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

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Message-Id: <20160213.060838.90896525204354915.davem@davemloft.net>
Date:	Sat, 13 Feb 2016 06:08:38 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	vivien.didelot@...oirfairelinux.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...oirfairelinux.com, andrew@...n.ch,
	kevin.smith@...csyscorp.com, sfeldma@...il.com, jiri@...nulli.us,
	nikolay@...ulusnetworks.com, f.fainelli@...il.com
Subject: Re: [PATCH net] net: dsa: mv88e6xxx: fix software VLAN deletion

From: Vivien Didelot <vivien.didelot@...oirfairelinux.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@...oirfairelinux.com>

Applied.