On Wed, Oct 23, 2019 at 04:49:52PM +0200, Daniel Vetter wrote:
> Properties can't be attached after registering, userspace would get
> confused (no one bothers to reprobe really).
>
> - Add kerneldoc
> - Enforce this with some checks. This needs a somewhat ugly check
> since connectors can be added later on, but we still need to attach
> all properties before they go public.
>
> Note that we already enforce that properties themselves are created
> before the entire device is registered.
>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Rajat Jain <rajatja@xxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_mode_object.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
> index 6a23e36ed4fe..35c2719407a8 100644
> --- a/drivers/gpu/drm/drm_mode_object.c
> +++ b/drivers/gpu/drm/drm_mode_object.c
> @@ -224,12 +224,26 @@ EXPORT_SYMBOL(drm_mode_object_get);
> * This attaches the given property to the modeset object with the given initial
> * value. Currently this function cannot fail since the properties are stored in
> * a statically sized array.
> + *
> + * Note that all properties must be attached before the object itself is
> + * registered and accessible from userspace.
> */
> void drm_object_attach_property(struct drm_mode_object *obj,
> struct drm_property *property,
> uint64_t init_val)
> {
> int count = obj->properties->count;
> + struct drm_device *dev = property->dev;
> +
> +
> + if (obj->type == DRM_MODE_OBJECT_CONNECTOR) {
> + struct drm_connector *connector = obj_to_connector(obj);
> +
> + WARN_ON(!dev->driver->load &&
> + connector->registration_state == DRM_CONNECTOR_REGISTERED);
> + } else {
> + WARN_ON(!dev->driver->load && dev->registered);
> + }
I'm not sure I understand why dev->driver->load needs to be a special
case. Don't the same rules apply for those drivers as well?
Thierry
>
> if (count == DRM_OBJECT_MAX_PROPERTY) {
> WARN(1, "Failed to attach object property (type: 0x%x). Please "
> --
> 2.23.0
>
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