From 05511ea5881a4fcc80d6123ce27e83f76e0412ca Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 14 Jan 2016 01:42:17 +0100
Subject: [PATCH] mt76: remove skb_cow() to avoid unnecessary reallocations

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
 util.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/util.c b/util.c
index 01fc5ab0..16d299b9 100644
--- a/util.c
+++ b/util.c
@@ -30,8 +30,8 @@ int mt76_insert_hdr_pad(struct sk_buff *skb)
 	if (len % 4 == 0)
 		return 0;
 
-	ret = skb_cow(skb, 2);
-	if (ret)
+	if (skb_headroom(skb) < 2 &&
+	    (ret = pskb_expand_head(skb, 2, 0, GFP_ATOMIC)) != 0)
 		return ret;
 
 	skb_push(skb, 2);