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

From: [email-masked] (Stephen Warren)
Date: Thu, 08 Aug 2013 11:33:13 -0600

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.

checking against both IS_ERR() and NULL shouldn't ever happen, and
likewise IS_ERR_OR_NULL() is deprecated.