linux-kernel - Re: [dm-devel] [PATCH] kobject: provide kobject_put

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Date:	Mon, 6 Jan 2014 11:23:53 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Bart Van Assche <bvanassche@....org>,
	Jeff Mahoney <jeffm@...e.com>, torvalds@...ux-foundation.org,
	device-mapper development <dm-devel@...hat.com>,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: Re: [dm-devel] [PATCH] kobject: provide kobject_put_wait to fix
 module unload race

On Mon, Jan 06, 2014 at 01:55:11PM -0500, Mikulas Patocka wrote:
> 
> 
> On Sun, 5 Jan 2014, Greg Kroah-Hartman wrote:
> 
> > On Sun, Jan 05, 2014 at 05:43:56PM +0100, Bart Van Assche wrote:
> > > On 01/04/14 19:06, Mikulas Patocka wrote:
> > > > -	if (t && !t->release)
> > > > -		pr_debug("kobject: '%s' (%p): does not have a release() "
> > > > -			 "function, it is broken and must be fixed.\n",
> > > > -			 kobject_name(kobj), kobj);
> > > > -
> > > 
> > > Has it been considered to issue a warning if no release function has
> > > been defined and free_completion == NULL instead of removing the above
> > > debug message entirely ? I think even with this patch applied it is
> > > still wrong to invoke kobject_put() on an object without defining a
> > > release function.
> > 
> > This patch isn't going to be applied, and I've reverted the original
> > commit, so there shouldn't be any issues anymore with this code.
> 
> Why? This patch does the same thing as 
> eee031649707db3c9920d9498f8d03819b74fc23, but it's smaller. So why did you 
> accept eee031649707db3c9920d9498f8d03819b74fc23 and not this?

I have now reverted that commit, it will not be in 3.14, so consider it
rejected as well :)

thanks,

greg k-h
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