static void release_in_xmit(struct rds_connection *conn)
{
	clear_bit(RDS_IN_XMIT, &conn->c_flags);
	smp_mb__after_atomic();
	/*
	 * We don't use wait_on_bit()/wake_up_bit() because our waking is in a
	 * hot path and finding waiters is very rare.  We don't want to walk
	 * the system-wide hashed waitqueue buckets in the fast path only to
	 * almost never find waiters.
	 */
	if (waitqueue_active(&conn->c_waitq))
		wake_up_all(&conn->c_waitq);
}

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.