openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

decnet: use RCU to find network devices 

When showing device statistics use RCU rather than read_lock(&dev_base_lock)
Compile tested only.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2009-11-10 07:54:53 +00:00 committed by David S. Miller
parent e576b9ef41
commit fa918602b6
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
net/decnet/dn_dev.c
View File

@ -856,9 +856,7 @@ 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;
@ -1323,18 +1321,18 @@ 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;
@ -1355,7 +1353,7 @@ 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;
@ -1366,9 +1364,9 @@ 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)