drm/amdgpu: fix invalid fence handling in amdgpu_vm_tlb_flush
CPU based update doesn't produce a fence, handle such cases properly. Fixes: d8a3f0a0 ("drm/amdgpu: implement TLB flush fence") Signed-off-by: Lang Yu <lang.yu@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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