drm/ttm: make ttm_bo_unpin more defensive
We seem to have some more driver bugs than thought. Signed-off-by: Christian König <christian.koenig@amd.com> Fixes: deb0814b ("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
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