Re: [PATCH v1 02/14] vfio: Update vfio_add_group_dev() API

[Christoph Hellwig]

On Mon, Mar 08, 2021 at 02:47:40PM -0700, Alex Williamson wrote:
> Rather than an errno, return a pointer to the opaque vfio_device
> to allow the bus driver to call into vfio-core without additional
> lookups and references.  Note that bus drivers are still required
> to use vfio_del_group_dev() to teardown the vfio_device.
> 
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>

This looks like it is superseded by the

  vfio: Split creation of a vfio_device into init and register ops

patch from Jason, which provides a much nicer API.