mac80211: explain padding in place of rate field

Apparently this was confusing still ... add a
note that the byte is needed as padding.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 54858a68abd7..1f06b31e21c1 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -143,7 +143,8 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
         if (status->flag & RX_FLAG_HT) {
                 /*
                  * MCS information is a separate field in radiotap,
-                 * added below.
+                 * added below. The byte here is needed as padding
+                 * for the channel though, so initialise it to 0.
                  */
                 *pos = 0;
         } else {