linux-kernel - Re: [PATCH 04/14] memstick: core: fix device

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Message-ID: <20100922155004.GC26178@kroah.com>
Date:	Wed, 22 Sep 2010 08:50:04 -0700
From:	Greg KH <greg@...ah.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vasiliy Kulikov <segooon@...il.com>,
	kernel-janitors@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...e.de>,
	Dan Carpenter <error27@...il.com>,
	Boaz Harrosh <bharrosh@...asas.com>
Subject: Re: [PATCH 04/14] memstick: core: fix device_register() error
 handling

On Wed, Sep 22, 2010 at 10:53:21AM +0200, Kay Sievers wrote:
> On Wed, Sep 22, 2010 at 00:49, Greg KH <greg@...ah.com> wrote:
> 
> >  int device_register(struct device *dev)
> >  {
> > +       int retval;
> > +
> >        device_initialize(dev);
> > -       return device_add(dev);
> > +       retval = device_add(dev);
> > +       if (retval)
> > +               put_device(dev);
> > +       return retval;
> >  }
> 
> > Kay, what am I missing here, why can't we just do this?  Hm, the
> > side-affect might be that if device_register() fails, NO ONE had better
> > touch that device again, as it might have just been freed from the
> > system.  I wonder if that will cause problems...
> 
> That looks right, besides that there might be callers already doing
> this. Which needs to be checked.

Yes, it would be.  I'll go through the tree.

> I never liked this pretty useless "convenience API", which just wraps
> two simple functions and the first one can never fail anyway.

Agreed.

> We better remove that device_register() stuff entirely in the long
> run, it's not doing any good. At the kobject level we killed the same
> stuff already long ago.

It's one of the things on my "to change" list.

thanks,

greg k-h
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