Function ieee80211_setupcurchan

freebsd/net80211/ieee80211_node.c:782–812

* Setup the current channel. The request channel may be * promoted if other vap's are operating with HT20/HT40. */

 * promoted if other vap's are operating with HT20/HT40.
 */
void
ieee80211_setupcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
{
	if (ic->ic_htcaps & IEEE80211_HTC_HT) {
		int flags = gethtadjustflags(ic);
		/*
		 * Check for channel promotion required to support the
		 * set of running vap's.  This assumes we are called
		 * after ni_chan is setup for each vap.
		 */
		/* XXX VHT? */
		/* NB: this assumes IEEE80211_FHT_USEHT40 > IEEE80211_FHT_HT */
		if (flags > ieee80211_htchanflags(c))
			c = ieee80211_ht_adjust_channel(ic, c, flags);
	}

	/*
	 * VHT promotion - this will at least promote to VHT20/40
	 * based on what HT has done; it may further promote the
	 * channel to VHT80 or above.
	 */
	if (ic->ic_vhtcaps != 0) {
		int flags = getvhtadjustflags(ic);
		if (flags > ieee80211_vhtchanflags(c))
			c = ieee80211_vht_adjust_channel(ic, c, flags);
	}

	ic->ic_bsschan = ic->ic_curchan = c;
	ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
	ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
}

/*
 * Change the current channel.  The channel change is guaranteed to have