[IP_TUNNEL]: Don't limit the number of tunnels with generic name explicitly.

Use the added dev_alloc_name() call to create tunnel device name,
rather than iterate in a hand-made loop with an artificial limit.

Thanks Patrick for noticing this.

[ The way this works is, when the device is actually registered,
  the generic code noticed the '%' in the name and invokes
  dev_alloc_name() to fully resolve the name.  -DaveM ]
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/ip6_tunnel.h

@@ -14,8 +14,6 @@
 /* capable of receiving packets */
 #define IP6_TNL_F_CAP_RCV 0x20000
 
-#define IP6_TNL_MAX 128
-
 /* IPv6 tunnel */
 
 struct ip6_tnl {

net/ipv4/ip_gre.c

@@ -259,16 +259,8 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int
 
 	if (parms->name[0])
 		strlcpy(name, parms->name, IFNAMSIZ);
-	else {
-		int i;
-		for (i=1; i<100; i++) {
-			sprintf(name, "gre%d", i);
-			if (__dev_get_by_name(&init_net, name) == NULL)
-				break;
-		}
-		if (i==100)
-			goto failed;
-	}
+	else
+		sprintf(name, "gre%%d");
 
 	dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup);
 	if (!dev)

net/ipv4/ipip.c

@@ -221,16 +221,8 @@ static struct ip_tunnel * ipip_tunnel_locate(struct ip_tunnel_parm *parms, int c
 
 	if (parms->name[0])
 		strlcpy(name, parms->name, IFNAMSIZ);
-	else {
-		int i;
-		for (i=1; i<100; i++) {
-			sprintf(name, "tunl%d", i);
-			if (__dev_get_by_name(&init_net, name) == NULL)
-				break;
-		}
-		if (i==100)
-			goto failed;
-	}
+	else
+		sprintf(name, "tunl%%d");
 
 	dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup);
 	if (dev == NULL)

net/ipv6/ip6_tunnel.c

@@ -229,18 +229,11 @@ static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p)
 	char name[IFNAMSIZ];
 	int err;
 
-	if (p->name[0]) {
+	if (p->name[0])
 		strlcpy(name, p->name, IFNAMSIZ);
-	} else {
-		int i;
-		for (i = 1; i < IP6_TNL_MAX; i++) {
-			sprintf(name, "ip6tnl%d", i);
-			if (__dev_get_by_name(&init_net, name) == NULL)
-				break;
-		}
-		if (i == IP6_TNL_MAX)
-			goto failed;
-	}
+	else
+		sprintf(name, "ip6tnl%%d");
+
 	dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
 	if (dev == NULL)
 		goto failed;

net/ipv6/sit.c

@@ -164,16 +164,8 @@ static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int
 
 	if (parms->name[0])
 		strlcpy(name, parms->name, IFNAMSIZ);
-	else {
-		int i;
-		for (i=1; i<100; i++) {
-			sprintf(name, "sit%d", i);
-			if (__dev_get_by_name(&init_net, name) == NULL)
-				break;
-		}
-		if (i==100)
-			goto failed;
-	}
+	else
+		sprintf(name, "sit%%d");
 
 	dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
 	if (dev == NULL)