From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 23 Feb 2013 18:02:14 +0000 (+0100)
Subject: mac80211: fix monitor mode channel reporting
X-Git-Tag: firefly_0821_release~3680^2~921^2~28^2^2~10
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cb601ffa326bc5c74a6ecd8e72ae9631e5f12f75;p=firefly-linux-kernel-4.4.55.git

mac80211: fix monitor mode channel reporting

When not using channel contexts with only monitor mode interfaces being
active, report local->monitor_chandef to userspace.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 09d96a8f6c2c..808f5fcd1ced 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3285,13 +3285,19 @@ static int ieee80211_cfg_get_channel(struct wiphy *wiphy,
 				     struct cfg80211_chan_def *chandef)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
+	struct ieee80211_local *local = wiphy_priv(wiphy);
 	struct ieee80211_chanctx_conf *chanctx_conf;
 	int ret = -ENODATA;
 
 	rcu_read_lock();
-	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
-	if (chanctx_conf) {
-		*chandef = chanctx_conf->def;
+	if (local->use_chanctx) {
+		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+		if (chanctx_conf) {
+			*chandef = chanctx_conf->def;
+			ret = 0;
+		}
+	} else if (local->open_count == local->monitors) {
+		*chandef = local->monitor_chandef;
 		ret = 0;
 	}
 	rcu_read_unlock();