linux-kernel - Re: [PATCH 1/7] driver-core : add class iteration api

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Message-ID: <20080114131347.6ddd036a@gondolin.boeblingen.de.ibm.com>
Date:	Mon, 14 Jan 2008 13:13:47 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	Greg KH <gregkh@...e.de>, stefanr@...6.in-berlin.de,
	James.Bottomley@...senpartnership.com, a.zummo@...ertech.it,
	peterz@...radead.org, cbou@...l.ru, linux-kernel@...r.kernel.org,
	David Brownell <david-b@...bell.net>, krh@...hat.com,
	stern@...land.harvard.edu, dwmw2@...radead.org,
	davem@...emloft.net, jarkao2@...il.com
Subject: Re: [PATCH 1/7] driver-core : add class iteration api

On Sat, 12 Jan 2008 17:47:54 +0800,
Dave Young <hidave.darkstar@...il.com> wrote:

Minor style suggestion (same for class_find_child):

> +struct device *class_find_device(struct class *class, void *data,
> +				   int (*match)(struct device *, void *))
> +{
> +	struct device *dev;
> +	int error = 1;

How about using inverse logic here (e.g., start with int found = 0)...

> +
> +	if (!class)
> +		return NULL;
> +
> +	down(&class->sem);
> +	list_for_each_entry(dev, &class->devices, node) {
> +		dev = get_device(dev);
> +		if (dev) {
> +			if (match(dev, data)) {
> +				error = 0;

...and set found = 1 here...

> +				break;
> +			} else
> +				put_device(dev);
> +		} else
> +			break;
> +	}
> +	up(&class->sem);
> +
> +	if (error)
> +		return NULL;
> +	return dev;

...and do
	return found ? dev : NULL;
in the end?

Especially since not finding the device is not really an error.

> +}

Otherwise this looks fine to me.
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