linux-kernel - Re: [PATCH 0/7] convert semaphore to mutex in struct class

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Date:	Fri, 11 Jan 2008 10:18:24 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Stefan Richter" <stefanr@...6.in-berlin.de>
Cc:	"Greg KH" <gregkh@...e.de>, James.Bottomley@...senpartnership.com,
	linux-scsi@...r.kernel.org, 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, rtc-linux@...glegroups.com,
	spi-devel-general@...ts.sourceforge.net,
	linux1394-devel@...ts.sourceforge.net, dwmw2@...radead.org,
	davem@...emloft.net, jarkao2@...il.com
Subject: Re: [PATCH 0/7] convert semaphore to mutex in struct class

On Jan 10, 2008 8:34 PM, Stefan Richter <stefanr@...6.in-berlin.de> wrote:
> Dave Young wrote:
> > This is the first one of the series about driver core changes.
>
> Please always provide kerneldoc comments when you add new API elements;
> here: exported functions.
>
> It's unfortunate that the driver core's API isn't fully documented yet,
> and you shouldn't make it worse.
>
> That's only my personal opinion as one API user though.  But others
> might agree.  Among else, things worth documenting are return values
> after errors, side effects (!), constraints on the calling context if
> there are any special constraints.
>
> I assume you didn't write documentation yet because you need general
> feedback first.

Yes, I did not. Thanks for pointing out, I will do.
>
> ...
> > +struct device *class_find_device(struct class *class, void *data,
> > +                                int (*match)(struct device *, void *))
> > +{
> > +     struct device *dev;
> > +
> > +     if (!class)
> > +             return NULL;
> > +
> > +     mutex_lock(&class->mutex);
> > +     list_for_each_entry(dev, &class->devices, node)
> > +             if (match(dev, data) && get_device(dev))
> > +                     break;
> > +     mutex_unlock(&class->mutex);
> > +
> > +     return dev;
> > +}
>
> What is returned if there was no match?
> What if there was a match but get_ failed?

Will fix it.
>
> ...
> > +struct class_device *class_find_child(struct class *class, void *data,
> > +                                int (*match)(struct class_device *, void *))
> > +{
> ...
> > +     mutex_lock(&class->mutex);
> > +     list_for_each_entry(dev, &class->children, node)
> > +             if (match(dev, data) && class_device_get(dev))
> > +                     break;
> > +     mutex_unlock(&class->mutex);
> > +
> > +     return dev;
> > +}
>
> Here too?

Will fix it.
>
> --
> Stefan Richter
> -=====-==--- ---= -=-=-
> http://arcgraph.de/sr/
>
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