linux-kernel - Re: [Linux-usb-users] OHCI root_port

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Message-Id: <20071015.150124.78710191.davem@davemloft.net>
Date:	Mon, 15 Oct 2007 15:01:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	david-b@...bell.net
Cc:	stern@...land.harvard.edu, greg@...ah.com,
	linux-kernel@...r.kernel.org, linux-usb-users@...ts.sourceforge.net
Subject: Re: [Linux-usb-users] OHCI root_port_reset() deadly loop...

From: David Miller <davem@...emloft.net>
Date: Tue, 09 Oct 2007 21:35:07 -0700 (PDT)

> From: David Miller <davem@...emloft.net>
> Date: Tue, 09 Oct 2007 15:00:40 -0700 (PDT)
> 
> > From: David Brownell <david-b@...bell.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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