Commit 9a57a9d2 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

igmp: avoid two atomic ops in igmp_rcv()

in_dev_get() -> __in_dev_get_rcu() in a rcu protected function.
Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 66018506
......@@ -916,18 +916,19 @@ static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
read_unlock(&in_dev->mc_list_lock);
}
/* called in rcu_read_lock() section */
int igmp_rcv(struct sk_buff *skb)
{
/* This basically follows the spec line by line -- see RFC1112 */
struct igmphdr *ih;
struct in_device *in_dev = in_dev_get(skb->dev);
struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
int len = skb->len;
if (in_dev == NULL)
goto drop;
if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
goto drop_ref;
goto drop;
switch (skb->ip_summed) {
case CHECKSUM_COMPLETE:
......@@ -937,7 +938,7 @@ int igmp_rcv(struct sk_buff *skb)
case CHECKSUM_NONE:
skb->csum = 0;
if (__skb_checksum_complete(skb))
goto drop_ref;
goto drop;
}
ih = igmp_hdr(skb);
......@@ -957,7 +958,6 @@ int igmp_rcv(struct sk_buff *skb)
break;
case IGMP_PIM:
#ifdef CONFIG_IP_PIMSM_V1
in_dev_put(in_dev);
return pim_rcv_v1(skb);
#endif
case IGMPV3_HOST_MEMBERSHIP_REPORT:
......@@ -971,8 +971,6 @@ int igmp_rcv(struct sk_buff *skb)
break;
}
drop_ref:
in_dev_put(in_dev);
drop:
kfree_skb(skb);
return 0;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment