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

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Date:	Thu, 08 Aug 2013 11:33:13 -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 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.
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