linux-kernel - Re: [PATCH net-next V2 3/3] tun: rx batching

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Message-ID: <20170103133303.GC14707@stefanha-x1.localdomain>
Date:   Tue, 3 Jan 2017 13:33:03 +0000
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next V2 3/3] tun: rx batching

On Wed, Dec 28, 2016 at 04:09:31PM +0800, Jason Wang wrote:
> +static int tun_rx_batched(struct tun_file *tfile, struct sk_buff *skb,
> +			  int more)
> +{
> +	struct sk_buff_head *queue = &tfile->sk.sk_write_queue;
> +	struct sk_buff_head process_queue;
> +	int qlen;
> +	bool rcv = false;
> +
> +	spin_lock(&queue->lock);

Should this be spin_lock_bh()?  Below and in tun_get_user() there are
explicit local_bh_disable() calls so I guess BHs can interrupt us here
and this would deadlock.

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