drm/amdgpu: wait for moving fence after pinning

drm/amdgpu: wait for moving fence after pinning

commit 8ddf5b9bb479570a3825d70fecfb9399bc15700c upstream.

We actually need to wait for the moving fence after pinning
the BO to make sure that the pin is completed.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
References: https://lore.kernel.org/dri-devel/20210621151758.2347474-1-daniel.vetter@ffwll.ch/
CC: stable@kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210622114506.106349-3-christian.koenig@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>