netdev - Re: [PATCH net] lwtunnel: valid encap attr check should return 0 when lwtunnel is disabled

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Date:   Wed, 08 Feb 2017 12:55:26 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     dsa@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, pupilla@...ero.it
Subject: Re: [PATCH net] lwtunnel: valid encap attr check should return 0
 when lwtunnel is disabled

From: David Ahern <dsa@...ulusnetworks.com>
Date: Wed,  8 Feb 2017 09:29:00 -0800

> An error was reported upgrading to 4.9.8:
>     root@...hoon:~# ip route add default table 210 nexthop dev eth0 via 10.68.64.1
>     weight 1 nexthop dev eth0 via 10.68.64.2 weight 1
>     RTNETLINK answers: Operation not supported
> 
> The problem occurs when CONFIG_LWTUNNEL is not enabled and a multipath
> route is submitted.
> 
> The point of lwtunnel_valid_encap_type_attr is catch modules that
> need to be loaded before any references are taken with rntl held. With
> CONFIG_LWTUNNEL disabled, there will be no modules to load so the
> lwtunnel_valid_encap_type_attr stub should just return 0.
> 
> Fixes: 9ed59592e3e3 ("lwtunnel: fix autoload of lwt modules")
> Reported-by: pupilla@...ero.it
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>

Applied and queued up for -stable, thanks for fixing this so quickly David.