tun: Use static attribute groups for sysfs entries

Instead of manual calls of device_create_file() and
device_remove_files(), assign the static attribute groups to netdev
groups array.  This simplifies the code and avoids the possible
races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index be196e8..3ff8cd7 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1565,6 +1565,17 @@ static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
 static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL);
 static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
 
+static struct attribute *tun_dev_attrs[] = {
+       &dev_attr_tun_flags.attr,
+       &dev_attr_owner.attr,
+       &dev_attr_group.attr,
+       NULL
+};
+
+static const struct attribute_group tun_attr_group = {
+       .attrs = tun_dev_attrs
+};
+
 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 {
        struct tun_struct *tun;
@@ -1645,6 +1656,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
                dev_net_set(dev, net);
                dev->rtnl_link_ops = &tun_link_ops;
                dev->ifindex = tfile->ifindex;
+               dev->sysfs_groups[0] = &tun_attr_group;
 
                tun = netdev_priv(dev);
                tun->dev = dev;
@@ -1680,11 +1692,6 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
                err = register_netdevice(tun->dev);
                if (err < 0)
                        goto err_detach;
-
-               if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
-                   device_create_file(&tun->dev->dev, &dev_attr_owner) ||
-                   device_create_file(&tun->dev->dev, &dev_attr_group))
-                       pr_err("Failed to create tun sysfs files\n");
        }
 
        netif_carrier_on(tun->dev);