diff --git a/src/ap/acs.c b/src/ap/acs.c
index d5e3f59..8536e48 100644
--- a/src/ap/acs.c
+++ b/src/ap/acs.c
@@ -352,16 +352,6 @@
 }
 
 
-static int acs_usable_chan(struct hostapd_channel_data *chan)
-{
-	if (dl_list_empty(&chan->survey_list))
-		return 0;
-	if (chan->flag & HOSTAPD_CHAN_DISABLED)
-		return 0;
-	return 1;
-}
-
-
 static int acs_usable_ht40_chan(struct hostapd_channel_data *chan)
 {
 	const int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149,
@@ -398,28 +388,54 @@
 }
 
 
+static int acs_survey_list_is_sufficient(struct hostapd_channel_data *chan)
+{
+	struct freq_survey *survey;
+
+	dl_list_for_each(survey, &chan->survey_list, struct freq_survey, list)
+	{
+		if (!acs_survey_is_sufficient(survey)) {
+			wpa_printf(MSG_ERROR, "ACS: Channel %d has insufficient survey data",
+				   chan->chan);
+			return 0;
+		}
+	}
+
+	return 1;
+
+}
+
+
 static int acs_surveys_are_sufficient(struct hostapd_iface *iface)
 {
 	int i;
 	struct hostapd_channel_data *chan;
-	struct freq_survey *survey;
+	int valid = 0;
 
 	for (i = 0; i < iface->current_mode->num_channels; i++) {
 		chan = &iface->current_mode->channels[i];
 		if (chan->flag & HOSTAPD_CHAN_DISABLED)
 			continue;
 
-		dl_list_for_each(survey, &chan->survey_list,
-				 struct freq_survey, list)
-		{
-			if (!acs_survey_is_sufficient(survey)) {
-				wpa_printf(MSG_ERROR, "ACS: Channel %d has insufficient survey data",
-					   chan->chan);
-				return 0;
-			}
-		}
+		if (!acs_survey_list_is_sufficient(chan))
+			continue;
+
+		valid++;
 	}
 
+	/* We need at least survey data for one channel */
+	return !!valid;
+}
+
+
+static int acs_usable_chan(struct hostapd_channel_data *chan)
+{
+	if (dl_list_empty(&chan->survey_list))
+		return 0;
+	if (chan->flag & HOSTAPD_CHAN_DISABLED)
+		return 0;
+	if (!acs_survey_list_is_sufficient(chan))
+		return 0;
 	return 1;
 }
 
@@ -456,7 +472,7 @@
 	for (i = 0; i < iface->current_mode->num_channels; i++) {
 		chan = &iface->current_mode->channels[i];
 
-		if (!acs_usable_chan(chan))
+		if (chan->flag & HOSTAPD_CHAN_DISABLED)
 			continue;
 
 		if (chan->freq == freq)
@@ -476,7 +492,8 @@
 static struct hostapd_channel_data *
 acs_find_ideal_chan(struct hostapd_iface *iface)
 {
-	struct hostapd_channel_data *chan, *adj_chan, *ideal_chan = NULL;
+	struct hostapd_channel_data *chan, *adj_chan, *ideal_chan = NULL,
+		*rand_chan = NULL;
 	long double factor, ideal_factor = 0;
 	int i, j;
 	int n_chans = 1;
@@ -508,9 +525,10 @@
 	for (i = 0; i < iface->current_mode->num_channels; i++) {
 		chan = &iface->current_mode->channels[i];
 
-		if (!acs_usable_chan(chan))
+		if (chan->flag & HOSTAPD_CHAN_DISABLED)
 			continue;
 
+
 		/* HT40 on 5 GHz has a limited set of primary channels as per
 		 * 11n Annex J */
 		if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A &&
@@ -522,14 +540,17 @@
 			continue;
 		}
 
-		factor = chan->interference_factor;
+		factor = 0;
+		if (acs_usable_chan(chan))
+			factor = chan->interference_factor;
 
 		for (j = 1; j < n_chans; j++) {
 			adj_chan = acs_find_chan(iface, chan->freq + (j * 20));
 			if (!adj_chan)
 				break;
 
