mac80211: skip radiotap space calculation if no monitor exists
The radiotap header length "needed_headroom" is only required if we're
sending the skb to a monitor interface. Hence, move the calculation a
bit later so the calculation can be skipped if no monitor interface is
present.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index db343fa..e4ee327 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -378,9 +378,6 @@
* the SKB because it has a bad FCS/PLCP checksum.
*/
- /* room for the radiotap header based on driver features */
- needed_headroom = ieee80211_rx_radiotap_space(local, status);
-
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
present_fcs_len = FCS_LEN;
@@ -399,6 +396,9 @@
return remove_monitor_info(local, origskb);
}
+ /* room for the radiotap header based on driver features */
+ needed_headroom = ieee80211_rx_radiotap_space(local, status);
+
if (should_drop_frame(origskb, present_fcs_len)) {
/* only need to expand headroom if necessary */
skb = origskb;