netdev - Re: [PATCH 1/3] caif_virtio: remove virtqueue_disable

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Date:   Mon, 20 Jun 2022 05:02:34 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org, erwan.yvin@...ricsson.com
Subject: Re: [PATCH 1/3] caif_virtio: remove virtqueue_disable_cb() in probe

On Mon, Jun 20, 2022 at 01:11:13PM +0800, Jason Wang wrote:
> This disabling is a just a hint with best effort, there's no guarantee
> that device doesn't send notification. The driver should survive with
> that, so let's remove it.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

I guess, but frankly this change feels gratituous, and just might
uncover latent bugs. Which would be fine if we were out to
find and fix them, but given this was compile-tested only,
I'm not sure that's the case.


> ---
>  drivers/net/caif/caif_virtio.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/net/caif/caif_virtio.c b/drivers/net/caif/caif_virtio.c
> index 5458f57177a0..c677ded81133 100644
> --- a/drivers/net/caif/caif_virtio.c
> +++ b/drivers/net/caif/caif_virtio.c
> @@ -705,9 +705,6 @@ static int cfv_probe(struct virtio_device *vdev)
>  	netdev->needed_headroom = cfv->tx_hr;
>  	netdev->needed_tailroom = cfv->tx_tr;
>  
> -	/* Disable buffer release interrupts unless we have stopped TX queues */
> -	virtqueue_disable_cb(cfv->vq_tx);
> -
>  	netdev->mtu = cfv->mtu - cfv->tx_tr;
>  	vdev->priv = cfv;
>  
> -- 
> 2.25.1