linux-kernel - Re: [PATCH] net: phy: xgene: disable clk on error paths

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Message-ID: <CAFopSPTm9jr8iedsE7E4CJodRx+XBo_pz2O1-GiKLKkoa_bO5A@mail.gmail.com>
Date:   Mon, 18 Dec 2017 10:12:38 +0700
From:   Quan Nguyen <qnguyen@....com>
To:     Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:     Iyappan Subramanian <isubramanian@....com>,
        Keyur Chudgar <kchudgar@....com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] net: phy: xgene: disable clk on error paths

On Sat, Dec 16, 2017 at 4:52 AM, Alexey Khoroshilov
<khoroshilov@...ras.ru> wrote:
>
> There are several error paths in xgene_mdio_probe(),
> where clk is left undisabled. The patch fixes them.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---
>  drivers/net/phy/mdio-xgene.c | 21 +++++++++++++++------
>  1 file changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/phy/mdio-xgene.c b/drivers/net/phy/mdio-xgene.c
> index bfd3090fb055..07c6048200c6 100644
> --- a/drivers/net/phy/mdio-xgene.c
> +++ b/drivers/net/phy/mdio-xgene.c
> @@ -194,8 +194,11 @@ static int xgene_mdio_reset(struct xgene_mdio_pdata *pdata)
>         }
>
>         ret = xgene_enet_ecc_init(pdata);
> -       if (ret)
> +       if (ret) {
> +               if (pdata->dev->of_node)
> +                       clk_disable_unprepare(pdata->clk);
>                 return ret;
> +       }
>         xgene_gmac_reset(pdata);
>
>         return 0;
> @@ -388,8 +391,10 @@ static int xgene_mdio_probe(struct platform_device *pdev)
>                 return ret;
>
>         mdio_bus = mdiobus_alloc();
> -       if (!mdio_bus)
> -               return -ENOMEM;
> +       if (!mdio_bus) {
> +               ret = -ENOMEM;
> +               goto out_clk;
> +       }
>
>         mdio_bus->name = "APM X-Gene MDIO bus";
>
> @@ -418,7 +423,7 @@ static int xgene_mdio_probe(struct platform_device *pdev)
>                 mdio_bus->phy_mask = ~0;
>                 ret = mdiobus_register(mdio_bus);
>                 if (ret)
> -                       goto out;
> +                       goto out_mdiobus;
>
>                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_HANDLE(dev), 1,
>                                     acpi_register_phy, NULL, mdio_bus, NULL);
> @@ -426,16 +431,20 @@ static int xgene_mdio_probe(struct platform_device *pdev)
>         }
>
>         if (ret)
> -               goto out;
> +               goto out_mdiobus;
>
>         pdata->mdio_bus = mdio_bus;
>         xgene_mdio_status = true;
>
>         return 0;
>
> -out:
> +out_mdiobus:
>         mdiobus_free(mdio_bus);
>
> +out_clk:
> +       if (dev->of_node)
> +               clk_disable_unprepare(pdata->clk);
> +
>         return ret;
>  }
>

Acked.