[IPV4]: When possible test for IFF_LOOPBACK and not dev == loopback_dev

Now that multiple loopback devices are becoming possible it makes
the code a little cleaner and more maintainable to test if a deivice
is th a loopback device by testing dev->flags & IFF_LOOPBACK instead
of dev == loopback_dev.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 3 deletions

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 2d2e0cda0470..af5d5b39fc13 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -190,11 +190,15 @@ static int __init ic_open_devs(void)
         rtnl_lock();
 
         /* bring loopback device up first */
-        if (dev_change_flags(loopback_dev, loopback_dev->flags | IFF_UP) < 0)
-                printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev->name);
+        for_each_netdev(&init_net, dev) {
+                if (!(dev->flags & IFF_LOOPBACK))
+                        continue;
+                if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
+                        printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
+        }
 
         for_each_netdev(&init_net, dev) {
-                if (dev == loopback_dev)
+                if (dev->flags & IFF_LOOPBACK)
                         continue;
                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
                     (!(dev->flags & IFF_LOOPBACK) &&