linux-kernel - Re: [PATCH 1/2] eni_vdpa: Fix an error handling path in 'eni_vdpa

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Date:   Mon, 8 Nov 2021 13:55:30 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     mst <mst@...hat.com>, Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        Arnd Bergmann <arnd@...db.de>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2] eni_vdpa: Fix an error handling path in 'eni_vdpa_probe()'

On Mon, Nov 8, 2021 at 12:15 AM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> In the error handling path, a successful 'vp_legacy_probe()' should be
> balanced by a corresponding 'vp_legacy_remove()' call, as already done in
> the remove function.
>
> Add the missing call and update gotos accordingly.
>
> Fixes: e85087beedca ("eni_vdpa: add vDPA driver for Alibaba ENI")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/vdpa/alibaba/eni_vdpa.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vdpa/alibaba/eni_vdpa.c b/drivers/vdpa/alibaba/eni_vdpa.c
> index 3f788794571a..12b3db6b4517 100644
> --- a/drivers/vdpa/alibaba/eni_vdpa.c
> +++ b/drivers/vdpa/alibaba/eni_vdpa.c
> @@ -501,7 +501,7 @@ static int eni_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>         if (!eni_vdpa->vring) {
>                 ret = -ENOMEM;
>                 ENI_ERR(pdev, "failed to allocate virtqueues\n");
> -               goto err;
> +               goto err_remove_vp_legacy;
>         }
>
>         for (i = 0; i < eni_vdpa->queues; i++) {
> @@ -513,11 +513,13 @@ static int eni_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>         ret = vdpa_register_device(&eni_vdpa->vdpa, eni_vdpa->queues);
>         if (ret) {
>                 ENI_ERR(pdev, "failed to register to vdpa bus\n");
> -               goto err;
> +               goto err_remove_vp_legacy;
>         }
>
>         return 0;
>
> +err_remove_vp_legacy:
> +       vp_legacy_remove(&eni_vdpa->ldev);

Won't vp_legacy_remove() be triggered by the put_devic() below?

Thanks

>  err:
>         put_device(&eni_vdpa->vdpa.dev);
>         return ret;
> --
> 2.30.2
>