openwrtv4/package/network/services/hostapd/patches/450-reload_freq_change.patch

--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -133,38 +133,51 @@ static void hostapd_clear_old(struct hos
 int hostapd_reload_config(struct hostapd_iface *iface)
 {
 	struct hostapd_data *hapd = iface->bss[0];
-	struct hostapd_config *newconf, *oldconf;
+	struct hostapd_config *conf = hapd->iconf, *oldconf = NULL;
 	size_t j;
 
-	if (iface->config_fname == NULL) {
-		/* Only in-memory config in use - assume it has been updated */
+	if (iface->config_fname) {
+		if (iface->interfaces == NULL ||
+			iface->interfaces->config_read_cb == NULL)
+			return -1;
+		conf = iface->interfaces->config_read_cb(iface->config_fname);
+		if (conf == NULL)
+			return -1;
+
 		hostapd_clear_old(iface);
-		for (j = 0; j < iface->num_bss; j++)
-			hostapd_reload_bss(iface->bss[j]);
-		return 0;
-	}
 
-	if (iface->interfaces == NULL ||
-	    iface->interfaces->config_read_cb == NULL)
-		return -1;
-	newconf = iface->interfaces->config_read_cb(iface->config_fname);
-	if (newconf == NULL)
-		return -1;
+		oldconf = hapd->iconf;
+		iface->conf = conf;
+	}
 
-	hostapd_clear_old(iface);
+	hostapd_select_hw_mode(iface);
+	iface->freq = hostapd_hw_get_freq(hapd, conf->channel);
 
-	oldconf = hapd->iconf;
-	iface->conf = newconf;
+	if (iface->current_mode)
+		hostapd_prepare_rates(iface, iface->current_mode);
 
 	for (j = 0; j < iface->num_bss; j++) {
 		hapd = iface->bss[j];
-		hapd->iconf = newconf;
-		hapd->conf = &newconf->bss[j];
+		hapd->iconf = iface->conf;
+		hapd->conf = &iface->conf->bss[j];
+
+		if (hostapd_set_freq(hapd, conf->hw_mode, iface->freq,
+					 conf->channel,
+					 conf->ieee80211n,
+					 conf->ieee80211ac,
+					 conf->secondary_channel,
+					 conf->vht_oper_chwidth,
+					 conf->vht_oper_centr_freq_seg0_idx,
+					 conf->vht_oper_centr_freq_seg1_idx)) {
+			wpa_printf(MSG_ERROR, "Could not set channel for "
+				   "kernel driver");
+		}
+
 		hostapd_reload_bss(hapd);
 	}
 
-	hostapd_config_free(oldconf);
-
+	if (oldconf)
+		hostapd_config_free(oldconf);
 
 	return 0;
 }
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -6466,7 +6466,7 @@ static int wpa_driver_nl80211_set_freq(s
 
 	nl80211_cmd(drv, msg, 0, NL80211_CMD_SET_WIPHY);
 
-	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, bss->ifindex);
 	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq->freq);
 	if (freq->vht_enabled) {
 		switch (freq->bandwidth) {