aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/znet.c
diff options
context:
space:
mode:
authorHerbert Xu <herbert@gondor.apana.org.au>2006-06-23 05:06:41 -0400
committerDavid S. Miller <davem@davemloft.net>2006-06-23 05:06:41 -0400
commit5b057c6b1a25d57edf2b4d1e956e50936480a9ff (patch)
treee641febd6f562e0ed1198c160ff353ab513f0612 /drivers/net/znet.c
parent5fa21d821f6972e70942f2c555ec29dde962bdb2 (diff)
[NET]: Avoid allocating skb in skb_pad
First of all it is unnecessary to allocate a new skb in skb_pad since the existing one is not shared. More importantly, our hard_start_xmit interface does not allow a new skb to be allocated since that breaks requeueing. This patch uses pskb_expand_head to expand the existing skb and linearize it if needed. Actually, someone should sift through every instance of skb_pad on a non-linear skb as they do not fit the reasons why this was originally created. Incidentally, this fixes a minor bug when the skb is cloned (tcpdump, TCP, etc.). As it is skb_pad will simply write over a cloned skb. Because of the position of the write it is unlikely to cause problems but still it's best if we don't do it. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/znet.c')
-rw-r--r--drivers/net/znet.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/znet.c b/drivers/net/znet.c
index 3ac047bc727d..a7c089df66e6 100644
--- a/drivers/net/znet.c
+++ b/drivers/net/znet.c
@@ -544,8 +544,7 @@ static int znet_send_packet(struct sk_buff *skb, struct net_device *dev)
544 printk(KERN_DEBUG "%s: ZNet_send_packet.\n", dev->name); 544 printk(KERN_DEBUG "%s: ZNet_send_packet.\n", dev->name);
545 545
546 if (length < ETH_ZLEN) { 546 if (length < ETH_ZLEN) {
547 skb = skb_padto(skb, ETH_ZLEN); 547 if (skb_padto(skb, ETH_ZLEN))
548 if (skb == NULL)
549 return 0; 548 return 0;
550 length = ETH_ZLEN; 549 length = ETH_ZLEN;
551 } 550 }