Date: Mon, 15 Oct 2007 15:01:24 -0700 (PDT)
Message-Id: <20071015.150124.78710191.davem@davemloft.net>
To: david-b@pacbell.net
Cc: stern@rowland.harvard.edu, greg@kroah.com, linux-kernel@vger.kernel.org,
       linux-usb-users@lists.sourceforge.net
Subject: Re: [Linux-usb-users] OHCI root_port_reset() deadly loop...
From: David Miller <davem@davemloft.net>
In-Reply-To: <20071009.213507.78708496.davem@davemloft.net>
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	<20071009.213507.78708496.davem@davemloft.net>
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From: David Miller <davem@davemloft.net>
Date: Tue, 09 Oct 2007 21:35:07 -0700 (PDT)

> From: David Miller <davem@davemloft.net>
> Date: Tue, 09 Oct 2007 15:00:40 -0700 (PDT)
> 
> > From: David Brownell <david-b@pacbell.net>
> > Date: Tue, 9 Oct 2007 14:43:54 -0700
> > 
> > > Does it resolve the problem you observed?
> > 
> > I will definitely give the patch a try and report back.
> 
> My tests look really good with Alan Stern's patch.
> 
> With a kernel is hacked to load OHCI before EHCI, and
> that always hangs, the patch makes the hang go away
> reliably.

Bad news, even with the rwsem after a lot more testing I can still
trigger the hang in ohci_hub_control() :-(

I think we need to go back to considering the total serialization
approach to this problem.
-
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