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

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Date:	Wed, 22 Sep 2010 10:53:21 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Greg KH <greg@...ah.com>
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 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.

Kay
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