-			factor += adj_chan->interference_factor;
+			if (acs_usable_chan(adj_chan))
+				factor += adj_chan->interference_factor;
 		}
 
 		if (j != n_chans) {
@@ -548,22 +569,22 @@
 
 				adj_chan = acs_find_chan(iface, chan->freq +
 							 (j * 20) - 5);
-				if (adj_chan)
+				if (adj_chan && acs_usable_chan(adj_chan))
 					factor += adj_chan->interference_factor;
 
 				adj_chan = acs_find_chan(iface, chan->freq +
 							 (j * 20) - 10);
-				if (adj_chan)
+				if (adj_chan && acs_usable_chan(adj_chan))
 					factor += adj_chan->interference_factor;
 
 				adj_chan = acs_find_chan(iface, chan->freq +
 							 (j * 20) + 5);
-				if (adj_chan)
+				if (adj_chan && acs_usable_chan(adj_chan))
 					factor += adj_chan->interference_factor;
 
 				adj_chan = acs_find_chan(iface, chan->freq +
 							 (j * 20) + 10);
-				if (adj_chan)
+				if (adj_chan && acs_usable_chan(adj_chan))
 					factor += adj_chan->interference_factor;
 			}
 		}
@@ -571,17 +592,24 @@
 		wpa_printf(MSG_DEBUG, "ACS:  * channel %d: total interference = %Lg",
 			   chan->chan, factor);
 
-		if (!ideal_chan || factor < ideal_factor) {
+		if (acs_usable_chan(chan) &&
+		    (!ideal_chan || factor < ideal_factor)) {
 			ideal_factor = factor;
 			ideal_chan = chan;
 		}
+
+		/* This channel would at least be usable */
+		if (!rand_chan)
+			rand_chan = chan;
 	}
 
-	if (ideal_chan)
+	if (ideal_chan) {
 		wpa_printf(MSG_DEBUG, "ACS: Ideal channel is %d (%d MHz) with total interference factor of %Lg",
 			   ideal_chan->chan, ideal_chan->freq, ideal_factor);
+		return ideal_chan;
+	}
 
-	return ideal_chan;
+	return rand_chan;
 }
 
 
@@ -655,6 +683,7 @@
 	ideal_chan = acs_find_ideal_chan(iface);
 	if (!ideal_chan) {
 		wpa_printf(MSG_ERROR, "ACS: Failed to compute ideal channel");
+		err = -1;
 		goto fail;
 	}
 
@@ -663,24 +692,20 @@
 	if (iface->conf->ieee80211ac)
 		acs_adjust_vht_center_freq(iface);
 
+	err = 0;
+fail:
 	/*
 	 * hostapd_setup_interface_complete() will return -1 on failure,
 	 * 0 on success and 0 is HOSTAPD_CHAN_VALID :)
 	 */
-	switch (hostapd_acs_completed(iface)) {
-	case HOSTAPD_CHAN_VALID:
+	if (hostapd_acs_completed(iface, err) == HOSTAPD_CHAN_VALID) {
 		acs_cleanup(iface);
 		return;
-	case HOSTAPD_CHAN_INVALID:
-	case HOSTAPD_CHAN_ACS:
-	default:
-		/* This can possibly happen if channel parameters (secondary
-		 * channel, center frequencies) are misconfigured */
-		wpa_printf(MSG_ERROR, "ACS: Possibly channel configuration is invalid, please report this along with your config file.");
-		goto fail;
 	}
 
