linux-kernel - Re: [PATCH] kobject: name reference should not be lost when lack of memory error happens

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Message-ID: <20101009183231.GA10094@kroah.com>
Date:	Sat, 9 Oct 2010 11:32:31 -0700
From:	Greg KH <greg@...ah.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Roman Tereshonkov <roman.tereshonkov@...ia.com>,
	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: [PATCH] kobject: name reference should not be lost when lack
	of memory error happens

On Sat, Oct 09, 2010 at 04:32:44PM +0200, Kay Sievers wrote:
> On Thu, Oct 7, 2010 at 19:53, Greg KH <greg@...ah.com> wrote:
> > On Thu, Oct 07, 2010 at 01:32:53PM +0300, Roman Tereshonkov wrote:
> >> If lack of memory error happens we must restore the old kobject name reference
> >
> > No, we can't do that, as the caller will not be expecting that to have
> > happened, right Kay?
> >
> > I think the code as-is is correct, your kobject is in an unknown state
> > and can't be used anymore.
> 
> Yeah, we've been there several times already with no clear decision so far.
> 
> Trying to set a kobject name twice seems like a serious bug.
> 
> We should kill the old_name logic, and add a WARN() when kobj->name is
> already set when the function is called, I think.

Agreed, it will be interesting to see what is trying to do this :)

thanks,

greg k-h
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