linux-kernel - Re: [PATCH] vdpa: Avoid duplicate call to vp_vdpa get

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Date:   Fri, 5 Nov 2021 09:32:53 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Eugenio Pérez <eperezma@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH] vdpa: Avoid duplicate call to vp_vdpa get_status

On Thu, Nov 04, 2021 at 08:58:33PM +0100, Eugenio Pérez wrote:
>It has no sense to call get_status twice, since we already have a
>variable for that.
>
>Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
>---
> drivers/vhost/vdpa.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
>index 01c59ce7e250..10676ea0348b 100644
>--- a/drivers/vhost/vdpa.c
>+++ b/drivers/vhost/vdpa.c
>@@ -167,13 +167,13 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
> 	status_old = ops->get_status(vdpa);
>
> 	/*
> 	 * Userspace shouldn't remove status bits unless reset the
> 	 * status to 0.
> 	 */
>-	if (status != 0 && (ops->get_status(vdpa) & ~status) != 0)
>+	if (status != 0 && (status_old & ~status) != 0)
> 		return -EINVAL;
>
> 	if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
> 		for (i = 0; i < nvqs; i++)
> 			vhost_vdpa_unsetup_vq_irq(v, i);
>
>-- 
>2.27.0
>

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>