linux-kernel - Re: [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem

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Date:	Thu, 14 Sep 2006 16:08:45 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Andrew Morton <akpm@...l.org>, Mattia Dongili <malattia@...ux.it>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem

On Thursday, 14 September 2006 15:14, Rafael J. Wysocki wrote:
> On Wednesday, 13 September 2006 23:55, Alan Stern wrote:
> > On Wed, 13 Sep 2006, Rafael J. Wysocki wrote:
> > 
> > > > Try this patch instead.  It looks for problems occurring a little earlier 
> > > > in the call chain.
> > > 
> > > I've applied both patches at a time (I hope they don't conflict).
> > > 
> > > The dmesg output is attached.
> > 
> > The dmesg output shows the root-hub device state is set wrong.
> > 
> > I have to leave now, so I can't give you another patch to try.  You can 
> > experiment as follows...
> > 
> > Look in drivers/usb/host/ehci-pci.c, at ehci_pci_resume().  The part of 
> > interest is everything following the "restart:" statement label.
> > 
> > Try adding some ehci_dbg() lines in there (copy the form of the line just
> > after restart:).  We want to follow the value of
> > hcd->self.root_hub->state.  Initially it should be equal to
> > USB_STATE_SUSPENDED (= 8), and it shouldn't change.  But somewhere it is
> > getting set to USB_STATE_CONFIGURED (= 7).  I don't know where, but almost 
> > certainly somewhere in this routine.  If you can find out where that 
> > happens, I'd appreciate it.
> 
> Done, but it shows hcd->self.root_hub->state is already 7 right after restart.

BTW, all of the systems on which the problem shows up seem to be 64-bit.

If you can't reproduce it on a 32-bit system, some type casting may be wrong
somewhere.

Greetings,
Rafael


-- 
You never change things by fighting the existing reality.
		R. Buckminster Fuller
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