linux-kernel - RE: [RFC PATCH v3 1/5] dt: add of_get_child

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Date:	Tue, 20 Dec 2011 15:58:43 -0800
From:	Stephen Warren <swarren@...dia.com>
To:	Dong Aisheng <b29396@...escale.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: RE: [RFC PATCH v3 1/5] dt: add of_get_child_count helper function

Dong Aisheng wrote at Tuesday, December 20, 2011 10:41 AM:
> From: Dong Aisheng <dong.aisheng@...aro.org>
> 
> Currently most code to get child count in kernel are almost same,
> add a helper to implement this function for dt to use.

> diff --git a/include/linux/of.h b/include/linux/of.h

> +static inline int of_get_child_count(const struct device_node *np)
> +{
> +	return -ENOSYS;
> +}

Wouldn't it be better to return 0 here? -ENOSYS would be fine if the
function returned an error code, but it's really returning a count, and
other "dummy" functions that return data return 0/NULL already. This
would also allow you to just use the value directly in all cases rather
than having to check for a < 0 error case.

-- 
nvpublic

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