int ath_tx_init(struct ath_softc *sc, int nbufs)
{
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
	int error = 0;

	spin_lock_init(&sc->tx.txbuflock);

	error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf,
				  "tx", nbufs, 1, 1);
	if (error != 0) {
		ath_err(common,
			"Failed to allocate tx descriptors: %d\n", error);
		return error;
	}

	error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf,
				  "beacon", ATH_BCBUF, 1, 1);
	if (error != 0) {
		ath_err(common,
			"Failed to allocate beacon descriptors: %d\n", error);
		return error;
	}

	INIT_DELAYED_WORK(&sc->tx_complete_work, ath_tx_complete_poll_work);

	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
		error = ath_tx_edma_init(sc);

	return error;
}

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.