static int ath_txstatus_setup(struct ath_softc *sc, int size)
{
	struct ath_descdma *dd = &sc->txsdma;
	u8 txs_len = sc->sc_ah->caps.txs_len;

	dd->dd_desc_len = size * txs_len;
	dd->dd_desc = dmam_alloc_coherent(sc->dev, dd->dd_desc_len,
					  &dd->dd_desc_paddr, GFP_KERNEL);
	if (!dd->dd_desc)
		return -ENOMEM;

	return 0;
}

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.