mac80211: radiotap: assume modulation from rates

use the rates ERP flag to derive CCK or OFDM modulation for the radiotap
header.

(it might be more correct to get this information from the hardware itself, but it
seems safe to assume this in most practical cases.)

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index ad47a614a202..60e9ea11115f 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -157,8 +157,11 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
         if (status->band == IEEE80211_BAND_5GHZ)
                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
                                              IEEE80211_CHAN_5GHZ);
+        else if (rate->flags & IEEE80211_RATE_ERP_G)
+                *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
+                                             IEEE80211_CHAN_2GHZ);
         else
-                *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
+                *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
                                              IEEE80211_CHAN_2GHZ);
         pos += 2;