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tun: fix carrier on/off status 

Commit c8d68e6be1 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>
This commit is contained in:
Michael S. Tsirkin 2013-01-28 00:38:02 +00:00 committed by David S. Miller
parent 604dfd6efc
commit af668b3c27
1 changed files with 8 additions and 5 deletions
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13
drivers/net/tun.c
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@ -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)