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authorJason Wang <jasowang@redhat.com>2013-04-22 20:40:39 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-25 01:48:23 -0400
commite8dbad66ef56074eadb41ed5998acd2320447018 (patch)
treedc9a72436ced43c117bfe447dea24570586f178b /drivers/net/tun.c
parent5ffedc6ed3d066f5c0d2c2106f9081170b3d24fa (diff)
downloadblackbird-op-linux-e8dbad66ef56074eadb41ed5998acd2320447018.tar.gz
blackbird-op-linux-e8dbad66ef56074eadb41ed5998acd2320447018.zip
tuntap: correct the return value in tun_set_iff()
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>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 729ed533bb33..0c9df2fe8f05 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -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;
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