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path: root/net/decnet/dn_dev.c
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Diffstat (limited to 'net/decnet/dn_dev.c')
-rw-r--r--net/decnet/dn_dev.c53
1 files changed, 31 insertions, 22 deletions
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 1b1daeb151f2..238af093495b 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -68,7 +68,7 @@ extern struct neigh_table dn_neigh_table;
*/
__le16 decnet_address = 0;
-static DEFINE_RWLOCK(dndev_lock);
+static DEFINE_SPINLOCK(dndev_lock);
static struct net_device *decnet_default_device;
static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
@@ -499,7 +499,8 @@ rarok:
struct net_device *dn_dev_get_default(void)
{
struct net_device *dev;
- read_lock(&dndev_lock);
+
+ spin_lock(&dndev_lock);
dev = decnet_default_device;
if (dev) {
if (dev->dn_ptr)
@@ -507,7 +508,8 @@ struct net_device *dn_dev_get_default(void)
else
dev = NULL;
}
- read_unlock(&dndev_lock);
+ spin_unlock(&dndev_lock);
+
return dev;
}
@@ -517,13 +519,15 @@ int dn_dev_set_default(struct net_device *dev, int force)
int rv = -EBUSY;
if (!dev->dn_ptr)
return -ENODEV;
- write_lock(&dndev_lock);
+
+ spin_lock(&dndev_lock);
if (force || decnet_default_device == NULL) {
old = decnet_default_device;
decnet_default_device = dev;
rv = 0;
}
- write_unlock(&dndev_lock);
+ spin_unlock(&dndev_lock);
+
if (old)
dev_put(old);
return rv;
@@ -531,26 +535,29 @@ int dn_dev_set_default(struct net_device *dev, int force)
static void dn_dev_check_default(struct net_device *dev)
{
- write_lock(&dndev_lock);
+ spin_lock(&dndev_lock);
if (dev == decnet_default_device) {
decnet_default_device = NULL;
} else {
dev = NULL;
}
- write_unlock(&dndev_lock);
+ spin_unlock(&dndev_lock);
+
if (dev)
dev_put(dev);
}
+/*
+ * Called with RTNL
+ */
static struct dn_dev *dn_dev_by_index(int ifindex)
{
struct net_device *dev;
struct dn_dev *dn_dev = NULL;
- dev = dev_get_by_index(&init_net, ifindex);
- if (dev) {
+
+ dev = __dev_get_by_index(&init_net, ifindex);
+ if (dev)
dn_dev = dev->dn_ptr;
- dev_put(dev);
- }
return dn_dev;
}
@@ -571,7 +578,7 @@ static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
struct dn_ifaddr *ifa, **ifap;
int err = -EINVAL;
- if (net != &init_net)
+ if (!net_eq(net, &init_net))
goto errout;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
@@ -610,7 +617,7 @@ static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
struct dn_ifaddr *ifa;
int err;
- if (net != &init_net)
+ if (!net_eq(net, &init_net))
return -EINVAL;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
@@ -724,7 +731,7 @@ static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
struct dn_dev *dn_db;
struct dn_ifaddr *ifa;
- if (net != &init_net)
+ if (!net_eq(net, &init_net))
return 0;
skip_ndevs = cb->args[0];
@@ -768,13 +775,17 @@ static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
struct dn_ifaddr *ifa;
int rv = -ENODEV;
+
if (dn_db == NULL)
goto out;
+
+ rtnl_lock();
ifa = dn_db->ifa_list;
if (ifa != NULL) {
*addr = ifa->ifa_local;
rv = 0;
}
+ rtnl_unlock();
out:
return rv;
}
@@ -796,9 +807,7 @@ int dn_dev_bind_default(__le16 *addr)
dev = dn_dev_get_default();
last_chance:
if (dev) {
- read_lock(&dev_base_lock);
rv = dn_dev_get_first(dev, addr);
- read_unlock(&dev_base_lock);
dev_put(dev);
if (rv == 0 || dev == init_net.loopback_dev)
return rv;
@@ -1263,18 +1272,18 @@ static inline int is_dn_dev(struct net_device *dev)
}
static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
- __acquires(&dev_base_lock)
+ __acquires(rcu)
{
int i;
struct net_device *dev;
- read_lock(&dev_base_lock);
+ rcu_read_lock();
if (*pos == 0)
return SEQ_START_TOKEN;
i = 1;
- for_each_netdev(&init_net, dev) {
+ for_each_netdev_rcu(&init_net, dev) {
if (!is_dn_dev(dev))
continue;
@@ -1295,7 +1304,7 @@ static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
if (v == SEQ_START_TOKEN)
dev = net_device_entry(&init_net.dev_base_head);
- for_each_netdev_continue(&init_net, dev) {
+ for_each_netdev_continue_rcu(&init_net, dev) {
if (!is_dn_dev(dev))
continue;
@@ -1306,9 +1315,9 @@ static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
}
static void dn_dev_seq_stop(struct seq_file *seq, void *v)
- __releases(&dev_base_lock)
+ __releases(rcu)
{
- read_unlock(&dev_base_lock);
+ rcu_read_unlock();
}
static char *dn_type2asc(char type)