netdev - Re: [PATCH net 1/2] vhost_net: fix ubuf refcount incorrectly when sendmsg fails

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Date:   Mon, 14 Dec 2020 21:45:45 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     wangyunjian <wangyunjian@...wei.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        virtualization@...ts.linux-foundation.org,
        "Lilijun (Jerry)" <jerry.lilijun@...wei.com>,
        chenchanghu <chenchanghu@...wei.com>,
        xudingke <xudingke@...wei.com>,
        "huangbin (J)" <brian.huangbin@...wei.com>
Subject: Re: [PATCH net 1/2] vhost_net: fix ubuf refcount incorrectly when
 sendmsg fails

On Mon, Dec 14, 2020 at 8:59 PM wangyunjian <wangyunjian@...wei.com> wrote:
>
> From: Yunjian Wang <wangyunjian@...wei.com>
>
> Currently the vhost_zerocopy_callback() maybe be called to decrease
> the refcount when sendmsg fails in tun. The error handling in vhost
> handle_tx_zerocopy() will try to decrease the same refcount again.
> This is wrong. To fix this issue, we only call vhost_net_ubuf_put()
> when vq->heads[nvq->desc].len == VHOST_DMA_IN_PROGRESS.
>
> Fixes: 4477138fa0ae ("tun: properly test for IFF_UP")
> Fixes: 90e33d459407 ("tun: enable napi_gro_frags() for TUN/TAP driver")
>
> Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>

Patch looks good to me. Thanks.

But I think the right Fixes tag would be

Fixes: 0690899b4d45 ("tun: experimental zero copy tx support")