[NET]: Do not forget to initialize tx_queue_len in tunneling drivers.

net/ipv4/ip_gre.c

@@ -276,6 +276,7 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int
 	  return NULL;
 
 	dev->init = ipgre_tunnel_init;
+	dev->tx_queue_len = 1;
 	nt = dev->priv;
 	nt->parms = *parms;
 
@@ -1269,6 +1270,7 @@ int __init ipgre_init(void)
 	}
 
 	ipgre_fb_tunnel_dev->init = ipgre_fb_tunnel_init;
+	ipgre_fb_tunnel_dev->tx_queue_len = 1;
 
 	if ((err = register_netdev(ipgre_fb_tunnel_dev)))
 		goto fail;

net/ipv4/ipip.c

@@ -246,6 +246,7 @@ static struct ip_tunnel * ipip_tunnel_locate(struct ip_tunnel_parm *parms, int c
 	nt = dev->priv;
 	SET_MODULE_OWNER(dev);
 	dev->init = ipip_tunnel_init;
+	dev->tx_queue_len = 1;
 	dev->destructor = free_netdev;
 	nt->parms = *parms;
 
@@ -892,6 +893,7 @@ int __init ipip_init(void)
 	}
 
 	ipip_fb_tunnel_dev->init = ipip_fb_tunnel_init;
+	ipip_fb_tunnel_dev->tx_queue_len = 1;
 
 	if ((err = register_netdev(ipip_fb_tunnel_dev)))
 	    goto fail;

net/ipv6/sit.c

@@ -184,6 +184,7 @@ static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int
 
 	nt = dev->priv;
 	dev->init = ipip6_tunnel_init;
+	dev->tx_queue_len = 1;
 	nt->parms = *parms;
 
 	if (register_netdevice(dev) < 0) {
@@ -832,6 +833,7 @@ int __init sit_init(void)
 	}
 
 	ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init;
+	ipip6_fb_tunnel_dev->tx_queue_len = 1;
 
 	if ((err =  register_netdev(ipip6_fb_tunnel_dev)))
 		goto fail;