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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>
This commit is contained in:
Helmut Schaa 2012-12-05 14:36:12 +01:00 committed by Johannes Berg
parent ab9d6e4ffe
commit 751413eadc
1 changed files with 3 additions and 3 deletions
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6
net/mac80211/rx.c
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@ -378,9 +378,6 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
* 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 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
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;