On Mon, Jan 18, 2021 at 07:03:34PM +0100, Christian König wrote: > diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c > index 6e74e6745eca..f51458615158 100644 > --- a/drivers/gpu/drm/drm_syncobj.c > +++ b/drivers/gpu/drm/drm_syncobj.c > @@ -387,6 +387,13 @@ int drm_syncobj_find_fence(struct drm_file *file_private, > if (!syncobj) > return -ENOENT; > > + /* Waiting for userspace with locks help is illegal cause that can > + * trivial deadlock with page faults for example. Make lockdep complain > + * about it early on. > + */ Egads, the cursed comment style is spreading :/ > + if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) > + lockdep_assert_none_held_once(); > + Should this not be part of drm_syncobj_fence_add_wait() instead? Also, do you want to sprinkle might_sleep() around ? > *fence = drm_syncobj_fence_get(syncobj); > drm_syncobj_put(syncobj); > > diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
