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tuntap: correct the return value in tun_set_iff()

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commit (3be8fbab tuntap: fix error return code in tun_set_iff()) breaks the
creation of multiqueue tuntap since it forbids to create more than one queues
for a multiqueue tuntap device. We need return 0 instead -EBUSY here since we
don't want to re-initialize the device when one or more queues has been already
attached. Add a comment and correct the return value to zero.

Reported-by: Jerry Chu <hkchu@google.com>
Cc: Jerry Chu <hkchu@google.com>
Cc: Wei Yongjun <weiyj.lk@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by:  Jerry Chu <hkchu@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-04-22 20:40:39 +00:00 committed by David S. Miller
parent 5ffedc6ed3
commit e8dbad66ef
1 changed files with 6 additions and 2 deletions
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8
drivers/net/tun.c
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@ -1593,8 +1593,12 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
return err;
if (tun->flags & TUN_TAP_MQ &&
(tun->numqueues + tun->numdisabled > 1))
return -EBUSY;
(tun->numqueues + tun->numdisabled > 1)) {
/* One or more queue has already been attached, no need
* to initialize the device again.
*/
return 0;
}
}
else {
char *name;