On Wed, Feb 12, 2014 at 01:59:30PM +0000, Marciniszyn, Mike wrote:
> > So what am I missing here?
> >
>
> The atomic increment of a reference count:
Got it, thank you, apologies for the noise!
Thanx, Paul
> 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
>
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