linux-kernel - Re: [PATCH 02/12] usb: typec: Start using ERR

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Date:   Fri, 16 Feb 2018 13:07:24 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 02/12] usb: typec: Start using ERR_PTR

On Fri, Feb 16, 2018 at 12:47 PM, Hans de Goede <hdegoede@...hat.com> wrote:
> From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>
> In order to allow the USB Type-C Class driver take care of
> things like muxes and other possible dependencies for the
> port drivers, returning ERR_PTR instead of NULL from the
> registration functions in case of failure.
>
> The reason for taking over control of the muxes for example
> is because handling them in the port drivers would be just
> boilerplate.

>  void typec_unregister_altmode(struct typec_altmode *alt)
>  {
> -       if (alt)
> -               device_unregister(&alt->dev);
> +       device_unregister(&alt->dev);
>  }

But it's a pattern to guarantee that unregister type of functions are
NULL (or ERR_PTR) aware.


>  void typec_unregister_partner(struct typec_partner *partner)
>  {
> -       if (partner)
> -               device_unregister(&partner->dev);
> +       device_unregister(&partner->dev);
>  }

Ditto.

-- 
With Best Regards,
Andy Shevchenko