The function ttm_bo_put releases a reference to a TTM buffer object. The function's name is more aligned to the Linux kernel convention of naming ref-counting function _get and _put.
A call to ttm_bo_unref takes the address of the TTM BO object's pointer and clears the pointer's value to NULL. This is not necessary in most cases and sometimes even worked around by the calling code. A call to ttm_bo_put only releases the reference without clearing the pointer.
The current behaviour of cleaning the pointer is kept in the calling code, but should be removed if not required in a later patch.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- drivers/gpu/drm/nouveau/nouveau_bo.h | 2 +- drivers/gpu/drm/nouveau/nouveau_gem.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h index 3920134cb132..e7b3d4d90aee 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bo.h +++ b/drivers/gpu/drm/nouveau/nouveau_bo.h @@ -70,7 +70,7 @@ nouveau_bo_ref(struct nouveau_bo *ref, struct nouveau_bo **pnvbo) if (prev) { struct ttm_buffer_object *bo = &prev->bo;
- ttm_bo_unref(&bo); + ttm_bo_put(bo); }
return 0; diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c index b56524d343c3..d0805364d3c1 100644 --- a/drivers/gpu/drm/nouveau/nouveau_gem.c +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c @@ -56,7 +56,7 @@ nouveau_gem_object_del(struct drm_gem_object *gem)
/* reset filp so nouveau_bo_del_ttm() can test for it */ gem->filp = NULL; - ttm_bo_unref(&bo); + ttm_bo_put(bo);
pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev);