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 <imre.deak@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Rafael J. Wysocki 2015-12-17 02:54:26 +01:00

parent d89d7ff9ed

commit a436b6a19f

3 changed files with 35 additions and 0 deletions

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include/linux/pm_runtime.h

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