> So what am I missing here?
>
The atomic increment of a reference count:
struct qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
{
struct qib_qp *qp = NULL;
rcu_read_lock();
if (unlikely(qpn <= 1)) {
if (qpn == 0)
qp = rcu_dereference(ibp->qp0);
else
qp = rcu_dereference(ibp->qp1);
if (qp)
atomic_inc(&qp->refcount); <--------------------------
} else {
struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
unsigned n = qpn_hash(dev, qpn);
for (qp = rcu_dereference(dev->qp_table[n]); qp;
qp = rcu_dereference(qp->next))
if (qp->ibqp.qp_num == qpn) {
atomic_inc(&qp->refcount);
<---------------------
break;
}
}
rcu_read_unlock();
return qp;
}
Mike
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
