[PATCH v2] mac80211: exit cooked monitor RX early if there are none

[Johannes Berg <johannes@sipsolutions.net>]

From: Johannes Berg <johannes.berg@intel.com>

If there are no cooked monitor interfaces, there's
no point in building the radiotap RX header for the
frame and iterating the interface list.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
v2: wow, embarrassing ... try quilt refresh ...

 net/mac80211/rx.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/mac80211/rx.c	2011-10-21 10:19:33.000000000 +0200
+++ b/net/mac80211/rx.c	2011-10-21 10:20:59.000000000 +0200
@@ -2489,6 +2489,10 @@ static void ieee80211_rx_cooked_monitor(
 		goto out_free_skb;
 	rx->flags |= IEEE80211_RX_CMNTR;
 
+	/* If there are no cooked monitor interfaces, just free the SKB */
+	if (!local->cooked_mntrs)
+		goto out_free_skb;
+
 	if (skb_headroom(skb) < sizeof(*rthdr) &&
 	    pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
 		goto out_free_skb;