1 files changed, 27 insertions, 0 deletions

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index d1f7abddb182..e00ce8c3e28e 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -3,6 +3,7 @@
  */
 
 #include <linux/nl80211.h>
+#include <net/cfg80211.h>
 #include "ieee80211_i.h"
 
 static enum ieee80211_chan_mode
@@ -134,3 +135,29 @@ bool ieee80211_set_channel_type(struct ieee80211_local *local,
 
         return result;
 }
+
+/*
+ * ieee80211_get_tx_channel_type returns the channel type we should
+ * use for packet transmission, given the channel capability and
+ * whatever regulatory flags we have been given.
+ */
+enum nl80211_channel_type ieee80211_get_tx_channel_type(
+                                struct ieee80211_local *local,
+                                enum nl80211_channel_type channel_type)
+{
+        switch (channel_type) {
+        case NL80211_CHAN_HT40PLUS:
+                if (local->hw.conf.channel->flags &
+                                IEEE80211_CHAN_NO_HT40PLUS)
+                        return NL80211_CHAN_HT20;
+                break;
+        case NL80211_CHAN_HT40MINUS:
+                if (local->hw.conf.channel->flags &
+                                IEEE80211_CHAN_NO_HT40MINUS)
+                        return NL80211_CHAN_HT20;
+                break;
+        default:
+                break;
+        }
+        return channel_type;
+}