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[ Upstream commit60a2c0c12b] Tear down ttm range manager for doorbell in function amdgpu_ttm_fini(), to avoid memory leakage. Fixes:792b84fb90("drm/amdgpu: initialize ttm for doorbells") Signed-off-by: Jiang Liu <gerry@linux.alibaba.com> Signed-off-by: Kent Russell <kent.russell@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org>