From 854f163bb026a472499278a83bb6a1860740c336 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 18 Dec 2010 19:30:50 +0100
Subject: [PATCH] mac80211: fix potentially redundant skb data copying
When an skb is shared, it needs to be duplicated, along with its data buffer.
If the skb does not have enough headroom, using skb_copy might cause the data
buffer to be copied twice (once by skb_copy and once by pskb_expand_head).
Fix this by using skb_clone initially and letting ieee80211_skb_resize sort
out the rest.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
net/mac80211/tx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 90ee235500332..d2b4b67a7b53d 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1934,7 +1934,7 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
*/
if (skb_shared(skb)) {
tmp_skb = skb;
- skb = skb_copy(skb, GFP_ATOMIC);
+ skb = skb_clone(skb, GFP_ATOMIC);
kfree_skb(tmp_skb);
if (!skb) {
--
2.39.5