drm/i915: Replace i915_vma_put_fence()

Avoid calling i915_vma_put_fence() by using our alternate paths that
bind a secondary vma avoiding the original fenced vma. For the few
instances where we need to release the fence (i.e. on binding when the
GGTT range becomes invalid), replace the put_fence with a revoke_fence.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190822061557.18402-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/display/intel_overlay.c

@@ -770,10 +770,6 @@ static int intel_overlay_do_put_image(struct intel_overlay *overlay,
 	}
 	intel_frontbuffer_flush(new_bo->frontbuffer, ORIGIN_DIRTYFB);
 
-	ret = i915_vma_put_fence(vma);
-	if (ret)
-		goto out_unpin;
-
 	if (!overlay->active) {
 		u32 oconfig;