P2P: Support driver preferred freq list for Autonomous GO case

When starting an autonomous GO without specifying the operating channel,
query the driver for the preferred frequency list, and use it to select
the operating channel of the GO (if supported).

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

wpa_supplicant/p2p_supplicant.c

@@ -5322,6 +5322,38 @@ static int wpas_p2p_select_go_freq(struct wpa_supplicant *wpa_s, int freq)
 {
 	unsigned int r;
 
+	if (!wpa_s->conf->num_p2p_pref_chan && !freq) {
+		unsigned int i, size = P2P_MAX_PREF_CHANNELS;
+		unsigned int pref_freq_list[P2P_MAX_PREF_CHANNELS];
+		int res;
+
+		res = wpa_drv_get_pref_freq_list(wpa_s, WPA_IF_P2P_GO,
+						 &size, pref_freq_list);
+		if (!res && size > 0) {
+			i = 0;
+			while (wpas_p2p_disallowed_freq(wpa_s->global,
+							pref_freq_list[i]) &&
+			       i < size) {
+				wpa_printf(MSG_DEBUG,
+					   "P2P: preferred_freq_list[%d]=%d is disallowed",
+					   i, pref_freq_list[i]);
+				i++;
+			}
+			if (i != size) {
+				freq = pref_freq_list[i];
+				wpa_printf(MSG_DEBUG,
+					   "P2P: Using preferred_freq_list[%d]=%d",
+					   i, freq);
+			} else {
+				wpa_printf(MSG_DEBUG,
+					   "P2P: All driver preferred frequencies are disallowed for P2P use");
+			}
+		} else {
+			wpa_printf(MSG_DEBUG,
+				   "P2P: No preferred frequency list available");
+		}
+	}
+
 	if (freq == 2) {
 		wpa_printf(MSG_DEBUG, "P2P: Request to start GO on 2.4 GHz "
 			   "band");