netdev - Re: [PATCH stable 3.11] sit: amend "allow to use rtnl ops on fb tunnel"

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Message-ID: <52669D35.4040103@6wind.com>
Date:	Tue, 22 Oct 2013 17:43:49 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH stable 3.11] sit: amend "allow to use rtnl ops on fb tunnel"

Le 22/10/2013 16:59, Willem de Bruijn a écrit :
> Amend backport to 3.11.y of
>
>   [ Upstream commit 205983c43700ac3a81e7625273a3fa83cd2759b5 ]
>
> The discussion thread in the upstream commit mentions that in
> backports to stable-* branches, the line
>
>    - unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
>
> must be omitted if that branch does not have commit 5e6700b3bf98
> ("sit: add support of x-netns"). This line has correctly been omitted
> in the backport to 3.10, which indeed does not have that commit.
>
> It was also removed in the backport to 3.11.y, which does have that
> commit.
>
> This causes the following steps to hit a BUG at net/core/dev.c:5039:
>
>    `modprobe sit; rmmod sit`
>
> The bug demonstrates that it causes a device to be unregistered twice.
> The simple fix is to apply the one line in the upstream commit that
> was dropped in the backport to 3.11 (3783100374653e2e7fbdf68c710f5).
> This brings the logic in line with upstream linux, net and net-next
> branches.
>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
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