PM / cpuidle: Add driver reference counter
Add a reference counter for the cpuidle driver, so that it can't be unregistered when it is in use. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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@ -16,6 +16,7 @@
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static struct cpuidle_driver *cpuidle_curr_driver;
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DEFINE_SPINLOCK(cpuidle_driver_lock);
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int cpuidle_driver_refcount;
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static void __cpuidle_register_driver(struct cpuidle_driver *drv)
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{
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@ -89,8 +90,34 @@ void cpuidle_unregister_driver(struct cpuidle_driver *drv)
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}
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spin_lock(&cpuidle_driver_lock);
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if (!WARN_ON(cpuidle_driver_refcount > 0))
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cpuidle_curr_driver = NULL;
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spin_unlock(&cpuidle_driver_lock);
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}
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EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
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struct cpuidle_driver *cpuidle_driver_ref(void)
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{
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struct cpuidle_driver *drv;
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spin_lock(&cpuidle_driver_lock);
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drv = cpuidle_curr_driver;
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cpuidle_driver_refcount++;
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spin_unlock(&cpuidle_driver_lock);
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return drv;
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}
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void cpuidle_driver_unref(void)
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{
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spin_lock(&cpuidle_driver_lock);
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if (!WARN_ON(cpuidle_driver_refcount <= 0))
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cpuidle_driver_refcount--;
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spin_unlock(&cpuidle_driver_lock);
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}
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@ -136,7 +136,9 @@ struct cpuidle_driver {
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extern void disable_cpuidle(void);
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extern int cpuidle_idle_call(void);
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extern int cpuidle_register_driver(struct cpuidle_driver *drv);
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struct cpuidle_driver *cpuidle_get_driver(void);
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extern struct cpuidle_driver *cpuidle_get_driver(void);
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extern struct cpuidle_driver *cpuidle_driver_ref(void);
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extern void cpuidle_driver_unref(void);
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extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
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extern int cpuidle_register_device(struct cpuidle_device *dev);
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extern void cpuidle_unregister_device(struct cpuidle_device *dev);
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@ -157,6 +159,8 @@ static inline int cpuidle_idle_call(void) { return -ENODEV; }
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static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
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{return -ENODEV; }
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static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }
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static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; }
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static inline void cpuidle_driver_unref(void) {}
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static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
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static inline int cpuidle_register_device(struct cpuidle_device *dev)
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{return -ENODEV; }
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