[NET]: Rework dev_base via list_head (v3)
Cleanup of dev_base list use, with the aim to simplify making device
list per-namespace. In almost every occasion, use of dev_base variable
and dev->next pointer could be easily replaced by for_each_netdev
loop. A few most complicated places were converted to using
first_netdev()/next_netdev().
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 5c2a995..764a56a 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -799,9 +799,10 @@
skip_ndevs = cb->args[0];
skip_naddr = cb->args[1];
- for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
+ idx = 0;
+ for_each_netdev(dev) {
if (idx < skip_ndevs)
- continue;
+ goto cont;
else if (idx > skip_ndevs) {
/* Only skip over addresses for first dev dumped
* in this iteration (idx == skip_ndevs) */
@@ -809,18 +810,20 @@
}
if ((dn_db = dev->dn_ptr) == NULL)
- continue;
+ goto cont;
for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
ifa = ifa->ifa_next, dn_idx++) {
if (dn_idx < skip_naddr)
- continue;
+ goto cont;
if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, RTM_NEWADDR,
NLM_F_MULTI) < 0)
goto done;
}
+cont:
+ idx++;
}
done:
cb->args[0] = idx;
@@ -1296,7 +1299,7 @@
struct net_device *dev;
rtnl_lock();
- for(dev = dev_base; dev; dev = dev->next)
+ for_each_netdev(dev)
dn_dev_down(dev);
rtnl_unlock();
@@ -1307,7 +1310,7 @@
struct net_device *dev;
rtnl_lock();
- for(dev = dev_base; dev; dev = dev->next) {
+ for_each_netdev(dev) {
if (dev->flags & IFF_UP)
dn_dev_up(dev);
}
@@ -1325,62 +1328,56 @@
}
#ifdef CONFIG_PROC_FS
-static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
+static inline int is_dn_dev(struct net_device *dev)
{
- do {
- dev = dev->next;
- } while(dev && !dev->dn_ptr);
-
- return dev;
-}
-
-static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
-{
- struct net_device *dev;
-
- dev = dev_base;
- if (dev && !dev->dn_ptr)
- dev = dn_dev_get_next(seq, dev);
- if (pos) {
- while(dev && (dev = dn_dev_get_next(seq, dev)))
- --pos;
- }
- return dev;
+ return dev->dn_ptr != NULL;
}
static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
{
- if (*pos) {
- struct net_device *dev;
- read_lock(&dev_base_lock);
- dev = dn_dev_get_idx(seq, *pos - 1);
- if (dev == NULL)
- read_unlock(&dev_base_lock);
- return dev;
+ int i;
+ struct net_device *dev;
+
+ read_lock(&dev_base_lock);
+
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
+
+ i = 1;
+ for_each_netdev(dev) {
+ if (!is_dn_dev(dev))
+ continue;
+
+ if (i++ == *pos)
+ return dev;
}
- return SEQ_START_TOKEN;
+
+ return NULL;
}
static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- struct net_device *dev = v;
- loff_t one = 1;
+ struct net_device *dev;
- if (v == SEQ_START_TOKEN) {
- dev = dn_dev_seq_start(seq, &one);
- } else {
- dev = dn_dev_get_next(seq, dev);
- if (dev == NULL)
- read_unlock(&dev_base_lock);
- }
++*pos;
- return dev;
+
+ dev = (struct net_device *)v;
+ if (v == SEQ_START_TOKEN)
+ dev = net_device_entry(&dev_base_head);
+
+ for_each_netdev_continue(dev) {
+ if (!is_dn_dev(dev))
+ continue;
+
+ return dev;
+ }
+
+ return NULL;
}
static void dn_dev_seq_stop(struct seq_file *seq, void *v)
{
- if (v && v != SEQ_START_TOKEN)
- read_unlock(&dev_base_lock);
+ read_unlock(&dev_base_lock);
}
static char *dn_type2asc(char type)