Re: [PATCH net] net: dsa: mv88e6xxx: fix software VLAN deletion

[David Miller <davem@davemloft.net>]

From: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Date: Fri,  5 Feb 2016 14:04:39 -0500

> The current bridge code calls switchdev_port_obj_del on a VLAN port even
> if the corresponding switchdev_port_obj_add call returned -EOPNOTSUPP.
> 
> If the DSA driver doesn't return -EOPNOTSUPP for a software port VLAN in
> its port_vlan_del function, the VLAN is not deleted. Unbridging the port
> also generates a stack trace for the same reason.
> 
> This can be quickly tested on a VLAN filtering enabled system with:
> 
>     # brctl addbr br0
>     # brctl addif br0 lan0
>     # brctl addbr br1
>     # brctl addif br1 lan1
>     # brctl delif br1 lan1
> 
> Both bridges have a default default_pvid set to 1. lan0 uses the
> hardware VLAN 1 while lan1 falls back to the software VLAN 1.
> 
> Unbridging lan1 does not delete its software VLAN, and thus generates
> the following stack trace:
 ...
> To fix this, return -EOPNOTSUPP in _mv88e6xxx_port_vlan_del instead of
> -ENOENT if the hardware VLAN doesn't exist or the port is not a member.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>

Applied.