Check for driver's DFS offload capability before handling DFS

This fixes couple of code paths where the WPA_DRIVER_FLAGS_DFS_OFFLOAD
flag was not checked properly and unexpected DFS operations were
initiated (and failed) in case the driver handles all these steps.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/ap/beacon.c

@@ -113,6 +113,10 @@ static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
 	    hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
 		return eid;
 
+	/* Let host drivers add this IE if DFS support is offloaded */
+	if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
+		return eid;
+
 	/*
 	 * There is no DFS support and power constraint was not directly
 	 * requested by config option.

src/ap/hostapd.c

@@ -1182,12 +1182,15 @@ int hostapd_setup_interface_complete(struct hostapd_iface *iface, int err)
 			   iface->conf->channel, iface->freq);
 
 #ifdef NEED_AP_MLME
-		/* Check DFS */
-		res = hostapd_handle_dfs(iface);
-		if (res <= 0) {
-			if (res < 0)
-				goto fail;
-			return res;
+		/* Handle DFS only if it is not offloaded to the driver */
+		if (!(iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)) {
+			/* Check DFS */
+			res = hostapd_handle_dfs(iface);
+			if (res <= 0) {
+				if (res < 0)
+					goto fail;
+				return res;
+			}
 		}
 #endif /* NEED_AP_MLME */