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

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Date:	Thu, 08 Aug 2013 12:45:28 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Wei Ni <wni@...dia.com>, "khali@...ux-fr.org" <khali@...ux-fr.org>,
	Matthew Longnecker <MLongnecker@...dia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

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.

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