[PATCH v2] drm/gem: Fix mmap fake offset handling for drm_gem_object_funcs.mmap

[Gerd Hoffmann]

  Hi,

> Aside: the amdgpu isn't great because it's racy, userspace could have
> guessed the fd and already started an mmap before we managed to update
> stuff.

Can't see that race.  When I read the code correctly the fd is created
and installed (using dma_buf_fd) only after dmabuf setup is finished.

cheers,
  Gerd