[PATCH 3/5] drm/syncobj: add sync_file interaction.

[Chris Wilson]

Quoting Dave Airlie (2017-05-12 01:34:55)
> @@ -385,6 +434,13 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
>         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
>                 return -ENODEV;
>  
> +       if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE_FENCE)
> +               return drm_syncobj_import_sync_file_fence(file_private,
> +                                                         args->fd,
> +                                                         args->handle);
> +       else if (args->flags)
> +               return -EINVAL;

Argh, what I missed before was that importing from a sync_file reuses
the handle, but importing from a syncobj fd creates a new handle.

Just venting my ocd. It would be nice if the interface was consistent,
and I can see arguments for both approaches (just not a good argument as
to why they should differ). A compromise would be a flag to create/reuse
handle (or if handle=0, create, if handle!=0 resuse).
-Chris