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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2006-06-23 11:06:41 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-06-23 11:06:41 +0200 |
| commit | 5b057c6b1a25d57edf2b4d1e956e50936480a9ff (patch) | |
| tree | e641febd6f562e0ed1198c160ff353ab513f0612 /drivers/net/epic100.c | |
| parent | Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/usb-2.6 (diff) | |
| download | linux-5b057c6b1a25d57edf2b4d1e956e50936480a9ff.tar.xz linux-5b057c6b1a25d57edf2b4d1e956e50936480a9ff.zip | |
[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/epic100.c')
| -rw-r--r-- | drivers/net/epic100.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/net/epic100.c b/drivers/net/epic100.c index 8d680ce600d7..724d7dc35fa3 100644 --- a/drivers/net/epic100.c +++ b/drivers/net/epic100.c @@ -1027,11 +1027,8 @@ static int epic_start_xmit(struct sk_buff *skb, struct net_device *dev) u32 ctrl_word; unsigned long flags; - if (skb->len < ETH_ZLEN) { - skb = skb_padto(skb, ETH_ZLEN); - if (skb == NULL) - return 0; - } + if (skb_padto(skb, ETH_ZLEN)) + return 0; /* Caution: the write order is important here, set the field with the "ownership" bit last. */ |