netdev - Re: [Patch net-next 2/2] netns: avoid disabling irq for netns id

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Message-ID: <7de98923-0cfb-5937-d32b-bdaee7ec10dc@6wind.com>
Date:   Fri, 2 Sep 2016 10:12:21 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Subject: Re: [Patch net-next 2/2] netns: avoid disabling irq for netns id

Le 02/09/2016 à 06:53, Cong Wang a écrit :
> We never read or change netns id in hardirq context,
> the only place we read netns id in softirq context
> is in vxlan_xmit(). So, it should be enough to just
> disable BH.

Are you sure? Did you audit all part of the code?
peernet2id() is called from netlink core system (do_one_broadcast()). Are you
sure that no driver call this function from an hard irq context?

I think that NETLINK_LISTEN_ALL_NSID is largely untested, so it will be hard to
detect a bug introduced in this feature.