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drm/ttm: make ttm_bo_unpin more defensive

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commit 6c5403173a13a08ff61dbdafa4c0ed4a9dedbfe0 upstream.

We seem to have some more driver bugs than thought.

Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: deb0814b43f3 ("drm/ttm: add ttm_bo_pin()/ttm_bo_unpin() v2")
Acked-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210312093810.2202-1-christian.koenig@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian König 2021-03-12 09:34:39 +01:00 committed by Greg Kroah-Hartman
parent c0f2b2b020
commit 4148f28f98
1 changed files with 4 additions and 2 deletions
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6
include/drm/ttm/ttm_bo_api.h
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@ -628,8 +628,10 @@ static inline void ttm_bo_pin(struct ttm_buffer_object *bo)
static inline void ttm_bo_unpin(struct ttm_buffer_object *bo)
{
dma_resv_assert_held(bo->base.resv);
WARN_ON_ONCE(!bo->pin_count);
--bo->pin_count;
if (bo->pin_count)
--bo->pin_count;
else
WARN_ON_ONCE(true);
}
int ttm_mem_evict_first(struct ttm_bo_device *bdev,