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| author | Alan Stern <stern@rowland.harvard.edu> | 2010-12-01 00:14:42 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2010-12-24 15:02:41 +0100 |
| commit | c7b61de5b7b17f0df34dc7d2f8b9576f8bd36fce (patch) | |
| tree | d8cf6be1aab175839973d2c76060bd41d65b2ed5 /include/linux/pm_runtime.h | |
| parent | 5262a47502adcfc3a64403120768f528418a3b79 (diff) | |
| download | lwn-c7b61de5b7b17f0df34dc7d2f8b9576f8bd36fce.tar.gz lwn-c7b61de5b7b17f0df34dc7d2f8b9576f8bd36fce.zip | |
PM / Runtime: Add synchronous runtime interface for interrupt handlers (v3)
This patch (as1431c) makes the synchronous runtime-PM interface
suitable for use in interrupt handlers. Subsystems can call the new
pm_runtime_irq_safe() function to tell the PM core that a device's
runtime_suspend and runtime_resume callbacks should be invoked with
interrupts disabled and the spinlock held. This permits the
pm_runtime_get_sync() and the new pm_runtime_put_sync_suspend()
routines to be called from within interrupt handlers.
When a device is declared irq-safe in this way, the PM core increments
the parent's usage count, so the parent will never be runtime
suspended. This prevents difficult situations in which an irq-safe
device can't resume because it is forced to wait for its non-irq-safe
parent.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'include/linux/pm_runtime.h')
| -rw-r--r-- | include/linux/pm_runtime.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h index d19f1cca7f74..e9cc049ccb62 100644 --- a/include/linux/pm_runtime.h +++ b/include/linux/pm_runtime.h @@ -40,6 +40,7 @@ extern int pm_generic_runtime_idle(struct device *dev); extern int pm_generic_runtime_suspend(struct device *dev); extern int pm_generic_runtime_resume(struct device *dev); extern void pm_runtime_no_callbacks(struct device *dev); +extern void pm_runtime_irq_safe(struct device *dev); extern void __pm_runtime_use_autosuspend(struct device *dev, bool use); extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev); @@ -124,6 +125,7 @@ static inline int pm_generic_runtime_idle(struct device *dev) { return 0; } static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } static inline void pm_runtime_no_callbacks(struct device *dev) {} +static inline void pm_runtime_irq_safe(struct device *dev) {} static inline void pm_runtime_mark_last_busy(struct device *dev) {} static inline void __pm_runtime_use_autosuspend(struct device *dev, @@ -196,6 +198,11 @@ static inline int pm_runtime_put_sync(struct device *dev) return __pm_runtime_idle(dev, RPM_GET_PUT); } +static inline int pm_runtime_put_sync_suspend(struct device *dev) +{ + return __pm_runtime_suspend(dev, RPM_GET_PUT); +} + static inline int pm_runtime_put_sync_autosuspend(struct device *dev) { return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); |