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.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- drivers/gpu/drm/ast/ast_main.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c index 373700c05a00..2854399856ba 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -639,13 +639,9 @@ int ast_dumb_create(struct drm_file *file,
static void ast_bo_unref(struct ast_bo **bo) { - struct ttm_buffer_object *tbo; - if ((*bo) == NULL) return; - - tbo = &((*bo)->bo); - ttm_bo_unref(&tbo); + ttm_bo_put(&((*bo)->bo)); *bo = NULL; }