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UPSTREAM: drm/virtio: Replace ttm_bo_unref with ttm_bo_put

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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/20180731062127.10131-3-tzimmermann@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 0e7a3d4b66)
Signed-off-by: Greg Hartman <ghartman@google.com>
BUG: 139386237
Change-Id: I014fa5f259fafd3b8ea691adc993eaffc46dd5dc
This commit is contained in:
Thomas Zimmermann
2018-07-31 08:21:27 +02:00
committed by Alistair Delva
parent aff367cb6a
commit a6147c0eb5
1 changed files with 2 additions and 3 deletions
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5
drivers/gpu/drm/virtio/virtgpu_drv.h
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@@ -383,9 +383,8 @@ static inline void virtio_gpu_object_unref(struct virtio_gpu_object **bo)
if ((*bo) == NULL)
return;
tbo = &((*bo)->tbo);
ttm_bo_unref(&tbo);
if (tbo == NULL)
*bo = NULL;
ttm_bo_put(tbo);
*bo = NULL;
}
static inline u64 virtio_gpu_object_mmap_offset(struct virtio_gpu_object *bo)