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authorEric Dumazet <eric.dumazet@gmail.com>2010-10-19 04:39:26 +0400
committerDavid S. Miller <davem@davemloft.net>2010-10-19 14:50:48 +0400
commit8723e1b4ad9be4444423b4d41509ce859a629649 (patch)
tree00b0121c12e62736807e998b22b8964f1a5e1df9 /net/ipv4/devinet.c
parent9e917dca74138cccf398ce8bb924c7fd2980ec1d (diff)
downloadlinux-8723e1b4ad9be4444423b4d41509ce859a629649.tar.xz
inet: RCU changes in inetdev_by_index()
Convert inetdev_by_index() to not increment in_dev refcount. Callers hold RCU or RTNL, and should not decrement in_dev refcount. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index c2ff48fa18c7..dc94b0316b78 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -403,6 +403,9 @@ static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
return inet_insert_ifa(ifa);
}
+/* Caller must hold RCU or RTNL :
+ * We dont take a reference on found in_device
+ */
struct in_device *inetdev_by_index(struct net *net, int ifindex)
{
struct net_device *dev;
@@ -411,7 +414,7 @@ struct in_device *inetdev_by_index(struct net *net, int ifindex)
rcu_read_lock();
dev = dev_get_by_index_rcu(net, ifindex);
if (dev)
- in_dev = in_dev_get(dev);
+ in_dev = rcu_dereference_rtnl(dev->ip_ptr);
rcu_read_unlock();
return in_dev;
}
@@ -453,8 +456,6 @@ static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg
goto errout;
}
- __in_dev_put(in_dev);
-
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
ifap = &ifa->ifa_next) {
if (tb[IFA_LOCAL] &&