On Mon, Feb 27, 2023 at 03:11:30AM -0800, Yi Liu wrote: > @@ -535,7 +542,8 @@ static int vfio_device_fops_release(struct inode *inode, struct file *filep) > struct vfio_device_file *df = filep->private_data; > struct vfio_device *device = df->device; > > - vfio_device_group_close(df); > + if (!df->is_cdev_device) > + vfio_device_group_close(df); This hunk should go in another patch Jason