drm/nv50-nvc0: lookup pushbuf virtual address on dma_push

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_dma.c

@@ -167,8 +167,13 @@ nv50_dma_push(struct nouveau_channel *chan, struct nouveau_bo *bo,
 	      int delta, int length)
 {
 	struct nouveau_bo *pb = chan->pushbuf_bo;
-	uint64_t offset = bo->vma.offset + delta;
+	struct nouveau_vma *vma;
 	int ip = (chan->dma.ib_put * 2) + chan->dma.ib_base;
+	u64 offset;
+
+	vma = nouveau_bo_vma_find(bo, chan->vm);
+	BUG_ON(!vma);
+	offset = vma->offset + delta;
 
 	BUG_ON(chan->dma.ib_free < 1);
 	nouveau_bo_wr32(pb, ip++, lower_32_bits(offset));