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[NET]: Clean up skb_linearize

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The linearisation operation doesn't need to be super-optimised.  So we can
replace __skb_linearize with __pskb_pull_tail which does the same thing but
is more general.

Also, most users of skb_linearize end up testing whether the skb is linear
or not so it helps to make skb_linearize do just that.

Some callers of skb_linearize also use it to copy cloned data, so it's
useful to have a new function skb_linearize_cow to copy the data if it's
either non-linear or cloned.

Last but not least, I've removed the gfp argument since nobody uses it
anymore.  If it's ever needed we can easily add it back.

Misc bugs fixed by this patch:

* via-velocity error handling (also, no SG => no frags)

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2006-06-09 16:10:40 -07:00
committed by David S. Miller
parent 932ff279a4
commit 364c6badde
9 changed files with 39 additions and 91 deletions
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10
drivers/net/via-velocity.c
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@@ -1899,6 +1899,13 @@ static int velocity_xmit(struct sk_buff *skb, struct net_device *dev)
int pktlen = skb->len;
#ifdef VELOCITY_ZERO_COPY_SUPPORT
if (skb_shinfo(skb)->nr_frags > 6 && __skb_linearize(skb)) {
kfree_skb(skb);
return 0;
}
#endif
spin_lock_irqsave(&vptr->lock, flags);
index = vptr->td_curr[qnum];
@@ -1914,8 +1921,6 @@ static int velocity_xmit(struct sk_buff *skb, struct net_device *dev)
*/
if (pktlen < ETH_ZLEN) {
/* Cannot occur until ZC support */
if(skb_linearize(skb, GFP_ATOMIC))
return 0;
pktlen = ETH_ZLEN;
memcpy(tdinfo->buf, skb->data, skb->len);
memset(tdinfo->buf + skb->len, 0, ETH_ZLEN - skb->len);
@@ -1933,7 +1938,6 @@ static int velocity_xmit(struct sk_buff *skb, struct net_device *dev)
int nfrags = skb_shinfo(skb)->nr_frags;
tdinfo->skb = skb;
if (nfrags > 6) {
skb_linearize(skb, GFP_ATOMIC);
memcpy(tdinfo->buf, skb->data, skb->len);
tdinfo->skb_dma[0] = tdinfo->buf_dma;
td_ptr->tdesc0.pktsize =