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Now that everything above has been converted to use requests, intel_ring_begin() can be updated to take a request instead of a ring. This also means that it no longer needs to lazily allocate a request if no-one happens to have done it earlier. For: VIZ-5115 Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Reviewed-by: Tomas Elf <tomas.elf@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>