[IPV6] ADDRCONF: Convert addrconf_lock to RCU.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 5fc8627..aa2ed8f 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -133,20 +133,18 @@
static inline struct inet6_dev *
__in6_dev_get(struct net_device *dev)
{
- return (struct inet6_dev *)dev->ip6_ptr;
+ return rcu_dereference(dev->ip6_ptr);
}
-extern rwlock_t addrconf_lock;
-
static inline struct inet6_dev *
in6_dev_get(struct net_device *dev)
{
struct inet6_dev *idev = NULL;
- read_lock(&addrconf_lock);
- idev = dev->ip6_ptr;
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
if (idev)
atomic_inc(&idev->refcnt);
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
return idev;
}
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index e459e1a..34489c1 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -189,6 +189,7 @@
struct ipv6_devconf cnf;
struct ipv6_devstat stats;
unsigned long tstamp; /* ipv6InterfaceTable update timestamp */
+ struct rcu_head rcu;
};
extern struct ipv6_devconf ipv6_devconf;
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 6a7320b..72145d4 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1786,7 +1786,7 @@
* use ipv6_get_lladdr if/when it's get exported
*/
- read_lock(&addrconf_lock);
+ rcu_read_lock();
if ((idev = __in6_dev_get(pkt_dev->odev)) != NULL) {
struct inet6_ifaddr *ifp;
@@ -1805,7 +1805,7 @@
}
read_unlock_bh(&idev->lock);
}
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
if (err)
printk("pktgen: ERROR: IPv6 link address not availble.\n");
}
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 825a291..c09ebb7 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -119,9 +119,6 @@
static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
static DEFINE_RWLOCK(addrconf_hash_lock);
-/* Protects inet6 devices */
-DEFINE_RWLOCK(addrconf_lock);
-
static void addrconf_verify(unsigned long);
static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
@@ -318,6 +315,12 @@
/* Nobody refers to this device, we may destroy it. */
+static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
+{
+ struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
+ kfree(idev);
+}
+
void in6_dev_finish_destroy(struct inet6_dev *idev)
{
struct net_device *dev = idev->dev;
@@ -332,7 +335,7 @@
return;
}
snmp6_free_dev(idev);
- kfree(idev);
+ call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
}
static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
@@ -408,9 +411,8 @@
if (netif_carrier_ok(dev))
ndev->if_flags |= IF_READY;
- write_lock_bh(&addrconf_lock);
- dev->ip6_ptr = ndev;
- write_unlock_bh(&addrconf_lock);
+ /* protected by rtnl_lock */
+ rcu_assign_pointer(dev->ip6_ptr, ndev);
ipv6_mc_init_dev(ndev);
ndev->tstamp = jiffies;
@@ -474,7 +476,7 @@
read_lock(&dev_base_lock);
for (dev=dev_base; dev; dev=dev->next) {
- read_lock(&addrconf_lock);
+ rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
@@ -482,7 +484,7 @@
if (changed)
dev_forward_change(idev);
}
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
}
read_unlock(&dev_base_lock);
}
@@ -543,7 +545,7 @@
int hash;
int err = 0;
- read_lock_bh(&addrconf_lock);
+ rcu_read_lock_bh();
if (idev->dead) {
err = -ENODEV; /*XXX*/
goto out2;
@@ -612,7 +614,7 @@
in6_ifa_hold(ifa);
write_unlock(&idev->lock);
out2:
- read_unlock_bh(&addrconf_lock);
+ rcu_read_unlock_bh();
if (likely(err == 0))
atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
@@ -915,7 +917,7 @@
memset(&hiscore, 0, sizeof(hiscore));
read_lock(&dev_base_lock);
- read_lock(&addrconf_lock);
+ rcu_read_lock();
for (dev = dev_base; dev; dev=dev->next) {
struct inet6_dev *idev;
@@ -1127,7 +1129,7 @@
}
read_unlock_bh(&idev->lock);
}
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
read_unlock(&dev_base_lock);
if (!ifa_result)
@@ -1151,7 +1153,7 @@
struct inet6_dev *idev;
int err = -EADDRNOTAVAIL;
- read_lock(&addrconf_lock);
+ rcu_read_lock();
if ((idev = __in6_dev_get(dev)) != NULL) {
struct inet6_ifaddr *ifp;
@@ -1165,7 +1167,7 @@
}
read_unlock_bh(&idev->lock);
}
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
return err;
}
@@ -1466,7 +1468,7 @@
struct inet6_dev *idev = (struct inet6_dev *) data;
unsigned long expires;
- read_lock_bh(&addrconf_lock);
+ rcu_read_lock_bh();
write_lock_bh(&idev->lock);
if (idev->dead)
@@ -1490,7 +1492,7 @@
out:
write_unlock_bh(&idev->lock);
- read_unlock_bh(&addrconf_lock);
+ rcu_read_unlock_bh();
in6_dev_put(idev);
}
@@ -2342,10 +2344,10 @@
Do not dev_put!
*/
if (how == 1) {
- write_lock_bh(&addrconf_lock);
- dev->ip6_ptr = NULL;
idev->dead = 1;
- write_unlock_bh(&addrconf_lock);
+
+ /* protected by rtnl_lock */
+ rcu_assign_pointer(dev->ip6_ptr, NULL);
/* Step 1.5: remove snmp6 entry */
snmp6_unregister_dev(idev);
@@ -3573,10 +3575,10 @@
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
- read_lock_bh(&addrconf_lock);
+ rcu_read_lock_bh();
if (likely(ifp->idev->dead == 0))
__ipv6_ifa_notify(event, ifp);
- read_unlock_bh(&addrconf_lock);
+ rcu_read_unlock_bh();
}
#ifdef CONFIG_SYSCTL
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index b80fc50..a960476 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -56,7 +56,7 @@
int onlink;
onlink = 0;
- read_lock(&addrconf_lock);
+ rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
read_lock_bh(&idev->lock);
@@ -68,7 +68,7 @@
}
read_unlock_bh(&idev->lock);
}
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
return onlink;
}
diff --git a/net/ipv6/ipv6_syms.c b/net/ipv6/ipv6_syms.c
index 7b7b90d..0e8e067 100644
--- a/net/ipv6/ipv6_syms.c
+++ b/net/ipv6/ipv6_syms.c
@@ -14,7 +14,6 @@
EXPORT_SYMBOL(register_inet6addr_notifier);
EXPORT_SYMBOL(unregister_inet6addr_notifier);
EXPORT_SYMBOL(ip6_route_output);
-EXPORT_SYMBOL(addrconf_lock);
EXPORT_SYMBOL(ipv6_setsockopt);
EXPORT_SYMBOL(ipv6_getsockopt);
EXPORT_SYMBOL(inet6_register_protosw);
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index fd87e3c..249e503 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -321,9 +321,9 @@
struct inet6_ifaddr *ifp;
struct sctp_sockaddr_entry *addr;
- read_lock(&addrconf_lock);
+ rcu_read_lock();
if ((in6_dev = __in6_dev_get(dev)) == NULL) {
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
return;
}
@@ -342,7 +342,7 @@
}
read_unlock(&in6_dev->lock);
- read_unlock(&addrconf_lock);
+ rcu_read_unlock();
}
/* Initialize a sockaddr_storage from in incoming skb. */