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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/ipv4/ip_fragment.c
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/ipv4/ip_fragment.c')
-rw-r--r--net/ipv4/ip_fragment.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 575f9bd..b007f8a 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -206,10 +206,11 @@ static void ip_expire(unsigned long arg)
struct sk_buff *head = qp->q.fragments;
/* Send an ICMP "Fragment Reassembly Timeout" message. */
- if ((head->dev = dev_get_by_index(net, qp->iif)) != NULL) {
+ rcu_read_lock();
+ head->dev = dev_get_by_index_rcu(net, qp->iif);
+ if (head->dev)
icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);
- dev_put(head->dev);
- }
+ rcu_read_unlock();
}
out:
spin_unlock(&qp->q.lock);
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