-fail:
+	/* This can possibly happen if channel parameters (secondary
+	 * channel, center frequencies) are misconfigured */
+	wpa_printf(MSG_ERROR, "ACS: Possibly channel configuration is invalid, please report this along with your config file.");
 	acs_fail(iface);
 }
 
diff --git a/src/ap/acs.h b/src/ap/acs.h
index 0d1d0f1..a41f17f 100644
--- a/src/ap/acs.h
+++ b/src/ap/acs.h
@@ -13,7 +13,7 @@
 #ifdef CONFIG_ACS
 
 enum hostapd_chan_status acs_init(struct hostapd_iface *iface);
-int hostapd_acs_completed(struct hostapd_iface *iface);
+int hostapd_acs_completed(struct hostapd_iface *iface, int err);
 
 #else /* CONFIG_ACS */
 
diff --git a/src/ap/hw_features.c b/src/ap/hw_features.c
index 9e5becc..609ed53 100644
--- a/src/ap/hw_features.c
+++ b/src/ap/hw_features.c
@@ -758,9 +758,12 @@
 }
 
 
-int hostapd_acs_completed(struct hostapd_iface *iface)
+int hostapd_acs_completed(struct hostapd_iface *iface, int err)
 {
-	int ret;
+	int ret = -1;
+
+	if (err)
+		goto out;
 
 	switch (hostapd_check_chans(iface)) {
 	case HOSTAPD_CHAN_VALID:
@@ -768,23 +771,25 @@
 	case HOSTAPD_CHAN_ACS:
 		wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
 		hostapd_notify_bad_chans(iface);
-		return -1;
+		goto out;
 	case HOSTAPD_CHAN_INVALID:
 	default:
 		wpa_printf(MSG_ERROR, "ACS picked unusable channels");
 		hostapd_notify_bad_chans(iface);
-		return -1;
+		goto out;
 	}
 
 	ret = hostapd_check_ht_capab(iface);
 	if (ret < 0)
-		return -1;
+		goto out;
 	if (ret == 1) {
 		wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
 		return 0;
 	}
 
-	return hostapd_setup_interface_complete(iface, 0);
+	ret = 0;
+out:
+	return hostapd_setup_interface_complete(iface, ret);
 }
 
 
diff --git a/src/eap_peer/eap_proxy.h b/src/eap_peer/eap_proxy.h
index 3b4dcef..23cdbe6 100644
--- a/src/eap_peer/eap_proxy.h
+++ b/src/eap_peer/eap_proxy.h
@@ -40,7 +40,8 @@
 int eap_proxy_sm_get_status(struct eap_proxy_sm *sm, char *buf, size_t buflen,
 			    int verbose);
 
-int eap_proxy_get_imsi(char *imsi_buf, size_t *imsi_len);
+int eap_proxy_get_imsi(struct eap_proxy_sm *eap_proxy, char *imsi_buf,
+		       size_t *imsi_len);
 
 int eap_proxy_notify_config(struct eap_proxy_sm *sm,
 			    struct eap_peer_config *config);
diff --git a/src/eap_peer/eap_proxy_dummy.c b/src/eap_peer/eap_proxy_dummy.c
index cd97fb6..d84f012 100644
--- a/src/eap_peer/eap_proxy_dummy.c
+++ b/src/eap_peer/eap_proxy_dummy.c
@@ -63,7 +63,8 @@
 }
 
