nvkm_chid_put
nvkm_chid_put(runl->cgid, cgrp->id, &cgrp->lock);
nvkm_chid_put(chan->cgrp->runl->chid, chan->id, &chan->cgrp->lock);
void nvkm_chid_put(struct nvkm_chid *, int id, spinlock_t *data_lock);