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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-10-19 02:39:26 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-10-19 12:50:48 +0200 |
| commit | 8723e1b4ad9be4444423b4d41509ce859a629649 (patch) | |
| tree | 00b0121c12e62736807e998b22b8964f1a5e1df9 /net/ipv4/devinet.c | |
| parent | net: avoid a dev refcount in ip_mc_find_dev() (diff) | |
| download | linux-8723e1b4ad9be4444423b4d41509ce859a629649.tar.xz linux-8723e1b4ad9be4444423b4d41509ce859a629649.zip | |
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.c | 7 |
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] && |