linux-kernel - Re: [Consult] Why need we call device_remove_file() firstly before call device

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Date:	Sun, 19 May 2013 18:45:06 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Ming Lei <tom.leiming@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Consult] Why need we call device_remove_file() firstly before
 call device_unregister() ?

On Mon, May 20, 2013 at 09:03:27AM +0800, Chen Gang wrote:
> On 05/18/2013 07:06 PM, Ming Lei wrote:
> > Hi,
> > 
> > On Fri, May 17, 2013 at 1:43 PM, Chen Gang <gang.chen@...anux.com> wrote:
> >> Hello All:
> >>
> >> I searched 'arch/*' and 'drivers/*' sub-directory, all of them are 'obey
> >> this rule', even in device_unregister() itself, it also firstly calls
> >> device_remove_file(), then call kobject_del().
> >>
> >> But after read the related code (fs/sysfs/*, drivers/base/core.c), it
> >> seems kobject_del() -> sysfs_remove_dir() which will release all related
> >> things (can instead of device_remove_file()).
> >>
> >> So in fact, we need not call device_remove_file() before call
> >> device_unregister(), is it correct ?
> > 
> > Looks it is correct but it is a bit implicit.
> > 
> 
> If really no other members reply within a week, we should treat your
> opinion (or suggestion) as the final result conclusion within
> linux-kernel@...r.kernel.org.  :-)

I have no idea what you mean by this.

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