openwrt/package/network/services/hostapd/patches/470-survey_data_fallback.patch

--- a/src/ap/acs.c
+++ b/src/ap/acs.c
@@ -420,20 +420,19 @@ static int acs_usable_bw160_chan(const s
 static int acs_survey_is_sufficient(struct freq_survey *survey)
 {
 	if (!(survey->filled & SURVEY_HAS_NF)) {
+		survey->nf = -95;
 		wpa_printf(MSG_INFO, "ACS: Survey is missing noise floor");
-		return 0;
 	}
 
 	if (!(survey->filled & SURVEY_HAS_CHAN_TIME)) {
+		survey->channel_time = 0;
 		wpa_printf(MSG_INFO, "ACS: Survey is missing channel time");
-		return 0;
 	}
 
 	if (!(survey->filled & SURVEY_HAS_CHAN_TIME_BUSY) &&
 	    !(survey->filled & SURVEY_HAS_CHAN_TIME_RX)) {
 		wpa_printf(MSG_INFO,
 			   "ACS: Survey is missing RX and busy time (at least one is required)");
-		return 0;
 	}
 
 	return 1;