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authorEric Dumazet <eric.dumazet@gmail.com>2009-11-05 20:59:47 -0800
committerDavid S. Miller <davem@davemloft.net>2009-11-05 22:34:22 -0800
commit69df9d5993bd7dd7499ad0e98fe824147fbe5667 (patch)
tree584ed41f2122f46ea2adacfc0442617c88b4c007 /net/ipv6
parentbd27a8750c9b849068d80e298f99940bb7128b33 (diff)
downloadop-kernel-dev-69df9d5993bd7dd7499ad0e98fe824147fbe5667.zip
op-kernel-dev-69df9d5993bd7dd7499ad0e98fe824147fbe5667.tar.gz
ip_frag: dont touch device refcount
When sending fragmentation expiration ICMP V4/V6 messages, we can avoid touching device refcount, thanks to RCU Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/reassembly.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index da5bd0e..dce699f 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -208,18 +208,17 @@ static void ip6_frag_expire(unsigned long data)
fq_kill(fq);
net = container_of(fq->q.net, struct net, ipv6.frags);
- dev = dev_get_by_index(net, fq->iif);
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(net, fq->iif);
if (!dev)
- goto out;
+ goto out_rcu_unlock;
- rcu_read_lock();
IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
- rcu_read_unlock();
/* Don't send error if the first segment did not arrive. */
if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
- goto out;
+ goto out_rcu_unlock;
/*
But use as source device on which LAST ARRIVED
@@ -228,9 +227,9 @@ static void ip6_frag_expire(unsigned long data)
*/
fq->q.fragments->dev = dev;
icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
+out_rcu_unlock:
+ rcu_read_unlock();
out:
- if (dev)
- dev_put(dev);
spin_unlock(&fq->q.lock);
fq_put(fq);
}
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