linux-kernel - RE: [linux-usb-devel] 2.6.17 hangs during boot on ASUS M2NPV-VM motherboard

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Message-ID: <89E85E0168AD994693B574C80EDB9C270464C9D2@uk-email.terastack.bluearc.com>
Date:	Wed, 19 Jul 2006 14:00:03 +0100
From:	"Andy Chittenden" <AChittenden@...earc.com>
To:	"Andrew Morton" <akpm@...l.org>,
	"Alan Stern" <stern@...land.harvard.edu>
Cc:	<david-b@...bell.net>, <greg@...ah.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-usb-devel@...ts.sourceforge.net>
Subject: RE: [linux-usb-devel] 2.6.17 hangs during boot on ASUS M2NPV-VM motherboard

> > On Fri, 14 Jul 2006 14:50:16 -0400 (EDT)
> > Alan Stern <stern@...land.harvard.edu> wrote:
> > 
> > > On Fri, 14 Jul 2006, Andrew Morton wrote:
> > > 
> > > > On Fri, 14 Jul 2006 16:54:25 +0100
> > > > "Andy Chittenden" <AChittenden@...earc.com> wrote:
> > > 
> > > > > > So I guess there's something awry with the USB 
> > controller driver?
> > > > > > 
> > > > > 
> > > > > Is there any other info that someone wants to track 
> > this down? Or has
> > > > > someone got a fix?
> > > 
> > > It's hard to come up with a fix without knowing what's 
> > wrong.  The current 
> > > development version of that subroutine is essentially the 
> > same as the 
> > > version in 2.6.17.
> > > 
> > > If you want to pin down the problem more precisely, try 
> > adding a whole 
> > > bunch of printk() statements to the 
> > quirk_usb_handoff_ohci() function in
> > > drivers/usb/host/pci-quirks.c.
> > > 
> > 
> > Andy, please add the below, work out what line it gets stuck 
> > at and then
> > let us know?  Thanks.
> 
> Well I did that and the kernel got a lot further! It ran 
> through the pci_init stuff without a hitch and then hung just 
> after this line was output:
> 
> ohci_hcd: 2005 April 22 USB 1.1 'Open' Host Controller (OHCI) 
> Driver (PCI)
> 
> So I littered drivers/usb/host/ohci-pci.c with similar 
> debugging and the last line it printed was from (marked with --->):
> 
> static int __init ohci_hcd_pci_init (void)
> {
>     int ret;
>         printk (KERN_DEBUG "%s: " DRIVER_INFO " (PCI)\n", hcd_name);
>         if (usb_disabled())
>                 return -ENODEV;
> 
>         D();
> 
>         pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
>                 sizeof (struct ed), sizeof (struct td));
> --->         D();
> 
>         ret = pci_register_driver (&ohci_pci_driver);
>         D();
>         return ret;
> 
> }
> 
> IE it never returned from pci_register_driver.
> 
> A bit more sprinkling of debugging showed it got to 
> drivers/base/bus.c (bus_add_driver()):
> 
>         D();
> 
>                 driver_attach(drv);
>         D();
> 
> It never returned from driver_attach().
> 
> More debugging in drivers/base/dd.c showed the last output to 
> be (marked with --->):
> 
> static int __driver_attach(struct device * dev, void * data)
> {
>         struct device_driver * drv = data;
> 
>         /*
>          * Lock device and try to bind to it. We drop the error
>          * here and always return 0, because we need to keep trying
>          * to bind to devices and some drivers will return an error
>          * simply if it didn't support the device.
>          *
>          * driver_probe_device() will spit a warning if there
>          * is an error.
>          */
> 
> --->        D();
> 
>         if (dev->parent)        /* Needed for USB */
>                 down(&dev->parent->sem);
>         D();
> 
> IE it never returned from down.
> 
> So why did putting in the initial lot of debug alter where 
> the kernel hung? And what's next?
> 
> NB a reminder: 2.6.16 boots up fine on this machine.

Any progress?

-- 
Andy, BlueArc Engineering
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