static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
					      struct poll_table_struct *wait)
{
	struct ib_uverbs_completion_event_file *comp_ev_file =
		filp->private_data;

	return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
}

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.