Sync gem vm_node.start with ttm vm_node.start,
then we can just call drm_gem_prime_mmap().

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_prime.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c 
b/drivers/gpu/drm/virtio/virtgpu_prime.c
index c59ec34c80a5..b4c9199349e7 100644
--- a/drivers/gpu/drm/virtio/virtgpu_prime.c
+++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
@@ -56,7 +56,10 @@ void virtgpu_gem_prime_vunmap(struct drm_gem_object *obj, 
void *vaddr)
 }
 
 int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,
-                      struct vm_area_struct *area)
+                          struct vm_area_struct *vma)
 {
-       return -ENODEV;
+       struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+
+       bo->gem_base.vma_node.vm_node.start = bo->tbo.vma_node.vm_node.start;
+       return drm_gem_prime_mmap(obj, vma);
 }
-- 
2.9.3

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