with 96 additions and 20 deletions
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3
include/linux/pm.h
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@@ -423,6 +423,7 @@ struct wakeup_source;
struct pm_subsys_data {
spinlock_t lock;
unsigned int refcount;
#ifdef CONFIG_PM_CLK
struct list_head clock_list;
#endif
@@ -473,6 +474,8 @@ struct dev_pm_info {
};
extern void update_pm_runtime_accounting(struct device *dev);
extern int dev_pm_get_subsys_data(struct device *dev);
extern int dev_pm_put_subsys_data(struct device *dev);
/*
* Power domains provide callbacks that are executed during system suspend,