linux-kernel - Re: [PATCH v2] fsl_ucc_hdlc: add a check of the return value from hdlc

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Message-ID: <896acfac-fadb-016b-20ff-a06e18edb4d9@csgroup.eu>
Date:   Mon, 28 Aug 2023 08:37:55 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Alexandra Diupina <adiupina@...ralinux.ru>,
        Zhao Qiang <qiang.zhao@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "David S. Miller" <davem@...emloft.net>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>
Subject: Re: [PATCH v2] fsl_ucc_hdlc: add a check of the return value from
 hdlc_open



Le 28/08/2023 à 10:27, Alexandra Diupina a écrit :
> [Vous ne recevez pas souvent de courriers de adiupina@...ralinux.ru. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> Process the result of hold_open() and return it from
> uhdlc_open() in case of an error
> It is necessary to pass the error code up the control flow,
> similar to a possible error in request_irq()
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: c19b6d246a35 ("drivers/net: support hdlc function for QE-UCC")
> Signed-off-by: Alexandra Diupina <adiupina@...ralinux.ru>
> ---
> v2: Remove the 'rc' variable (stores the return value of the
> hdlc_open()) as Christophe Leroy <christophe.leroy@...roup.eu> suggested
>   drivers/net/wan/fsl_ucc_hdlc.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)

I think you did a mistake. A v2 should substitute v1, not come in 
addition to it. So you have to squash this patch into previous one 
before resending.

Christophe

> 
> diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
> index cdd9489c712e..4164abea7725 100644
> --- a/drivers/net/wan/fsl_ucc_hdlc.c
> +++ b/drivers/net/wan/fsl_ucc_hdlc.c
> @@ -708,7 +708,6 @@ static int uhdlc_open(struct net_device *dev)
>          hdlc_device *hdlc = dev_to_hdlc(dev);
>          struct ucc_hdlc_private *priv = hdlc->priv;
>          struct ucc_tdm *utdm = priv->utdm;
> -       int rc = 0;
> 
>          if (priv->hdlc_busy != 1) {
>                  if (request_irq(priv->ut_info->uf_info.irq,
> @@ -732,12 +731,10 @@ static int uhdlc_open(struct net_device *dev)
>                  napi_enable(&priv->napi);
>                  netdev_reset_queue(dev);
>                  netif_start_queue(dev);
> -               rc = hdlc_open(dev);
> -               if (rc)
> -                       return rc;
> +               return hdlc_open(dev);
>          }
> 
> -       return rc;
> +       return 0;
>   }
> 
>   static void uhdlc_memclean(struct ucc_hdlc_private *priv)
> --
> 2.30.2
>