From 4cd06a344db752f513437138953af191cbe9a691 Mon Sep 17 00:00:00 2001 From: Felix Fietkau 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 Signed-off-by: John W. Linville --- 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, -- 2.30.2