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Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index da14c49284f..dc94b0316b7 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -209,7 +209,7 @@ static void inetdev_destroy(struct in_device *in_dev)
inet_free_ifa(ifa);
}
- dev->ip_ptr = NULL;
+ rcu_assign_pointer(dev->ip_ptr, NULL);
devinet_sysctl_unregister(in_dev);
neigh_parms_release(&arp_tbl, in_dev->arp_parms);
@@ -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] &&
@@ -1059,7 +1060,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
switch (event) {
case NETDEV_REGISTER:
printk(KERN_DEBUG "inetdev_event: bug\n");
- dev->ip_ptr = NULL;
+ rcu_assign_pointer(dev->ip_ptr, NULL);
break;
case NETDEV_UP:
if (!inetdev_valid_mtu(dev->mtu))