Commit 6c540317 authored by Christian König's avatar Christian König
Browse files

drm/ttm: make ttm_bo_unpin more defensive 



We seem to have some more driver bugs than thought.

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Fixes: deb0814b ("drm/ttm: add ttm_bo_pin()/ttm_bo_unpin() v2")
Acked-by: default avatarMatthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210312093810.2202-1-christian.koenig@amd.com
parent de066e11

include/drm/ttm/ttm_bo_api.h

+4 −2
Original line number Diff line number Diff line
@@ -612,9 +612,11 @@ 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);

	WARN_ON_ONCE(!kref_read(&bo->kref));

	if (bo->pin_count)

		--bo->pin_count;

	else

		WARN_ON_ONCE(true);

}



int ttm_mem_evict_first(struct ttm_bo_device *bdev,