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

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Date:   Fri, 16 Feb 2018 12:21:42 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.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

Hi,

On 16-02-18 12:07, Andy Shevchenko wrote:
> 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.

Agreed this needs an if (!IS_ERR_OR_NULL()), will fix for v2.

Regards,

Hans

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