batman-adv: avoid skb_linearise() if not needed
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>
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@ -916,8 +916,9 @@ static int check_unicast_ttvn(struct bat_priv *bat_priv,
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/* Check whether I have to reroute the packet */
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if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) {
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/* Linearize the skb before accessing it */
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if (skb_linearize(skb) < 0)
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/* check if there is enough data before accessing it */
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if (pskb_may_pull(skb, sizeof(struct unicast_packet) +
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ETH_HLEN) < 0)
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return 0;
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ethhdr = (struct ethhdr *)(skb->data +
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