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

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Message-ID: <a8e1da0801141617x6d49a144r441404dfe06d5b35@mail.gmail.com>
Date:	Tue, 15 Jan 2008 08:17:04 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Cornelia Huck" <cornelia.huck@...ibm.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 Jan 14, 2008 8:13 PM, Cornelia Huck <cornelia.huck@...ibm.com> wrote:
> 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)...

Sounds good, will do. Thanks.

>
> > +
> > +     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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