linux-kernel - Re: [PATCH v2 13/27] thunderbolt: Read vendor and device name from DROM

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Message-ID: <CAHp75Vevv5h85GtPpx6Ss85tbaBfnnYCi7Whmi5tcz_p7Ekobg@mail.gmail.com>
Date:   Sat, 27 May 2017 18:58:22 +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 13/27] thunderbolt: Read vendor and device name from DROM

On Sat, May 27, 2017 at 6:57 PM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Fri, May 26, 2017 at 7:09 PM, Mika Westerberg
> <mika.westerberg@...ux.intel.com> wrote:
>> The device DROM contains name of the vendor and device among other
>> things. Extract this information and expose it to the userspace via two
>> new attributes.
>
>> +static const char *parse_name(const u8 *data, u8 len)
>
> Hmm... (name)
>
>> +{
>> +       char *name;
>> +
>> +       name = kmemdup(data, len, GFP_KERNEL);
>
> Since it's ASCII by specification it may make sense to use
>
> sw->..._name = kstrndup(entry->data, sizeof(*header), GFP_KERNEL);

sizeof(*header) - 1, of course.

> if (!sw->..._name)
>  return -ENOMEM;
>
> just in place, instead of this entire function.
>
>> +       if (name)
>> +               name[len - 1] = '\0';
>> +       return name;
>> +}
>> +
>> +static int tb_drom_parse_entry_generic(struct tb_switch *sw,
>> +               struct tb_drom_entry_header *header)
>> +{
>> +       const struct tb_drom_entry_generic *entry =
>> +               (const struct tb_drom_entry_generic *)header;
>> +
>> +       switch (header->index) {
>> +       case 1:
>> +               /* Length includes 2 bytes header so remove it before copy */
>> +               sw->vendor_name = parse_name(entry->data,
>> +                                            header->len - sizeof(*header));
>> +               if (!sw->vendor_name)
>> +                       return -ENOMEM;
>> +               break;
>> +
>> +       case 2:
>> +               sw->device_name = parse_name(entry->data,
>> +                                            header->len - sizeof(*header));
>> +               if (!sw->device_name)
>> +                       return -ENOMEM;
>> +               break;
>> +       }
>> +
>> +       return 0;
>> +}
>
> --
> With Best Regards,
> Andy Shevchenko



-- 
With Best Regards,
Andy Shevchenko