linux-kernel - Re: Null Pointer BUG in uhci

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Date:	Tue, 7 Jul 2009 12:56:32 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Alan Stern <stern@...land.harvard.edu>
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 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".

>
> > There are VIA-device specific drivers in other arch trees,
> > (arm?, powerpc?) - I haven't compared them to the x86-generic
> > to see if they had to do something specific for 1106:3038, 1106:3104
> > 
> > Any idea if those drivers are "long dead" or still in use?
> 
> I don't know what drivers you're talking about.
> 

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

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?>

Not including any sources that may be hardcoded rather than use the defines.

Mike
> Alan Stern
> 
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