netdev - Re: [PATCH v2] vsock/virtio: set vsock frontend ready in virtio_vsock

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Date:   Tue, 20 Jul 2021 15:54:53 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xianting Tian <xianting.tian@...ux.alibaba.com>,
        stefanha@...hat.com, sgarzare@...hat.com, davem@...emloft.net,
        kuba@...nel.org
Cc:     kvm@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] vsock/virtio: set vsock frontend ready in
 virtio_vsock_probe()


在 2021/7/20 下午3:13, Xianting Tian 写道:
> Add the missed virtio_device_ready() to set vsock frontend ready.
>
> Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com>
> ---
>   net/vmw_vsock/virtio_transport.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> index e0c2c992a..dc834b8fd 100644
> --- a/net/vmw_vsock/virtio_transport.c
> +++ b/net/vmw_vsock/virtio_transport.c
> @@ -639,6 +639,8 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
>   
>   	mutex_unlock(&the_virtio_vsock_mutex);
>   
> +	virtio_device_ready(vdev);
> +
>   	return 0;
>   
>   out:


Just notice this:

commit 5b40a7daf51812b35cf05d1601a779a7043f8414
Author: Rusty Russell <rusty@...tcorp.com.au>
Date:   Tue Feb 17 16:12:44 2015 +1030

     virtio: don't set VIRTIO_CONFIG_S_DRIVER_OK twice.

     I noticed this with the console device.  It's not *wrong*, just a bit
     weird.

     Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index b9f70dfc4751..5ce2aa48fc6e 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -236,7 +236,10 @@ static int virtio_dev_probe(struct device *_d)
         if (err)
                 goto err;

-       add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
+       /* If probe didn't do it, mark device DRIVER_OK ourselves. */
+       if (!(dev->config->get_status(dev) & VIRTIO_CONFIG_S_DRIVER_OK))
+               virtio_device_ready(dev);
+
         if (drv->scan)
                 drv->scan(dev);

So I think we need to be consistent: switch to use virtio_device_ready() 
for all the drivers, and then we can remove this step and warn if 
(DRIVER_OK) is not set.

Thanks