drm/nouveau/disp: add supervisor mutex
Will be used to protect NVIF_CLASS_OUTP method calls from racing with in-progress supervisor handling. Signed-off-by:Ben Skeggs <bskeggs@redhat.com> Reviewed-by:
Lyude Paul <lyude@redhat.com> Signed-off-by:
Dave Airlie <airlied@redhat.com>
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