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batman-adv: avoid skb_linearise() if not needed

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Whenever we want to access headers only, we do not need to linearise the whole
packet. Instead we can use pskb_may_pull()

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
This commit is contained in:
Antonio Quartulli 2012-03-16 11:52:31 +01:00
parent f96a8a0b78
commit 8710e2613a
1 changed files with 3 additions and 2 deletions
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5
net/batman-adv/routing.c
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@ -916,8 +916,9 @@ static int check_unicast_ttvn(struct bat_priv *bat_priv,
/* Check whether I have to reroute the packet */
if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) {
/* Linearize the skb before accessing it */
if (skb_linearize(skb) < 0)
/* check if there is enough data before accessing it */
if (pskb_may_pull(skb, sizeof(struct unicast_packet) +
ETH_HLEN) < 0)
return 0;
ethhdr = (struct ethhdr *)(skb->data +