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PM / runtime: Add new helper for conditional usage count incrementation

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Introduce a new runtime PM function, pm_runtime_get_if_in_use(),
that will increment the device's runtime PM usage counter and
return 1 if its status is RPM_ACTIVE and its usage counter
is greater than 0 at the same time (0 will be returned otherwise).

This is useful for things that should only be done if the device
is active (from the runtime PM perspective) and used by somebody
(as indicated by the usage counter) already and they are not worth
bothering otherwise.

Requested-by: Imre Deak <[email protected]>
Reviewed-by: Ulf Hansson <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2015-12-17 02:54:26 +01:00
commit a436b6a19f
3 changed files with 35 additions and 0 deletions
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6
Documentation/power/runtime_pm.txt
View file

@ -371,6 +371,12 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
- increment the device's usage counter, run pm_runtime_resume(dev) and
return its result
int pm_runtime_get_if_in_use(struct device *dev);
- return -EINVAL if 'power.disable_depth' is nonzero; otherwise, if the
runtime PM status is RPM_ACTIVE and the runtime PM usage counter is
nonzero, increment the counter and return 1; otherwise return 0 without
changing the counter
void pm_runtime_put_noidle(struct device *dev);
- decrement the device's usage counter