When submitting a fenced command we must lock the object reservations
because virtio_gpu_queue_fenced_ctrl_buffer() unlocks after adding the
fence.
Reported-by: NJann Horn <jannh@google.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NChia-I Wu <olvaffe@gmail.com>
Tested-by: NJann Horn <jannh@google.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200110094535.23472-1-kraxel@redhat.com