Re: [PATCH v4 1/6] devres: provide devm_krealloc_array()

[Jean-Jacques Hiblot <jjhiblot@traphandler.com>]

On 07/10/2022 18:18, Andy Shevchenko wrote:
>>   {
>>          return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
>>   }
> Missed blank line?

There is no blank line after the definitions of devm_kzalloc(), 
devm_kmalloc_array() and devm_kcalloc() defined just above.

>
>> +static inline void *devm_krealloc_array(struct device *dev,
>> +                                       void *p,
>> +                                       size_t new_n,
>> +                                       size_t new_size,
>> +                                       gfp_t flags)
>> +{
>> +       size_t bytes;
>> +
>> +       if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
>> +               return NULL;
> I'm not sure it is what we want, but I have read the man realloc and found this:
>
>        ... reallocarray() fails safely in the case where the multiplication
>        would overflow.  If such an overflow occurs, reallocarray() returns NULL,
>        sets  errno  to  ENOMEM,  and leaves the original block of memory
>        unchanged.
>
> So, perhaps you can add that this behaviour mimics reallocarray()?

except for the errno part, that is what is does. I don't think we should 
use ERR_PTR in this case as the other allocation functions don't use it.

>
>> +       return devm_krealloc(dev, p, bytes, flags);
>> +}
> ...
>
> All comments are minor, feel free to add
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
>