 
-int eap_proxy_get_imsi(char *imsi_buf, size_t *imsi_len)
+int eap_proxy_get_imsi(struct eap_proxy_sm *eap_proxy, char *imsi_buf,
+		       size_t *imsi_len)
 {
 	return -1;
 }
diff --git a/src/eapol_supp/eapol_supp_sm.c b/src/eapol_supp/eapol_supp_sm.c
index 03ec2cb..9d7aef0 100644
--- a/src/eapol_supp/eapol_supp_sm.c
+++ b/src/eapol_supp/eapol_supp_sm.c
@@ -2051,3 +2051,15 @@
 		return 0;
 	return !sm->eapSuccess && sm->eapFail;
 }
+
+
+int eapol_sm_get_eap_proxy_imsi(struct eapol_sm *sm, char *imsi, size_t *len)
+{
+#ifdef CONFIG_EAP_PROXY
+	if (sm->eap_proxy == NULL)
+		return -1;
+	return eap_proxy_get_imsi(sm->eap_proxy, imsi, len);
+#else /* CONFIG_EAP_PROXY */
+	return -1;
+#endif /* CONFIG_EAP_PROXY */
+}
diff --git a/src/eapol_supp/eapol_supp_sm.h b/src/eapol_supp/eapol_supp_sm.h
index 6faf816..54e8a27 100644
--- a/src/eapol_supp/eapol_supp_sm.h
+++ b/src/eapol_supp/eapol_supp_sm.h
@@ -292,6 +292,7 @@
 void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
 			     struct ext_password_data *ext);
 int eapol_sm_failed(struct eapol_sm *sm);
+int eapol_sm_get_eap_proxy_imsi(struct eapol_sm *sm, char *imsi, size_t *len);
 #else /* IEEE8021X_EAPOL */
 static inline struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx)
 {
diff --git a/src/p2p/p2p_go_neg.c b/src/p2p/p2p_go_neg.c
index bd583be..eea946f 100644
--- a/src/p2p/p2p_go_neg.c
+++ b/src/p2p/p2p_go_neg.c
@@ -471,9 +471,11 @@
 				 u8 *status)
 {
 	struct p2p_channels intersection;
-	size_t i;
 
+	p2p_channels_dump(p2p, "own channels", &p2p->channels);
+	p2p_channels_dump(p2p, "peer channels", &dev->channels);
 	p2p_channels_intersect(&p2p->channels, &dev->channels, &intersection);
+	p2p_channels_dump(p2p, "intersection", &intersection);
 	if (intersection.reg_classes == 0 ||
 	    intersection.reg_class[0].channels == 0) {
 		*status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
@@ -481,14 +483,6 @@
 		return -1;
 	}
 
-	for (i = 0; i < intersection.reg_classes; i++) {
-		struct p2p_reg_class *c;
-		c = &intersection.reg_class[i];
-		p2p_dbg(p2p, "reg_class %u", c->reg_class);
-		wpa_hexdump(MSG_DEBUG, "P2P: channels",
-			    c->channel, c->channels);
-	}
-
 	if (!p2p_channels_includes(&intersection, p2p->op_reg_class,
 				   p2p->op_channel)) {
 		if (dev->flags & P2P_DEV_FORCE_FREQ) {
diff --git a/src/p2p/p2p_i.h b/src/p2p/p2p_i.h
index f323ef7..f9b1e68 100644
--- a/src/p2p/p2p_i.h
+++ b/src/p2p/p2p_i.h
@@ -580,6 +580,8 @@
 			    struct p2p_channels *res);
 int p2p_channels_includes(const struct p2p_channels *channels, u8 reg_class,
 			  u8 channel);
+void p2p_channels_dump(struct p2p_data *p2p, const char *title,
+		       const struct p2p_channels *chan);
 #ifdef ANDROID_P2P
 size_t p2p_copy_reg_class(struct p2p_reg_class *dc, struct p2p_reg_class *sc);
 #endif
diff --git a/src/p2p/p2p_utils.c b/src/p2p/p2p_utils.c
index a4c48f6..8c2d2de 100644
--- a/src/p2p/p2p_utils.c
+++ b/src/p2p/p2p_utils.c
@@ -310,3 +310,36 @@
 
 	return 0;
 }
+
+
+void p2p_channels_dump(struct p2p_data *p2p, const char *title,
+		       const struct p2p_channels *chan)
+{
+	char buf[500], *pos, *end;
+	size_t i, j;
+	int ret;
+
+	pos = buf;
+	end = pos + sizeof(buf);
+
+	for (i = 0; i < chan->reg_classes; i++) {
+		const struct p2p_reg_class *c;
+		c = &chan->reg_class[i];
+		ret = os_snprintf(pos, end - pos, " %u:", c->reg_class);
+		if (ret < 0 || ret >= end - pos)
+			break;
+		pos += ret;
+
+		for (j = 0; j < c->channels; j++) {
+			ret = os_snprintf(pos, end - pos, "%s%u",
+					  j == 0 ? "" : ",",
+					  c->channel[j]);
+			if (ret < 0 || ret >= end - pos)
+				break;
+			pos += ret;
+		}
+	}
+	*pos = '\0';
+
+	p2p_dbg(p2p, "%s:%s", title, buf);
+}
diff --git a/src/utils/common.c b/src/utils/common.c
index 207d477..5734de7 100644
--- a/src/utils/common.c
+++ b/src/utils/common.c
@@ -624,3 +624,99 @@
 
