drm/qxl: Replace ttm_bo_unref with ttm_bo_put

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>
Link: http://patchwork.freedesktop.org/patch/msgid/20180731063559.11629-1-tzimmermann@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/drivers/gpu/drm/qxl/qxl_gem.c b/drivers/gpu/drm/qxl/qxl_gem.c
index f5c1e7872e920d3a0a3c9e7ec0b0bcfa5779def8..89606c819d82095bff00fc4804c01924831e93c8 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_gem.c
+++ b/drivers/gpu/drm/qxl/qxl_gem.c
@@ -40,7 +40,7 @@ void qxl_gem_object_free(struct drm_gem_object *gobj)
        qxl_surface_evict(qdev, qobj, false);
 
        tbo = &qobj->tbo;
-       ttm_bo_unref(&tbo);
+       ttm_bo_put(tbo);
 }
 
 int qxl_gem_object_create(struct qxl_device *qdev, int size,