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

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Date:	Wed, 22 Sep 2010 08:47:46 -0700
From:	Greg KH <greg@...ah.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	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>
Subject: Re: [PATCH 04/14] memstick: core: fix device_register() error
 handling

On Wed, Sep 22, 2010 at 12:02:30PM +0200, Boaz Harrosh wrote:
> On 09/22/2010 10:53 AM, 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.
> > 
> > I never liked this pretty useless "convenience API", which just wraps
> > two simple functions and the first one can never fail anyway.
> > 
> > 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.
> > 
> 
> That would be fine, and ping me when you do it, I'll help with my
> driver. But don't forget to let us have a way to embed a device inside
> a bigger structure.

That's what you should be doing anyway, so it shouldn't be a problem.

> For meanwhile Please check the patch James sent to add_device that cleans
> up the allocation of the kobj.name member. (And the comment made there)

See my other email why that isn't a good idea.

thanks,

greg k-h
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