 	return res;
 }
+
+
+int freq_range_list_parse(struct wpa_freq_range_list *res, const char *value)
+{
+	struct wpa_freq_range *freq = NULL, *n;
+	unsigned int count = 0;
+	const char *pos, *pos2, *pos3;
+
+	/*
+	 * Comma separated list of frequency ranges.
+	 * For example: 2412-2432,2462,5000-6000
+	 */
+	pos = value;
+	while (pos && pos[0]) {
+		n = os_realloc_array(freq, count + 1,
+				     sizeof(struct wpa_freq_range));
+		if (n == NULL) {
+			os_free(freq);
+			return -1;
+		}
+		freq = n;
+		freq[count].min = atoi(pos);
+		pos2 = os_strchr(pos, '-');
+		pos3 = os_strchr(pos, ',');
+		if (pos2 && (!pos3 || pos2 < pos3)) {
+			pos2++;
+			freq[count].max = atoi(pos2);
+		} else
+			freq[count].max = freq[count].min;
+		pos = pos3;
+		if (pos)
+			pos++;
+		count++;
+	}
+
+	os_free(res->range);
+	res->range = freq;
+	res->num = count;
+
+	return 0;
+}
+
+
+int freq_range_list_includes(const struct wpa_freq_range_list *list,
+			     unsigned int freq)
+{
+	unsigned int i;
+
+	if (list == NULL)
+		return 0;
+
+	for (i = 0; i < list->num; i++) {
+		if (freq >= list->range[i].min && freq <= list->range[i].max)
+			return 1;
+	}
+
+	return 0;
+}
+
+
+char * freq_range_list_str(const struct wpa_freq_range_list *list)
+{
+	char *buf, *pos, *end;
+	size_t maxlen;
+	unsigned int i;
+	int res;
+
+	if (list->num == 0)
+		return NULL;
+
+	maxlen = list->num * 30;
+	buf = os_malloc(maxlen);
+	if (buf == NULL)
+		return NULL;
+	pos = buf;
+	end = buf + maxlen;
+
+	for (i = 0; i < list->num; i++) {
+		struct wpa_freq_range *range = &list->range[i];
+
+		if (range->min == range->max)
+			res = os_snprintf(pos, end - pos, "%s%u",
+					  i == 0 ? "" : ",", range->min);
+		else
+			res = os_snprintf(pos, end - pos, "%s%u-%u",
+					  i == 0 ? "" : ",",
+					  range->min, range->max);
+		if (res < 0 || res > end - pos) {
+			os_free(buf);
+			return NULL;
+		}
+		pos += res;
+	}
+
+	return buf;
+}
diff --git a/src/utils/common.h b/src/utils/common.h
index 29f0b95..399ab79 100644
--- a/src/utils/common.h
+++ b/src/utils/common.h
@@ -505,6 +505,20 @@
 #include "wpa_debug.h"
 
 
+struct wpa_freq_range_list {
+	struct wpa_freq_range {
+		unsigned int min;
+		unsigned int max;
+	} *range;
+	unsigned int num;
+};
+
+int freq_range_list_parse(struct wpa_freq_range_list *res, const char *value);
+int freq_range_list_includes(const struct wpa_freq_range_list *list,
+			     unsigned int freq);
+char * freq_range_list_str(const struct wpa_freq_range_list *list);
+
+
 /*
  * gcc 4.4 ends up generating strict-aliasing warnings about some very common
  * networking socket uses that do not really result in a real problem and