Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

[Stephen Warren <swarren@wwwdotorg.org>]

On 08/08/2013 11:59 AM, Guenter Roeck wrote:
> On Thu, Aug 08, 2013 at 11:33:13AM -0600, Stephen Warren wrote:
>> On 08/08/2013 05:23 AM, Guenter Roeck wrote:
>>> On 08/08/2013 02:47 AM, Wei Ni wrote:
>> ...
>>>> I think get_regulator() will return error values, not only
>>>> -EPROBE_DEFER, so we should set data->lm90_reg to NULL to handle other
>>>> error values.
>>>>
>>> Matter of opinion if you want to check for IS_ERR or NULL later on.
>>
>> No, if regulator returns either:
>>
>> * Something valid
>> * Someting IS_ERR()
>>
>> ... then everywhere has to check the value using IS_ERR().
>>
>> If regulator returns either:
>>
>> * Something valid
>> * Someting NULL
>>
>> ... then everywhere has to check the value against NULL.
>>
> Other drivers calling get_regulator() don't check against NULL,
> so it should not be needed here either.

Right I should have mentioned that I believe regulator falls into the
first valid-or-IS_ERR case, and not the second valid-or-NULL case.