On 2017年01月03日 21:33, Stefan Hajnoczi wrote:
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.
sk_write_queue were accessed only in this function which runs under process context, so no need for spin_lock_bh() here.
