From: Daniel Vetter <daniel.vetter@xxxxxxxx> [ Upstream commit 4f5368b5541a902f6596558b05f5c21a9770dd32 ] Only dynamic mode objects, i.e. those which are refcounted and have a free callback, can be added while the overall drm_device is visible to userspace. All others must be added before drm_dev_register and removed after drm_dev_unregister. Small issue around drivers still using the load/unload callbacks, we need to make sure we set dev->registered so that load/unload code in these callbacks doesn't trigger false warnings. Only a small adjustement in drm_dev_register was needed. Motivated by some irc discussions about object ids of dynamic objects like blobs become invalid, and me going on a bit an audit spree. Reviewed-by: Sean Paul <sean@xxxxxxxxxx> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20190614061723.1173-1-daniel.vetter@xxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/drm_drv.c | 4 ++-- drivers/gpu/drm/drm_mode_object.c | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 862621494a93e..6a651bf540b3b 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -987,14 +987,14 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags) 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); diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c index f32507e65b794..7f291f88156fc 100644 --- a/drivers/gpu/drm/drm_mode_object.c +++ b/drivers/gpu/drm/drm_mode_object.c @@ -37,6 +37,8 @@ int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj, { int ret; + WARN_ON(dev->registered && !obj_free_cb); + mutex_lock(&dev->mode_config.idr_mutex); ret = idr_alloc(&dev->mode_config.object_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL); @@ -97,6 +99,8 @@ void drm_mode_object_register(struct drm_device *dev, void drm_mode_object_unregister(struct drm_device *dev, struct drm_mode_object *object) { + WARN_ON(dev->registered && !object->free_cb); + mutex_lock(&dev->mode_config.idr_mutex); if (object->id) { idr_remove(&dev->mode_config.object_idr, object->id); -- 2.20.1
