Index: dist/drm/ttm/ttm_bo.c
===================================================================
RCS file: /cvsroot/src/sys/external/bsd/drm2/dist/drm/ttm/ttm_bo.c,v
retrieving revision 1.2
diff -p -r1.2 ttm_bo.c
*** dist/drm/ttm/ttm_bo.c	16 Jul 2014 20:59:57 -0000	1.2
--- dist/drm/ttm/ttm_bo.c	26 Jul 2014 06:09:41 -0000
*************** static void ttm_bo_release_list(struct k
*** 159,166 ****
  	BUG_ON(!list_empty(&bo->lru));
  	BUG_ON(!list_empty(&bo->ddestroy));
  
! 	if (bo->ttm)
  		ttm_tt_destroy(bo->ttm);
  	atomic_dec(&bo->glob->bo_count);
  	if (bo->resv == &bo->ttm_resv)
  		reservation_object_fini(&bo->ttm_resv);
--- 159,168 ----
  	BUG_ON(!list_empty(&bo->lru));
  	BUG_ON(!list_empty(&bo->ddestroy));
  
! 	if (bo->ttm) {
  		ttm_tt_destroy(bo->ttm);
+ 		bo->ttm = NULL;
+ 	}
  	atomic_dec(&bo->glob->bo_count);
  	if (bo->resv == &bo->ttm_resv)
  		reservation_object_fini(&bo->ttm_resv);