[Intel-gfx] [PATCH v2] PM / Runtime: Introduce pm_runtime_get_noidle

[Rafael J. Wysocki]

On Wednesday, December 09, 2015 06:22:19 PM Joonas Lahtinen wrote:
> Introduce pm_runtime_get_noidle to for situations where it is not
> desireable to touch an idling device. One use scenario is periodic
> hangchecks performed by the drm/i915 driver which can be omitted
> on a device in a runtime idle state.
> 
> v2:
> - Fix inconsistent return value when !CONFIG_PM.
> - Update documentation for bool return value
> 
> Signed-off-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Reported-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: "Rafael J. Wysocki" <rjw at rjwysocki.net>
> Cc: linux-pm at vger.kernel.org

Well, I don't quite see how this can be used in a non-racy way
without doing an additional pm_runtime_resume() or something like
that in the same code path.

Thanks,
Rafael