[PATCH v2 6/7] drm/mgag200: Replace ttm_bo_unref with ttm_bo_put

[Thomas Zimmermann]

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 at suse.de>
---
 drivers/gpu/drm/mgag200/mgag200_main.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_main.c b/drivers/gpu/drm/mgag200/mgag200_main.c
index 79d54103d470..163255099779 100644
--- a/drivers/gpu/drm/mgag200/mgag200_main.c
+++ b/drivers/gpu/drm/mgag200/mgag200_main.c
@@ -33,7 +33,7 @@ int mgag200_framebuffer_init(struct drm_device *dev,
 			     struct drm_gem_object *obj)
 {
 	int ret;
-	
+
 	drm_helper_mode_fill_fb_struct(dev, &gfb->base, mode_cmd);
 	gfb->obj = obj;
 	ret = drm_framebuffer_init(dev, &gfb->base, &mga_fb_funcs);
@@ -318,13 +318,9 @@ int mgag200_dumb_create(struct drm_file *file,
 
 static void mgag200_bo_unref(struct mgag200_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;
 }
 
-- 
2.20.1