From 4cd06a344db752f513437138953af191cbe9a691 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 18 Dec 2010 19:30:49 +0100
Subject: [PATCH] mac80211: skip unnecessary pskb_expand_head calls
If the skb is not cloned and we don't need any extra headroom, there
is no point in reallocating the skb head.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
net/mac80211/tx.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 8d01d21dff1e..90ee23550033 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1546,8 +1546,10 @@ static int ieee80211_skb_resize(struct ieee80211_local *local,
if (skb_header_cloned(skb))
I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
- else
+ else if (head_need || tail_need)
I802_DEBUG_INC(local->tx_expand_skb_head);
+ else
+ return 0;
if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
wiphy_debug(local->hw.wiphy,