3 files changed, 73 insertions, 14 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 7285bdc4e59..85b5aa3c76f 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3491,6 +3491,60 @@ void nl80211_michael_mic_failure(struct cfg80211_registered_device *rdev,
 	nlmsg_free(msg);
 }
 
+void nl80211_send_beacon_hint_event(struct wiphy *wiphy,
+				    struct ieee80211_channel *channel_before,
+				    struct ieee80211_channel *channel_after)
+{
+	struct sk_buff *msg;
+	void *hdr;
+	struct nlattr *nl_freq;
+
+	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+	if (!msg)
+		return;
+
+	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_REG_BEACON_HINT);
+	if (!hdr) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	/*
+	 * Since we are applying the beacon hint to a wiphy we know its
+	 * wiphy_idx is valid
+	 */
+	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, get_wiphy_idx(wiphy));
+
+	/* Before */
+	nl_freq = nla_nest_start(msg, NL80211_ATTR_FREQ_BEFORE);
+	if (!nl_freq)
+		goto nla_put_failure;
+	if (nl80211_msg_put_channel(msg, channel_before))
+		goto nla_put_failure;
+	nla_nest_end(msg, nl_freq);
+
+	/* After */
+	nl_freq = nla_nest_start(msg, NL80211_ATTR_FREQ_AFTER);
+	if (!nl_freq)
+		goto nla_put_failure;
+	if (nl80211_msg_put_channel(msg, channel_after))
+		goto nla_put_failure;
+	nla_nest_end(msg, nl_freq);
+
+	if (genlmsg_end(msg, hdr) < 0) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast(msg, 0, nl80211_regulatory_mcgrp.id, GFP_ATOMIC);
+
+	return;
+
+nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
+}
+
 /* initialisation/exit functions */
 
 int nl80211_init(void)
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index e4b92cccd15..b3aaa59afa0 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -29,4 +29,9 @@ nl80211_michael_mic_failure(struct cfg80211_registered_device *rdev,
 			    enum nl80211_key_type key_type,
 			    int key_id, const u8 *tsc);
 
+extern void
+nl80211_send_beacon_hint_event(struct wiphy *wiphy,
+			       struct ieee80211_channel *channel_before,
+			       struct ieee80211_channel *channel_after);
+
 #endif /* __NET_WIRELESS_NL80211_H */
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 4af4304cec3..574e217bcc8 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1049,18 +1049,10 @@ static void handle_reg_beacon(struct wiphy *wiphy,
 			      unsigned int chan_idx,
 			      struct reg_beacon *reg_beacon)
 {
-#ifdef CONFIG_CFG80211_REG_DEBUG
-#define REG_DEBUG_BEACON_FLAG(desc) \
-	printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
-		"frequency: %d MHz (Ch %d) on %s\n", \
-		reg_beacon->chan.center_freq, \
-		ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
-		wiphy_name(wiphy));
-#else
-#define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
-#endif
 	struct ieee80211_supported_band *sband;
 	struct ieee80211_channel *chan;
+	bool channel_changed = false;
+	struct ieee80211_channel chan_before;
 
 	assert_cfg80211_lock();
 
@@ -1070,20 +1062,28 @@ static void handle_reg_beacon(struct wiphy *wiphy,
 	if (likely(chan->center_freq != reg_beacon->chan.center_freq))
 		return;
 
+	if (chan->beacon_found)
+		return;
+
+	chan->beacon_found = true;
+
+	chan_before.center_freq = chan->center_freq;
+	chan_before.flags = chan->flags;
+
 	if ((chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) &&
 	    !(chan->orig_flags & IEEE80211_CHAN_PASSIVE_SCAN)) {
 		chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
-		REG_DEBUG_BEACON_FLAG("active scanning");
+		channel_changed = true;
 	}
 
 	if ((chan->flags & IEEE80211_CHAN_NO_IBSS) &&
 	    !(chan->orig_flags & IEEE80211_CHAN_NO_IBSS)) {
 		chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
-		REG_DEBUG_BEACON_FLAG("beaconing");
+		channel_changed = true;
 	}
 
-	chan->beacon_found = true;
-#undef REG_DEBUG_BEACON_FLAG
+	if (channel_changed)
+		nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
 }
 
 /*