linux-kernel - Re: [PATCH] virtio: Remove unnecessary variable assignments

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Date:   Mon, 20 Jun 2022 10:49:17 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Bo Liu <liubo03@...pur.com>
Cc:     mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio: Remove unnecessary variable assignments

On Fri, Jun 17, 2022 at 01:59:52AM -0400, Bo Liu wrote:
>In function vp_modern_probe(), "mdev->pci_dev" is assigned to
>variable "pci_dev", variable "pci_dev" and "mdev->pci_dev" have
>the same value. There is no need to assign variable "pci_dev" to
>"mdev->pci_dev". So remove it.
>

I suggest rephrasing the description a bit.
Maybe into something like this:

     In function vp_modern_probe(), "pci_dev" is initialized with the
     value of "mdev->pci_dev", so assigning "pci_dev" to "mdev->pci_dev"
     is unnecessary since they store the same value.

Anyway, the patch LGTM:

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

>Signed-off-by: Bo Liu <liubo03@...pur.com>
>---
> drivers/virtio/virtio_pci_modern_dev.c | 2 --
> 1 file changed, 2 deletions(-)
>
>diff --git a/drivers/virtio/virtio_pci_modern_dev.c b/drivers/virtio/virtio_pci_modern_dev.c
>index b790f30b2b56..fa2a9445bb18 100644
>--- a/drivers/virtio/virtio_pci_modern_dev.c
>+++ b/drivers/virtio/virtio_pci_modern_dev.c
>@@ -220,8 +220,6 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev)
>
> 	check_offsets();
>
>-	mdev->pci_dev = pci_dev;
>-
> 	/* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
> 	if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
> 		return -ENODEV;
>-- 
>2.27.0
>