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	diff --git a/sys/dev/iwn/if_iwn.c b/sys/dev/iwn/if_iwn.c
	--- a/sys/dev/iwn/if_iwn.c
	+++ b/sys/dev/iwn/if_iwn.c
	@@ -2812,23 +2812,18 @@
	*/
	plcp = IEEE80211_RV(rate) \| IWN_RFLAG_MCS;

	- /*
	- * XXX the following should only occur if both
	- * the local configuration _and_ the remote node
	- * advertise these capabilities. Thus this code
	- * may need fixing!
	- */
	-
	/*
	* Set the channel width and guard interval.
	+ *
	+ * Take into account the local configuration and
	+ * the node/peer advertised abilities.
	*/
	if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
	plcp \|= IWN_RFLAG_HT40;
	- if (ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40)
	+ if (ieee80211_ht_check_tx_shortgi_40(ni))
	plcp \|= IWN_RFLAG_SGI;
	- } else if (ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) {
	+ } else if (ieee80211_ht_check_tx_shortgi_20(ni))
	plcp \|= IWN_RFLAG_SGI;
	- }

	/*
	* Ensure the selected rate matches the link quality