linux-kernel - Re: [PATCH v2 24/27] thunderbolt: Add support for Internal Connection Manager (ICM)

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Date:   Sun, 28 May 2017 13:13:48 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 24/27] thunderbolt: Add support for Internal Connection
 Manager (ICM)

On 5/28/17, Mika Westerberg <mika.westerberg@...ux.intel.com> wrote:
> On Sat, May 27, 2017 at 11:45:21PM +0300, Andy Shevchenko wrote:
>> On Fri, May 26, 2017 at 7:09 PM, Mika Westerberg
>> <mika.westerberg@...ux.intel.com> wrote:
>>
>> > +static inline u8 dual_link_from_link(u8 link)
>> > +{
>> > +       return link ? ((link - 1) ^ 0x01) + 1 : 0;
>> > +}
>>
>> I have got better one (IIUC):
>>
>>       return (link + 1) ^ 0x01) - 1;
>
> Unfortunately this does not work if link is 0.
>

Yeah, it needs same null check.

-- 
With Best Regards,
Andy Shevchenko