drm/i915: Error checks in gen6_set_rps
With the new "standardized" sysfs interfaces we need to be a bit more careful about setting the RPS values. Because the sysfs code and the rps workqueue can run at the same time, if the sysfs setter wins the race to the mutex, the workqueue can come in and set a value which is out of range (ie. we're no longer protecting by RPINTLIM). I was not able to actually make this error occur in testing. Signed-off-by: NBen Widawsky <ben@bwidawsk.net> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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