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6559ff535c
commit f08f5a0add upstream.
There are some situations (e.g. in __pm_generic_call()), where
pm_runtime_suspended() is used to decide whether or not to execute
a device's (system) ->suspend() callback. The callback is not
executed if pm_runtime_suspended() returns true, but it does so
for devices that don't even support runtime PM, because the
power.disable_depth device field is ignored by it. This leads to
problems (i.e. devices are not suspened when they should), so rework
pm_runtime_suspended() so that it returns false if the device's
power.disable_depth field is different from zero.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
145 lines
4.6 KiB
C
145 lines
4.6 KiB
C
/*
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* pm_runtime.h - Device run-time power management helper functions.
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*
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* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
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*
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* This file is released under the GPLv2.
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*/
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#ifndef _LINUX_PM_RUNTIME_H
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#define _LINUX_PM_RUNTIME_H
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#include <linux/device.h>
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#include <linux/pm.h>
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#ifdef CONFIG_PM_RUNTIME
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extern struct workqueue_struct *pm_wq;
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extern int pm_runtime_idle(struct device *dev);
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extern int pm_runtime_suspend(struct device *dev);
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extern int pm_runtime_resume(struct device *dev);
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extern int pm_request_idle(struct device *dev);
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extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
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extern int pm_request_resume(struct device *dev);
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extern int __pm_runtime_get(struct device *dev, bool sync);
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extern int __pm_runtime_put(struct device *dev, bool sync);
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extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
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extern int pm_runtime_barrier(struct device *dev);
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extern void pm_runtime_enable(struct device *dev);
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extern void __pm_runtime_disable(struct device *dev, bool check_resume);
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extern void pm_runtime_allow(struct device *dev);
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extern void pm_runtime_forbid(struct device *dev);
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extern int pm_generic_runtime_idle(struct device *dev);
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extern int pm_generic_runtime_suspend(struct device *dev);
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extern int pm_generic_runtime_resume(struct device *dev);
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static inline bool pm_children_suspended(struct device *dev)
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{
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return dev->power.ignore_children
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|| !atomic_read(&dev->power.child_count);
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}
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static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
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{
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dev->power.ignore_children = enable;
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}
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static inline void pm_runtime_get_noresume(struct device *dev)
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{
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atomic_inc(&dev->power.usage_count);
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}
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static inline void pm_runtime_put_noidle(struct device *dev)
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{
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atomic_add_unless(&dev->power.usage_count, -1, 0);
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}
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static inline bool device_run_wake(struct device *dev)
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{
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return dev->power.run_wake;
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}
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static inline void device_set_run_wake(struct device *dev, bool enable)
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{
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dev->power.run_wake = enable;
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}
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static inline bool pm_runtime_suspended(struct device *dev)
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{
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return dev->power.runtime_status == RPM_SUSPENDED
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&& !dev->power.disable_depth;
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}
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#else /* !CONFIG_PM_RUNTIME */
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static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
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static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; }
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static inline int pm_runtime_resume(struct device *dev) { return 0; }
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static inline int pm_request_idle(struct device *dev) { return -ENOSYS; }
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static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
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{
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return -ENOSYS;
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}
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static inline int pm_request_resume(struct device *dev) { return 0; }
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static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; }
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static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; }
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static inline int __pm_runtime_set_status(struct device *dev,
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unsigned int status) { return 0; }
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static inline int pm_runtime_barrier(struct device *dev) { return 0; }
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static inline void pm_runtime_enable(struct device *dev) {}
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static inline void __pm_runtime_disable(struct device *dev, bool c) {}
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static inline void pm_runtime_allow(struct device *dev) {}
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static inline void pm_runtime_forbid(struct device *dev) {}
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static inline bool pm_children_suspended(struct device *dev) { return false; }
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static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
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static inline void pm_runtime_get_noresume(struct device *dev) {}
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static inline void pm_runtime_put_noidle(struct device *dev) {}
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static inline bool device_run_wake(struct device *dev) { return false; }
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static inline void device_set_run_wake(struct device *dev, bool enable) {}
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static inline bool pm_runtime_suspended(struct device *dev) { return false; }
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static inline int pm_generic_runtime_idle(struct device *dev) { return 0; }
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static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
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static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
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#endif /* !CONFIG_PM_RUNTIME */
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static inline int pm_runtime_get(struct device *dev)
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{
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return __pm_runtime_get(dev, false);
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}
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static inline int pm_runtime_get_sync(struct device *dev)
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{
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return __pm_runtime_get(dev, true);
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}
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static inline int pm_runtime_put(struct device *dev)
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{
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return __pm_runtime_put(dev, false);
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}
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static inline int pm_runtime_put_sync(struct device *dev)
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{
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return __pm_runtime_put(dev, true);
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}
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static inline int pm_runtime_set_active(struct device *dev)
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{
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return __pm_runtime_set_status(dev, RPM_ACTIVE);
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}
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static inline void pm_runtime_set_suspended(struct device *dev)
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{
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__pm_runtime_set_status(dev, RPM_SUSPENDED);
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}
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static inline void pm_runtime_disable(struct device *dev)
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{
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__pm_runtime_disable(dev, true);
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}
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#endif
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