void rds_rdma_send_complete(struct rds_message *rm, int status)
{
	struct rds_sock *rs = NULL;
	struct rm_rdma_op *ro;
	struct rds_notifier *notifier;
	unsigned long flags;

	spin_lock_irqsave(&rm->m_rs_lock, flags);

	ro = &rm->rdma;
	if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) &&
	    ro->op_active && ro->op_notify && ro->op_notifier) {
		notifier = ro->op_notifier;
		rs = rm->m_rs;
		sock_hold(rds_rs_to_sk(rs));

		notifier->n_status = status;
		spin_lock(&rs->rs_lock);
		list_add_tail(&notifier->n_list, &rs->rs_notify_queue);
		spin_unlock(&rs->rs_lock);

		ro->op_notifier = NULL;
	}

	spin_unlock_irqrestore(&rm->m_rs_lock, flags);

	if (rs) {
		rds_wake_sk_sleep(rs);
		sock_put(rds_rs_to_sk(rs));
	}
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.