IEEE80211_CHAN_NO_20MHZ
chan->flags |= IEEE80211_CHAN_NO_20MHZ;
prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
(IEEE80211_CHAN_NO_10MHZ | IEEE80211_CHAN_NO_20MHZ))
if ((chan->flags & IEEE80211_CHAN_NO_20MHZ) &&
bw_flags |= IEEE80211_CHAN_NO_20MHZ;
bw_flags |= IEEE80211_CHAN_NO_20MHZ;
chan->flags &= ~IEEE80211_CHAN_NO_20MHZ;