drm/kms: Duct-tape for mode object lifetime checks

commit 4f5368b5541a902f6596558b05f5c21a9770dd32
Author: Daniel Vetter <[e-mail]>
Date: Fri Jun 14 08:17:23 2019 +0200

drm/kms: Catch mode_object lifetime errors

uncovered a bit a mess in dp drivers. Most drivers (from a quick look,
all except i915) register all the dp stuff in their init code, which
is too early. With CONFIG_DRM_DP_AUX_CHARDEV this will blow up,
because drm_dp_aux_register tries to add a child to a device in sysfs
(the connector) which doesn't even exist yet.

No one seems to have cared thus far. But with the above change I also
moved the setting of dev->registered after the ->load callback, in an
attempt to keep old drivers from hitting any WARN_ON backtraces. But
that moved radeon.ko from the "working, by accident" to "now also
broken" category.

Since this is a huge mess I figured a revert would be simplest. But
this check has already caught issues in i915:

commit 1b9bd09630d4db4827cc04d358a41a16a6bc2cb0
Author: Ville Syrjälä <[e-mail]>
Date: Tue Aug 20 19:16:57 2019 +0300

drm/i915: Do not create a new max_bpc prop for MST connectors

Hence I'd like to retain it. Fix the radeon regression by moving the
setting of dev->registered back to were it was, and stop the
backtraces with an explicit check for dev->driver->load.

Everyone else will stay as broken with CONFIG_DRM_DP_AUX_CHARDEV. The
next patch will improve the kerneldoc and add a todo entry for this.

Fixes: 4f5368b5541a ("drm/kms: Catch mode_object lifetime errors")
Cc: Sean Paul <[e-mail]>
Cc: Maarten Lankhorst <[e-mail]>
Reported-by: Michel Dänzer <[e-mail]>
Reviewed-by: Michel Dänzer <[e-mail]>
Tested-by: Michel Dänzer <[e-mail]>
Cc: Michel Dänzer <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_drv.c

···
 	if (ret)
 		goto err_minors;
 
+	dev->registered = true;
+
 	if (dev->driver->load) {
 		ret = dev->driver->load(dev, flags);
 		if (ret)
 			goto err_minors;
 	}
-
-	dev->registered = true;
 
 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		drm_modeset_register_all(dev);

drivers/gpu/drm/drm_mode_object.c

···
 {
 	int ret;
 
-	WARN_ON(dev->registered && !obj_free_cb);
+	WARN_ON(!dev->driver->load && dev->registered && !obj_free_cb);
 
 	mutex_lock(&dev->mode_config.idr_mutex);
 	ret = idr_alloc(&dev->mode_config.object_idr, register_obj ? obj : NULL,
···
 void drm_mode_object_unregister(struct drm_device *dev,
 				struct drm_mode_object *object)
 {
-	WARN_ON(dev->registered && !object->free_cb);
+	WARN_ON(!dev->driver->load && dev->registered && !object->free_cb);
 
 	mutex_lock(&dev->mode_config.idr_mutex);
 	if (object->id) {