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macvlan: play well with ipvlan device 

If device is already used as an ipvlan port then refuse to
use it as a macvlan port at early stage of port creation.

	thost1:~# ip link add link eth0 ipvl0 type ipvlan
	thost1:~# echo $?
	0
	thost1:~# ip link add link eth0 mvl0 type macvlan
	RTNETLINK answers: Device or resource busy
	thost1:~# echo $?
	2
	thost1:~#

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mahesh Bandewar 2014-12-06 15:53:46 -08:00 committed by David S. Miller
parent 5933fea7aa
commit d6b00fec5d
1 changed files with 3 additions and 0 deletions
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3
drivers/net/macvlan.c
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@ -1057,6 +1057,9 @@ static int macvlan_port_create(struct net_device *dev)
if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
return -EINVAL;
if (netif_is_ipvlan_port(dev))
return -EBUSY;
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (port == NULL)
return -ENOMEM;