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This reverts commitf4c34b1e2a. Simliar to commita0cecc23cfRevert "drm/virtio: drop prime import/export callbacks". We have to do the same with qxl, for the same reasons (it breaks DRI3). Drop the WARN_ON_ONCE(). Fixes:f4c34b1e2a("drm/qxl: drop prime import/export callbacks") Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Link: http://patchwork.freedesktop.org/patch/msgid/20190426053324.26443-1-kraxel@redhat.com Acked-by: Daniel Vetter <daniel@ffwll.ch>