ath9k_hw_getnf
if (ath9k_hw_getnf(ah, chan)) {
if (longcal && ath9k_hw_getnf(ah, chan)) {
EXPORT_SYMBOL(ath9k_hw_getnf);
ath9k_hw_getnf(ah, ah->curchan);
bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan);
ath9k_hw_getnf(ah, ah->curchan);