netdev - [PATCH] gianfar: only check headroom when FCB is needed

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Message-Id: <1238140890-26058-1-git-send-email-leoli@freescale.com>
Date:	Fri, 27 Mar 2009 16:01:30 +0800
From:	Li Yang <leoli@...escale.com>
To:	davem@...emloft.net
Cc:	shemminger@...tta.com, netdev@...r.kernel.org,
	Li Yang <leoli@...escale.com>
Subject: [PATCH] gianfar: only check headroom when FCB is needed

Signed-off-by: Li Yang <leoli@...escale.com>
---
 drivers/net/gianfar.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 14f9b5e..6e28088 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -1277,8 +1277,10 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	base = priv->tx_bd_base;
 
-	/* make space for additional header */
-	if (skb_headroom(skb) < GMAC_FCB_LEN) {
+	/* make space for additional header when fcb is needed */
+	if (((skb->ip_summed == CHECKSUM_PARTIAL) ||
+			(priv->vlgrp && vlan_tx_tag_present(skb))) &&
+			(skb_headroom(skb) < GMAC_FCB_LEN)) {
 		struct sk_buff *skb_new;
 
 		skb_new = skb_realloc_headroom(skb, GMAC_FCB_LEN);
-- 
1.5.4

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