linux-kernel - Re: [net-next PATCH v7 07/16] net: mii_timestamper: check NULL in unregister_mii

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Date:   Thu, 11 Mar 2021 14:04:48 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Calvin Johnson <calvin.johnson@....nxp.com>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>, Saravana Kannan <saravanak@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Diana Madalina Craciun <diana.craciun@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux.cj" <linux.cj@...il.com>, netdev <netdev@...r.kernel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next PATCH v7 07/16] net: mii_timestamper: check NULL in unregister_mii_timestamper()

On Thu, Mar 11, 2021 at 8:21 AM Calvin Johnson
<calvin.johnson@....nxp.com> wrote:
>
> Callers of unregister_mii_timestamper() currently check for NULL
> value of mii_ts before calling it.
>
> Place the NULL check inside unregister_mii_timestamper() and update
> the callers accordingly

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

(Don't remember if it has been suggested by somebody, in that case
perhaps Suggested-by?)

> Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> ---
>
> Changes in v7:
> - check NULL in unregister_mii_timestamper()
>
> Changes in v6: None
> Changes in v5: None
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
>  drivers/net/mdio/of_mdio.c        | 6 ++----
>  drivers/net/phy/mii_timestamper.c | 3 +++
>  drivers/net/phy/phy_device.c      | 3 +--
>  3 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
> index 612a37970f14..48b6b8458c17 100644
> --- a/drivers/net/mdio/of_mdio.c
> +++ b/drivers/net/mdio/of_mdio.c
> @@ -115,15 +115,13 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio,
>         else
>                 phy = get_phy_device(mdio, addr, is_c45);
>         if (IS_ERR(phy)) {
> -               if (mii_ts)
> -                       unregister_mii_timestamper(mii_ts);
> +               unregister_mii_timestamper(mii_ts);
>                 return PTR_ERR(phy);
>         }
>
>         rc = of_mdiobus_phy_device_register(mdio, phy, child, addr);
>         if (rc) {
> -               if (mii_ts)
> -                       unregister_mii_timestamper(mii_ts);
> +               unregister_mii_timestamper(mii_ts);
>                 phy_device_free(phy);
>                 return rc;
>         }
> diff --git a/drivers/net/phy/mii_timestamper.c b/drivers/net/phy/mii_timestamper.c
> index b71b7456462d..51ae0593a04f 100644
> --- a/drivers/net/phy/mii_timestamper.c
> +++ b/drivers/net/phy/mii_timestamper.c
> @@ -111,6 +111,9 @@ void unregister_mii_timestamper(struct mii_timestamper *mii_ts)
>         struct mii_timestamping_desc *desc;
>         struct list_head *this;
>
> +       if (!mii_ts)
> +               return;
> +
>         /* mii_timestamper statically registered by the PHY driver won't use the
>          * register_mii_timestamper() and thus don't have ->device set. Don't
>          * try to unregister these.
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index f875efe7b4d1..9c5127405d91 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -928,8 +928,7 @@ EXPORT_SYMBOL(phy_device_register);
>   */
>  void phy_device_remove(struct phy_device *phydev)
>  {
> -       if (phydev->mii_ts)
> -               unregister_mii_timestamper(phydev->mii_ts);
> +       unregister_mii_timestamper(phydev->mii_ts);
>
>         device_del(&phydev->mdio.dev);
>
> --
> 2.17.1
>


-- 
With Best Regards,
Andy Shevchenko