Merge branch 'linux-4.18' of git://github.com/skeggsb/linux into drm-fixes

Single nouveau regression fix.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/CACAvsv5VDDKaYKJShyVAGK0MJAHMZOJ02FKQ_aW5DnBCNVgRUw@mail.gmail.com

drivers/gpu/drm/nouveau/dispnv50/curs507a.c

@@ -132,7 +132,7 @@ curs507a_new_(const struct nv50_wimm_func *func, struct nouveau_drm *drm,
 
 	nvif_object_map(&wndw->wimm.base.user, NULL, 0);
 	wndw->immd = func;
-	wndw->ctxdma.parent = &disp->core->chan.base.user;
+	wndw->ctxdma.parent = NULL;
 	return 0;
 }
 

drivers/gpu/drm/nouveau/dispnv50/wndw.c

@@ -444,14 +444,17 @@ nv50_wndw_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
 	if (ret)
 		return ret;
 
-	ctxdma = nv50_wndw_ctxdma_new(wndw, fb);
-	if (IS_ERR(ctxdma)) {
-		nouveau_bo_unpin(fb->nvbo);
-		return PTR_ERR(ctxdma);
+	if (wndw->ctxdma.parent) {
+		ctxdma = nv50_wndw_ctxdma_new(wndw, fb);
+		if (IS_ERR(ctxdma)) {
+			nouveau_bo_unpin(fb->nvbo);
+			return PTR_ERR(ctxdma);
+		}
+
+		asyw->image.handle[0] = ctxdma->object.handle;
 	}
 
 	asyw->state.fence = reservation_object_get_excl_rcu(fb->nvbo->bo.resv);
-	asyw->image.handle[0] = ctxdma->object.handle;
 	asyw->image.offset[0] = fb->nvbo->bo.offset;
 
 	if (wndw->func->prepare) {