LOCKD: fix races in nsm_client_get

	return rpc_create(&args);

}

static struct rpc_clnt *nsm_client_get(struct net *net)

static struct rpc_clnt *nsm_client_set(struct lockd_net *ln,

		struct rpc_clnt *clnt)

{

	static DEFINE_MUTEX(nsm_create_mutex);

	struct rpc_clnt	*clnt;

	struct lockd_net *ln = net_generic(net, lockd_net_id);

	spin_lock(&ln->nsm_clnt_lock);

	if (ln->nsm_users) {

		ln->nsm_users++;

		clnt = ln->nsm_clnt;

		spin_unlock(&ln->nsm_clnt_lock);

	if (ln->nsm_users == 0) {

		if (clnt == NULL)

			goto out;

		ln->nsm_clnt = clnt;

	}

	clnt = ln->nsm_clnt;

	ln->nsm_users++;

out:

	spin_unlock(&ln->nsm_clnt_lock);

	mutex_lock(&nsm_create_mutex);

	clnt = nsm_create(net);

	if (!IS_ERR(clnt)) {

		ln->nsm_clnt = clnt;

		smp_wmb();

		ln->nsm_users = 1;

	return clnt;

}

	mutex_unlock(&nsm_create_mutex);

static struct rpc_clnt *nsm_client_get(struct net *net)

{

	struct rpc_clnt	*clnt, *new;

	struct lockd_net *ln = net_generic(net, lockd_net_id);

	clnt = nsm_client_set(ln, NULL);

	if (clnt != NULL)

		goto out;

	clnt = new = nsm_create(net);

	if (IS_ERR(clnt))

		goto out;

	clnt = nsm_client_set(ln, new);

	if (clnt != new)

		rpc_shutdown_client(new);

out:

	return clnt;

}