netdev - Re: [PATCH,v2,net-next 1/2] tun: enable NAPI for TUN/TAP driver

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Date:   Fri, 22 Sep 2017 10:11:00 -0700
From:   Mahesh Bandewar (महेश बंडेवार) 
        <maheshb@...gle.com>
To:     Petar Penkov <peterpenkov96@...il.com>
Cc:     linux-netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        David Miller <davem@...emloft.net>,
        Petar Bozhidarov Penkov <ppenkov@...nford.edu>
Subject: Re: [PATCH,v2,net-next 1/2] tun: enable NAPI for TUN/TAP driver

>  #ifdef CONFIG_TUN_VNET_CROSS_LE
>  static inline bool tun_legacy_is_little_endian(struct tun_struct *tun)
>  {
> @@ -541,6 +604,11 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
>
>         tun = rtnl_dereference(tfile->tun);
>
> +       if (tun && clean) {
> +               tun_napi_disable(tun, tfile);
are we missing synchronize_net() separating disable and del calls?
> +               tun_napi_del(tun, tfile);
> +       }
> +
>         if (tun && !tfile->detached) {
>                 u16 index = tfile->queue_index;
>                 BUG_ON(index >= tun->numqueues);