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igt_mmap_offset_exhaustion() selftest was using live requests to make an object busy, but we did not hold a runtime pm wakeref for submitting the requests. Acquire it to avoid triggering "RPM wakelock ref not held during HW access" warnings. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170411234427.14841-3-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>