linux-kernel - Re: [PATCH v7 2/2] drivers: soc: Add LLCC driver

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Date:   Tue, 22 May 2018 23:46:07 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc:     linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm@...ts.infradead.org, tsoni@...eaurora.org,
        ckadabi@...eaurora.org, Evan Green <evgreen@...omium.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v7 2/2] drivers: soc: Add LLCC driver

On Tue, May 22, 2018 at 11:40 PM,  <rishabhb@...eaurora.org> wrote:
> On 2018-05-22 12:38, Andy Shevchenko wrote:
>> On Tue, May 22, 2018 at 9:33 PM,  <rishabhb@...eaurora.org> wrote:
>>> On 2018-05-18 14:01, Andy Shevchenko wrote:

>>>>> +struct llcc_slice_desc *llcc_slice_getd(u32 uid)
>>>>> +{
>>>>> +       const struct llcc_slice_config *cfg;
>>>>> +       struct llcc_slice_desc *desc;
>>>>> +       u32 sz, count = 0;
>>>>> +
>>>>> +       cfg = drv_data->cfg;
>>>>> +       sz = drv_data->cfg_size;
>>>>> +
>>>>
>>>>
>>>>
>>>>> +       while (cfg && count < sz) {
>>>>> +               if (cfg->usecase_id == uid)
>>>>> +                       break;
>>>>> +               cfg++;
>>>>> +               count++;
>>>>> +       }
>>>>> +       if (cfg == NULL || count == sz)
>>>>> +               return ERR_PTR(-ENODEV);

>>>> if (!cfg)
>>>>           return ERR_PTR(-ENODEV);
>>>>
>>>> while (cfg->... != uid) {
>>>>   cfg++;
>>>>   count++;
>>>> }
>>>>
>>>> if (count == sz)
>>>>  return ...
>>>>
>>>> Though I would rather put it to for () loop.
>>>>
>>> In each while loop iteration the cfg pointer needs to be checked for
>>> NULL. What if the usecase id never matches the uid passed by client
>>> and we keep iterating. At some point it will crash.

>> do {
>>   if (!cfg || count == sz)
>>    return ...(-ENODEV);
>>  ...
>> } while (...);
>>
>> Though, as I said for-loop will look slightly better I think.
>
> Is this fine?
> for (count = 0; count < sz; count++) {
>    if (!cfg)
>         return ERR_PTR(-ENODEV);
>    if (cfg->usecase_id == uid)
>         break;
>    cfg++;
> }
> if (count == sz)
>    return ERR_PTR(-ENODEV);

for (count = 0; cfg && count < sz; count++, cfg++)
 if (_id == uid)
  break;

if (!cfg || count == sz)
    return ERR_PTR(-ENODEV);

Simpler ?

-- 
With Best Regards,
Andy Shevchenko