Define helper function set_disable_ht40()

This functionality can be used outside wpa_set_disable_ht40(), so move
the generic part to a helper function.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

src/common/hw_features_common.c

@@ -453,3 +453,17 @@ int hostapd_set_freq_params(struct hostapd_freq_params *data,
 
 	return 0;
 }
+
+
+void set_disable_ht40(struct ieee80211_ht_capabilities *htcaps,
+		      int disabled)
+{
+	/* Masking these out disables HT40 */
+	le16 msk = host_to_le16(HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET |
+				HT_CAP_INFO_SHORT_GI40MHZ);
+
+	if (disabled)
+		htcaps->ht_capabilities_info &= ~msk;
+	else
+		htcaps->ht_capabilities_info |= msk;
+}

src/common/hw_features_common.h

@@ -35,5 +35,7 @@ int hostapd_set_freq_params(struct hostapd_freq_params *data,
 			    int vht_enabled, int sec_channel_offset,
 			    int vht_oper_chwidth, int center_segment0,
 			    int center_segment1, u32 vht_caps);
+void set_disable_ht40(struct ieee80211_ht_capabilities *htcaps,
+		      int disabled);
 
 #endif /* HW_FEATURES_COMMON_H */

wpa_supplicant/wpa_supplicant.c

@@ -3873,18 +3873,10 @@ static int wpa_set_disable_ht40(struct wpa_supplicant *wpa_s,
 				struct ieee80211_ht_capabilities *htcaps_mask,
 				int disabled)
 {
-	/* Masking these out disables HT40 */
-	le16 msk = host_to_le16(HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET |
-				HT_CAP_INFO_SHORT_GI40MHZ);
-
 	wpa_msg(wpa_s, MSG_DEBUG, "set_disable_ht40: %d", disabled);
 
-	if (disabled)
-		htcaps->ht_capabilities_info &= ~msk;
-	else
-		htcaps->ht_capabilities_info |= msk;
-
-	htcaps_mask->ht_capabilities_info |= msk;
+	set_disable_ht40(htcaps, disabled);
+	set_disable_ht40(htcaps_mask, 0);
 
 	return 0;
 }