linux-kernel - Re: why vdev->config->reset(vdev) is not called in virtinput

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Date:   Fri, 27 Jul 2018 09:16:28 +0800
From:   Jie Deng <jie.deng@...el.com>
To:     "Chen, Jian Jun" <jian.jun.chen@...el.com>,
        "kraxel@...hat.com" <kraxel@...hat.com>
Cc:     jie.deng@...el.com, "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "Wang, Yu1" <yu1.wang@...el.com>,
        "Liu, Shuo A" <shuo.a.liu@...el.com>,
        "Chen, Conghui" <conghui.chen@...el.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: why vdev->config->reset(vdev) is not called in virtinput_freeze

Hi Gerd,

Do you have any comments ?


On 2018/7/23 16:56, Chen, Jian Jun wrote:
> Hi Gerd Hoffmann,
>
> vdev->config->reset(vdev) is not called before vdev->config->del_vqs(vdev) in virtinput_freeze. 
> Backend driver cannot receive notification about the suspend.
> Is it possible that backend driver tries to write a buffer pointed by a desc which has been freed by frontend driver?
>
> Can you please explain why vdev->config->reset(vdev) is not called in virtinput_freeze?
> Virtio_net/virtio_block/virtio_rng... all have the reset in their pm suspend callback.
>
> Best regards,
> Chen Jian Jun
>

Regards,
Jie