On Thu, Jun 02, 2022 at 07:19:46PM +0200, Eric Farman wrote: > @@ -125,6 +127,18 @@ extern struct mdev_driver vfio_ccw_mdev_driver; > extern const struct mdev_parent_ops vfio_ccw_mdev_ops; > extern const struct vfio_device_ops vfio_ccw_dev_ops; > > +static inline struct vfio_ccw_private *vfio_ccw_get_private(struct subchannel *sch) > +{ > + struct vfio_ccw_private *private; > + > + if (!sch) > + return NULL; WARN_ON? Jason