linux-kernel - Re: [PATCH 3/4] vDPA/ifcvf: Fix return value check for vdpa_alloc

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Date:   Mon, 26 Jul 2021 11:28:55 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Xie Yongji <xieyongji@...edance.com>
Cc:     mst@...hat.com, jasowang@...hat.com, dan.carpenter@...cle.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] vDPA/ifcvf: Fix return value check for
 vdpa_alloc_device()

On Thu, Jul 15, 2021 at 04:00:25PM +0800, Xie Yongji wrote:
>The vdpa_alloc_device() returns an error pointer upon
>failure, not NULL. To handle the failure correctly, this
>replaces NULL check with IS_ERR() check and propagate the
>error upwards.
>
>Fixes: 5a2414bc454e ("virtio: Intel IFC VF driver for VDPA")
>Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
>Signed-off-by: Xie Yongji <xieyongji@...edance.com>
>---
> drivers/vdpa/ifcvf/ifcvf_main.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
>index 21b78f1cd521..351c6cfb24c3 100644
>--- a/drivers/vdpa/ifcvf/ifcvf_main.c
>+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
>@@ -493,9 +493,9 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>
> 	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
> 				    dev, &ifc_vdpa_ops, NULL);
>-	if (adapter == NULL) {
>+	if (IS_ERR(adapter)) {
> 		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
>-		return -ENOMEM;
>+		return PTR_ERR(adapter);
> 	}
>
> 	pci_set_master(pdev);
>-- 
>2.11.0
>

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