linux-kernel - Re: [PATCH V3 18/19] virtio_vdpa: don't warn when fail to disable vq

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Date:   Fri, 5 Feb 2021 10:24:59 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, shahafs@...lanox.com,
        lulu@...hat.com, sgarzare@...hat.com, rdunlap@...radead.org
Subject: Re: [PATCH V3 18/19] virtio_vdpa: don't warn when fail to disable vq

On Mon, Jan 04, 2021 at 02:55:02PM +0800, Jason Wang wrote:
> There's no guarantee that the device can disable a specific virtqueue
> through set_vq_ready(). One example is the modern virtio-pci
> device. So this patch removes the warning.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>


Do we need the read as a kind of flush though?

> ---
>  drivers/virtio/virtio_vdpa.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> index 4a9ddb44b2a7..e28acf482e0c 100644
> --- a/drivers/virtio/virtio_vdpa.c
> +++ b/drivers/virtio/virtio_vdpa.c
> @@ -225,9 +225,8 @@ static void virtio_vdpa_del_vq(struct virtqueue *vq)
>  	list_del(&info->node);
>  	spin_unlock_irqrestore(&vd_dev->lock, flags);
>  
> -	/* Select and deactivate the queue */
> +	/* Select and deactivate the queue (best effort) */
>  	ops->set_vq_ready(vdpa, index, 0);
> -	WARN_ON(ops->get_vq_ready(vdpa, index));
>  
>  	vring_del_virtqueue(vq);
>  
> -- 
> 2.25.1