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

On Thu, Aug 08, 2013 at 11:33:13AM -0600, Stephen Warren wrote:

On 08/08/2013 05:23 AM, Guenter Roeck wrote:

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On 08/08/2013 02:47 AM, Wei Ni wrote:

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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.

Guenter

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