net: call dev_alloc_name from register_netdevice

Force dev_alloc_name() to be called from register_netdevice() by
dev_get_valid_name(). That allows to remove multiple explicit
dev_alloc_name() calls.

The possibility to call dev_alloc_name in advance remains.

This also fixes veth creation regresion caused by
84c49d8c3e4abefb0a41a77b25aa37ebe8d6b743

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 6 insertions, 50 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index e95dc30110e..3b79bad3d02 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -948,7 +948,7 @@ int dev_alloc_name(struct net_device *dev, const char *name)
 }
 EXPORT_SYMBOL(dev_alloc_name);
 
-static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
+static int dev_get_valid_name(struct net_device *dev, const char *name)
 {
 	struct net *net;
 
@@ -958,7 +958,7 @@ static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt
 	if (!dev_valid_name(name))
 		return -EINVAL;
 
-	if (fmt && strchr(name, '%'))
+	if (strchr(name, '%'))
 		return dev_alloc_name(dev, name);
 	else if (__dev_get_by_name(net, name))
 		return -EEXIST;
@@ -995,7 +995,7 @@ int dev_change_name(struct net_device *dev, const char *newname)
 
 	memcpy(oldname, dev->name, IFNAMSIZ);
 
-	err = dev_get_valid_name(dev, newname, 1);
+	err = dev_get_valid_name(dev, newname);
 	if (err < 0)
 		return err;
 
@@ -5420,8 +5420,8 @@ int register_netdevice(struct net_device *dev)
 		}
 	}
 
-	ret = dev_get_valid_name(dev, dev->name, 0);
-	if (ret)
+	ret = dev_get_valid_name(dev, dev->name);
+	if (ret < 0)
 		goto err_uninit;
 
 	dev->ifindex = dev_new_index(net);
@@ -5562,19 +5562,7 @@ int register_netdev(struct net_device *dev)
 	int err;
 
 	rtnl_lock();
-
-	/*
-	 * If the name is a format string the caller wants us to do a
-	 * name allocation.
-	 */
-	if (strchr(dev->name, '%')) {
-		err = dev_alloc_name(dev, dev->name);
-		if (err < 0)
-			goto out;
-	}
-
 	err = register_netdevice(dev);
-out:
 	rtnl_unlock();
 	return err;
 }
@@ -6056,7 +6044,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
 		/* We get here if we can't use the current device name */
 		if (!pat)
 			goto out;
-		if (dev_get_valid_name(dev, pat, 1))
+		if (dev_get_valid_name(dev, pat) < 0)
 			goto out;
 	}
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 29633125719..5a160f4a1ba 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1572,12 +1572,6 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
 	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
 	dev->real_num_tx_queues = real_num_queues;
 
-	if (strchr(dev->name, '%')) {
-		err = dev_alloc_name(dev, dev->name);
-		if (err < 0)
-			goto err_free;
-	}
-
 	if (tb[IFLA_MTU])
 		dev->mtu = nla_get_u32(tb[IFLA_MTU]);
 	if (tb[IFLA_ADDRESS])
@@ -1597,8 +1591,6 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
 
 	return dev;
 
-err_free:
-	free_netdev(dev);
 err:
 	return ERR_PTR(err);
 }
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 10e9b5aea07..8871067560d 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -413,11 +413,6 @@ static struct ip_tunnel *ipgre_tunnel_locate(struct net *net,
 
 	dev_net_set(dev, net);
 
-	if (strchr(name, '%')) {
-		if (dev_alloc_name(dev, name) < 0)
-			goto failed_free;
-	}
-
 	nt = netdev_priv(dev);
 	nt->parms = *parms;
 	dev->rtnl_link_ops = &ipgre_link_ops;
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index bfa0b989504..378b20b7ca6 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -276,11 +276,6 @@ static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
 
 	dev_net_set(dev, net);
 
-	if (strchr(name, '%')) {
-		if (dev_alloc_name(dev, name) < 0)
-			goto failed_free;
-	}
-
 	nt = netdev_priv(dev);
 	nt->parms = *parms;
 
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 3dff27cba95..36c2842a86b 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -280,11 +280,6 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
 
 	dev_net_set(dev, net);
 
-	if (strchr(name, '%')) {
-		if (dev_alloc_name(dev, name) < 0)
-			goto failed_free;
-	}
-
 	t = netdev_priv(dev);
 	t->parms = *p;
 	err = ip6_tnl_dev_init(dev);
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index c53abcf50d2..a6a32b39b60 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -250,11 +250,6 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
 
 	dev_net_set(dev, net);
 
-	if (strchr(name, '%')) {
-		if (dev_alloc_name(dev, name) < 0)
-			goto failed_free;
-	}
-
 	nt = netdev_priv(dev);
 
 	nt->parms = *parms;
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 4054399be90..80c29d626aa 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1144,10 +1144,6 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 				+ IEEE80211_ENCRYPT_HEADROOM;
 	ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 
-	ret = dev_alloc_name(ndev, ndev->name);
-	if (ret < 0)
-		goto fail;
-
 	ieee80211_assign_perm_addr(local, ndev, type);
 	memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
 	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));