linux-kernel - Re: [PATCH 0/3] firmware: Fix usermodehelper deadlock at shutdown

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Date:	Wed, 08 May 2013 18:26:56 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 0/3] firmware: Fix usermodehelper deadlock at shutdown

At Thu, 9 May 2013 00:07:17 +0800,
Ming Lei wrote:
> 
> Hi Takashi,
> 
> Sorry for not CC list.
> 
> On Wed, May 8, 2013 at 2:56 PM, Takashi Iwai <tiwai@...e.de> wrote:
> > Hi,
> >
> > this is a series of patches for the issue we faced in the firmware
> > loader code during debugging the problem with dell_rbu driver with
> > 3.9 kernel.
> >
> > The original problem was that the shutdown gets stuck when DELL BIOS
> > update is performed.  This turned out to be a problem in the firmware
> > loader.  Although the reason of dell_rbu driver breakage is still
> 
> Sorry, from these patchset, I can't see why it is a problem in firmware.
> 
> > unclear, we should fix the firmware loader side, at least, not to
> > stall during shutdown.
> 
> Firstly you need to describe what/why is the stall? In fact, firmware
> loading can't stall forever and it will timeout, but the current 60sec
> timeout might be too long.

The timeout check is activated only when uevent flag is set, and
dell_rbu driver doesn't set it explicitly (because it's not supposed
to be handled via udev or whatever).


Takashi
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