tuntap: restore default qdisc

BugLink: http://bugs.launchpad.net/bugs/1573034
[ Upstream commit 016adb7260f481168c03e09f785184d6d5278894 ]

After commit f84bb1eac027 ("net: fix IFF_NO_QUEUE for drivers using
alloc_netdev"), default qdisc was changed to noqueue because
tuntap does not set tx_queue_len during .setup(). This patch restores
default qdisc by setting tx_queue_len in tun_setup().

Fixes: f84bb1eac027 ("net: fix IFF_NO_QUEUE for drivers using alloc_netdev")
Cc: Phil Sutter <phil@nwl.cc>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 9bc7b0c7d471b4b3012d1fbd00a2c18f42d819c3..2d186bd66d43149d4780110870a81979edaf7f4b 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1001,7 +1001,6 @@ static void tun_net_init(struct net_device *dev)
                /* Zero header length */
                dev->type = ARPHRD_NONE;
                dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
-               dev->tx_queue_len = TUN_READQ_SIZE;  /* We prefer our own queue length */
                break;
 
        case IFF_TAP:
@@ -1013,7 +1012,6 @@ static void tun_net_init(struct net_device *dev)
 
                eth_hw_addr_random(dev);
 
-               dev->tx_queue_len = TUN_READQ_SIZE;  /* We prefer our own queue length */
                break;
        }
 }
@@ -1464,6 +1462,8 @@ static void tun_setup(struct net_device *dev)
 
        dev->ethtool_ops = &tun_ethtool_ops;
        dev->destructor = tun_free_netdev;
+       /* We prefer our own queue length */
+       dev->tx_queue_len = TUN_READQ_SIZE;
 }
 
 /* Trivial set of netlink ops to allow deleting tun or tap