static uint16_t nvme_del_cq(NvmeCtrl *n, NvmeRequest *req)
{
    NvmeDeleteQ *c = (NvmeDeleteQ *)&req->cmd;
    NvmeCQueue *cq;
    uint16_t qid = le16_to_cpu(c->qid);

    if (unlikely(!qid || nvme_check_cqid(n, qid))) {
        trace_pci_nvme_err_invalid_del_cq_cqid(qid);
        return NVME_INVALID_CQID | NVME_DNR;
    }

    cq = n->cq[qid];
    if (unlikely(!QTAILQ_EMPTY(&cq->sq_list))) {
        trace_pci_nvme_err_invalid_del_cq_notempty(qid);
        return NVME_INVALID_QUEUE_DEL;
    }

    if (cq->irq_enabled && cq->tail != cq->head) {
        n->cq_pending--;
    }

    nvme_irq_deassert(n, cq);
    trace_pci_nvme_del_cq(qid);
    nvme_free_cq(cq, n);
    return NVME_SUCCESS;
}
Unknown