On Mon, Feb 13, 2023 at 07:13:36AM -0800, Yi Liu wrote:
> +static struct vfio_device *vfio_device_from_file(struct file *file)
> +{
> + struct vfio_device_file *df = file->private_data;
> +
> + if (file->f_op != &vfio_device_fops)
> + return NULL;
> + return df->device;
> +}
> +
> /**
> * vfio_file_is_valid - True if the file is usable with VFIO APIS
> * @file: VFIO group file or VFIO device file
> */
> bool vfio_file_is_valid(struct file *file)
> {
> - return vfio_group_from_file(file);
> + return vfio_group_from_file(file) ||
> + vfio_device_from_file(file);
> }
> EXPORT_SYMBOL_GPL(vfio_file_is_valid);
This can only succeed on a device cdev that has been fully opened.
Jason
