linux-kernel - Re: Null Pointer BUG in uhci

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Date:	Tue, 7 Jul 2009 15:21:05 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Michael S. Zick" <lkml@...ethan.org>
cc:	Oliver Neukum <oliver@...kum.org>, Jiri Kosina <jkosina@...e.cz>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: Null Pointer BUG in uhci_hcd

On Tue, 7 Jul 2009, Michael S. Zick wrote:

> On Tue July 7 2009, Alan Stern wrote:
> > On Tue, 7 Jul 2009, Michael S. Zick wrote:
> > 
> > > > It looks like there's a serious problem in your UHCI hardware.  
> > > > According to the log you posted, it's not working at all.
> > > > 
> > > 
> > > I am using the x86-generic drivers - -
> > 
> > Not a problem with the drivers, a problem in the hardware.
> > 
> 
> Or hardware that works as the manufacturer intended, but differently
> than expected.  Same difference as "broken" when compared to "standard".

No, hardware that doesn't work at all.  As in "all reads return
0xffffffff" -- that's just a guess but something like it would account
for what you saw.

For more information enable CONFIG_USB_DEBUG and CONFIG_DEBUG_FS, then 
see what's sitting in the usb/uhci/* files in debugfs.

> Let me see if I can find it again;
> 1106:3038 translates to: PCI_DEVICE_ID_VIA_82C586_2
> 1106:3104 translates to: PCI_DEVICE_ID_VIA_8235_USB_2
> 
> The first appears in (this device is the UHCI hub in the CX700 chipset):
> arch/powerpc/platforms/85xx/mpc85xx_cds.c:              case PCI_DEVICE_ID_VIA_82C586_2:
> arch/mips/pci/fixup-lm2e.c:DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2,
> include/linux/pci_ids.h:#define PCI_DEVICE_ID_VIA_82C586_2      0x3038

Those are simple interrupt routing fixups.  Not related.

> The second appears in:
> include/linux/pci_ids.h:#define PCI_DEVICE_ID_VIA_8235_USB_2    0x3104
> <Hmm... Dead?  Not used?  Never used?  Source padding?>

Probably never used.

Alan Stern

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