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

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Message-ID: <4C99D436.700@panasas.com>
Date:	Wed, 22 Sep 2010 12:02:30 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Greg KH <greg@...ah.com>,
	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 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.

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)

> Kay

Thanks
Boaz
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