Should multiple PRIME_FD_TO_HANDLE ioctls on the same fd require multiple GEM_CLOSE?

Hi

I've a question about expected behavior. I am using the "vc4" backend.

If I convert a dmabuf fd to a bo handle twice using DRM_IOCTL_PRIME_FD_TO_HANDLE then I get the same bo handle both times - fair enough.

If I then close it twice with DRM_IOCTL_GEM_CLOSE then the second time fails.

Is this expected behavior? I think I would have hoped that the PRIME_FD_TO_HANDLE ops would have incremented a ref count on the object and it would need to be CLOSED as many times as it was "opened" otherwise one bit of code can accidentally close a bo handle that was in use in another.

Many thanks

John Cox