RE: [PATCH 5/6 v2] IB: IP address based RDMA connection manager

[Sean Hefty]

> > +static void cma_detach_from_dev(struct rdma_id_private *id_priv)
> > +{
> > +	list_del(&id_priv->list);
> > +	if (atomic_dec_and_test(&id_priv->cma_dev->refcount))
> > +		wake_up(&id_priv->cma_dev->wait);
> > +	id_priv->cma_dev = NULL;
> > +}
>
>doesn't need to do atomic_dec_and_test(), because it is never dropping
>the last reference to id_priv (and in fact if it was, the last line
>would be a use-after-free bug).

It's dropping the reference on cma_dev, as opposed to id_priv.

- Sean

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