linux-kernel - Re: [PATCH] driver core: delete virtual directory on class

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Message-ID: <20061121160939.7a9a1f7d@gondolin.boeblingen.de.ibm.com>
Date:	Tue, 21 Nov 2006 16:09:39 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	Greg KH <gregkh@...e.de>, Jiri Slaby <jirislaby@...il.com>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver core: delete virtual directory on
 class_unregister()

On Tue, 21 Nov 2006 18:58:53 +0900,
Akinobu Mita <akinobu.mita@...il.com> wrote:

> On Mon, Nov 20, 2006 at 12:34:40PM -0800, Greg KH wrote:
> >
> > Hm, why is this not reproducable for me then without this patch?
> >
> 
> I can reproduce it by reloading raw.ko on 2.6.19-rc5-mm2.
> not happened on 2.6.19-rc6.

I can reproduce this on 2.9.19-rc5-mm2 with CONFIG_SYSFS_DEPRECATED as
well.

> After unloading raw.ko, /sys/devices/virtual/raw is still exist.
> So next loading raw.ko will fail.

And as virtual_device_parent() fails to do much error checking, we end
up with /sys/devices/rawctl instead of /sys/devices/virtual/raw/rawctl.
raw_init() won't notice anything has gone wrong...

Perhaps it would make sense to create /sys/device/virtual/<class>/
already in class_register() (regardless of whether there will be any
devices for this class) and unconditionally remove it in
class_unregister()? Removing something in _unregister() which was not
created by _register() but by some unrelated action seems a bit
lopsided to me...

-- 
Cornelia Huck
Linux for zSeries Developer
Tel.: +49-7031-16-4837, Mail: cornelia.huck@...ibm.com
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