linux-kernel - Re: [PATCH] gpio: better lookup method for platform GPIOs

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Date:	Fri, 29 Nov 2013 08:17:15 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Rhyland Klein <rklein@...dia.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: better lookup method for platform GPIOs

> On Thu, Nov 28, 2013 at 10:46 AM, Alexandre Courbot <acourbot@...dia.com> wrote:

One missed, but not least, thing.

>> +static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev)
>>  {
>>         const char *dev_id = dev ? dev_name(dev) : NULL;
>> -       struct gpio_desc *desc = ERR_PTR(-ENODEV);
>> -       unsigned int match, best = 0;
>> -       struct gpiod_lookup *p;
>> +       struct gpiod_lookup_table *table;
>>
>>         mutex_lock(&gpio_lookup_lock);
>>
>> -       list_for_each_entry(p, &gpio_lookup_list, list) {
>> -               match = 0;
>> +       list_for_each_entry(table, &gpio_lookup_list, list) {

[]

>> +               if (dev_id != table->dev_id)
>> +                       continue;
>>
>> -                       match += 2;
>> -               }
>> +               return table;
>
> What  about
>
> if (dev_id == table->dev_id)
>  return table;
>
> ?

And unlock mutex, of course! It seems you missed this in the first place.

>
>> +       }
>>
>> -               if (p->con_id) {
>> -                       if (!con_id || strcmp(p->con_id, con_id))
>> -                               continue;
>> +       mutex_unlock(&gpio_lookup_lock);
>>
>> -                       match += 1;
>> -               }
>> +       return NULL;
>> +}

-- 
With Best Regards,
Andy Shevchenko
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