linux-kernel - Re: [PATCH 1/2] tuntap: forbid calling TUNSETIFF when detached

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Message-ID: <20130111144236.GC2310@stefanha-thinkpad.muc.redhat.com>
Date:	Fri, 11 Jan 2013 15:42:36 +0100
From:	Stefan Hajnoczi <stefanha@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	davem@...emloft.net, mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tuntap: forbid calling TUNSETIFF when detached

On Fri, Jan 11, 2013 at 04:50:41PM +0800, Jason Wang wrote:
> @@ -1546,6 +1544,9 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>  	struct net_device *dev;
>  	int err;
>  
> +	if (rcu_dereference_protected(tfile->detached, lockdep_rtnl_is_held()))
> +		return -EINVAL;
> +

How come none of the other tfile->detached users call rcu_*()?

Stefan
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