Use previously computed channel in cs_freq_params for Beacon frames

When CSA is started, hostapd_change_config_freq() computes the channel
from the provided frequency. Use this stored channel to add CSA IE in
Beacon frames, instead of recomputing the channel each time.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>

src/ap/beacon.c

@@ -297,19 +297,13 @@ static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 
 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 {
-	u8 chan;
-
-	if (!hapd->cs_freq_params.freq)
-		return eid;
-
-	if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
-	    NUM_HOSTAPD_MODES)
+	if (!hapd->cs_freq_params.channel)
 		return eid;
 
 	*eid++ = WLAN_EID_CHANNEL_SWITCH;
 	*eid++ = 3;
 	*eid++ = hapd->cs_block_tx;
-	*eid++ = chan;
+	*eid++ = hapd->cs_freq_params.channel;
 	*eid++ = hapd->cs_count;
 
 	return eid;