tun: fix carrier on/off status

Commit c8d68e6be1c3b242f1c598595830890b65cea64a removed carrier off call
from tun_detach since it's now called on queue disable and not only on
tun close.  This confuses userspace which used this flag to detect a
free tun. To fix, put this back but under if (clean).

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Jason Wang <jasowang@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Tested-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index cc09b67..ffdb844 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -439,10 +439,13 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
        }
 
        if (clean) {
-               if (tun && tun->numqueues == 0 && tun->numdisabled == 0 &&
-                   !(tun->flags & TUN_PERSIST))
-                       if (tun->dev->reg_state == NETREG_REGISTERED)
+               if (tun && tun->numqueues == 0 && tun->numdisabled == 0) {
+                       netif_carrier_off(tun->dev);
+
+                       if (!(tun->flags & TUN_PERSIST) &&
+                           tun->dev->reg_state == NETREG_REGISTERED)
                                unregister_netdevice(tun->dev);
+               }
 
                BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED,
                                 &tfile->socket.flags));
@@ -1658,10 +1661,10 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
                    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);
        }
 
+       netif_carrier_on(tun->dev);
+
        tun_debug(KERN_INFO, tun, "tun_set_iff\n");
 
        if (ifr->ifr_flags & IFF_NO_PI)