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The pm_runtime_force_suspend|resume() helpers currently requires the device to at some level (PM domain, bus, etc), have the ->runtime_suspend|resume() callbacks assigned for it, else -ENOSYS is returned as an error. However, there are no reason for this requirement, so let's simply remove it by allowing these callbacks to be NULL. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>