diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-06-14 09:17:23 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-07-10 18:17:14 +0300 |
| commit | 4f5368b5541a902f6596558b05f5c21a9770dd32 (patch) | |
| tree | 8630efb14338199c1333ca223d1d1a3b3d6bac3c /drivers/gpu/drm/drm_mode_object.c | |
| parent | d006a9b63d4bbb3eb1e2e616712d45acfcda7042 (diff) | |
| download | linux-4f5368b5541a902f6596558b05f5c21a9770dd32.tar.xz | |
drm/kms: Catch mode_object lifetime errors
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@poorly.run>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190614061723.1173-1-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/gpu/drm/drm_mode_object.c')
| -rw-r--r-- | drivers/gpu/drm/drm_mode_object.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c index 1c6e51135962..c355ba8e6d5d 100644 --- a/drivers/gpu/drm/drm_mode_object.c +++ b/drivers/gpu/drm/drm_mode_object.c @@ -42,6 +42,8 @@ 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); @@ -102,6 +104,8 @@ 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); |