On Mon, May 23, 2016 at 3:20 PM, Yishai Hadas [off-list ref] wrote:

+int ib_destroy_wq(struct ib_wq *wq)
+{
+       int err;
+       struct ib_cq *cq = wq->cq;
+       struct ib_pd *pd = wq->pd;
+
+       if (atomic_read(&wq->usecnt))
+               return -EBUSY;
+
+       err = wq->device->destroy_wq(wq);
+       if (!err) {
+               atomic_dec(&pd->usecnt);
+               atomic_dec(&cq->usecnt);
+       }
+       return err;

by the reverse unwinding principle

+               atomic_inc(&pd->usecnt);
+               atomic_inc(&wq_attr->cq->usecnt);

-->

+               atomic_dec(&cq->usecnt);
+               atomic_dec(&pd->usecnt);

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