From mboxrd@z Thu Jan  1 00:00:00 1970
From: dk-arm-linux@gmx.de (Dieter Kiermaier)
Date: Wed, 11 Nov 2009 17:27:07 +0100
Subject: kirkwood / openrd: umount problem using mdev (busybox)
In-Reply-To: <alpine.LFD.2.00.0911111056510.16711@xanadu.home>
References: <200911061559.47922.dk-arm-linux@gmx.de>
	<200911111555.02938.dk-arm-linux@gmx.de>
	<alpine.LFD.2.00.0911111056510.16711@xanadu.home>
Message-ID: <200911111727.07952.dk-arm-linux@gmx.de>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Am Mittwoch 11 November 2009 17:11:37 schrieb Nicolas Pitre:
> On Wed, 11 Nov 2009, Dieter Kiermaier wrote:
> 
> > Hi again,
> > 
> > > Hi all,
> > > 
> > > I've encountered a new problem with regards to busybox mdev while umounting a usb pendrive:
> > > I'm using kernel
> > > sh-3.2# uname -a
> > > Linux DB88FXX81 2.6.32-rc4 #2 PREEMPT Thu Nov 5 13:41:41 CET 2009 armv5tel GNU/Linux
> > > sh-3.2#
> > > 
> > > 
> > > Mounting and umounting manually works like a charm without any problems. But if I disconnected a
> > > mounted pendrive and wants mdev to umount it on a remove event the umount call hangs until I get a
> > > message from my kernel (see below).
> > >
> > 
> > This problem also doesn't exist with marvell stock 2.6.22.18 kernel.
> > So I would assume it is no busybox problem.
> > It looks like another kernel problem with current mainline kernel?
> 
> Maybe you have misconfigured one feature in your build of the mainline 
> kernel compared to the 2.6.22 version?
> 
> In any case, given that manually mounting/unmounting does work, this 
> suggests the issue hardly can be in the USB host driver.  And everything 
> else from your kernel backtrace is generic code not specific to Kirkwood 
> or even ARM for that matter.
> 
> I'd suggest trying with the very latest kernel and repost your findings 
> (including kernel backtrace and all) to linux-kernel at vger.kernel.org and 
> CC Jens Axboe <axboe@kernel.dk> who is the block layer maintainer.
> 
> 
> Nicolas
> 
Many thanks for suggesting - I will do that.
To post at linux-kernel at vger.kernel.org is it recommended to use vanilla kernel from kernel.org or is orion.git good as well?

Dieter