linux-kernel - Re: [PATCH] pktcdvd : add kobject

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Date:	Tue, 4 Dec 2007 09:45:06 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Dave Young" <hidave.darkstar@...il.com>
Cc:	petero2@...ia.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pktcdvd : add kobject_put when kobject register fails

Hi Dave,

On Dec 4, 2007 3:31 AM, Dave Young <hidave.darkstar@...il.com> wrote:
> Kobject_put should be called when kobject register functioin fails, so the
> the kobj ref count touch zero and then the proper cleanup routines will be
> called.

[snip]

> diff -upr linux/drivers/block/pktcdvd.c linux.new/drivers/block/pktcdvd.c
> --- linux/drivers/block/pktcdvd.c       2007-11-30 13:13:44.000000000 +0800
> +++ linux.new/drivers/block/pktcdvd.c   2007-11-30 13:24:08.000000000 +0800
> @@ -117,8 +117,10 @@ static struct pktcdvd_kobj* pkt_kobj_cre
>         p->kobj.parent = parent;
>         p->kobj.ktype = ktype;
>         p->pd = pd;
> -       if (kobject_register(&p->kobj) != 0)
> +       if (kobject_register(&p->kobj) != 0) {
> +               kobject_put(&p->kobj);
>                 return NULL;

This looks wrong to me. AFAICT the only thing that can fail
kobject_register() is kobject_add() and it cleans up after itself. Am
I missing something here?

                           Pekka
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