linux-kernel - Re: Null Pointer BUG in uhci

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Date:	Wed, 8 Jul 2009 18:56:09 -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 Wed July 8 2009, Alan Stern wrote:
> On Wed, 8 Jul 2009, Michael S. Zick wrote:
> 
> > But, then again, we might just get lucky:
> > ehci_hcd 0000:00:10.4: Unlink after no-IRQ?  Controller is probably using the wrong IRQ.
> > usb 1-5: khubd timed out on ep0in len=18/64
> 
> Like I've been telling you all along, the hardware isn't working.  I 
> suspect it's worse than a simple interrupt-routing mistake.
> 
> > > > For more information enable CONFIG_USB_DEBUG and CONFIG_DEBUG_FS, then 
> > > > see what's sitting in the usb/uhci/* files in debugfs.
> > > > 
> > 
> > Anything in particular to look for/at?
> 
> Just post the contents of those files.
>
Done:

root@...1:/sys/kernel/debug/uhci# cat *
Root-hub state: suspended   FSBR: 0
HC status
  usbcmd    =     0048   Maxp32 CF EGSM
  usbstat   =     0020   HCHalted
  usbint    =     0002
  usbfrnum  =   (1)4a8
  flbaseadd = 19c7f000
  sof       =       40
  stat1     =     0480   OverCurrent
  stat2     =     0480   OverCurrent
Most recent frame: 52a (298)   Last ISO frame: 52a (298)
Periodic load table
        0       0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
Total: 0, #INT: 0, #ISO: 0
Root-hub state: suspended   FSBR: 0
HC status
  usbcmd    =     0048   Maxp32 CF EGSM
  usbstat   =     0020   HCHalted
  usbint    =     0002
  usbfrnum  =   (1)4a0
  flbaseadd = 19c63000
  sof       =       40
  stat1     =     0480   OverCurrent
  stat2     =     0480   OverCurrent
Most recent frame: 528 (296)   Last ISO frame: 528 (296)
Periodic load table
        0       0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
Total: 0, #INT: 0, #ISO: 0
Root-hub state: running   FSBR: 0
HC status
  usbcmd    =     00c1   Maxp64 CF RS
  usbstat   =     0000
  usbint    =     000f
  usbfrnum  =   (0)c1c
  flbaseadd = 19c9c000
  sof       =       40
  stat1     =     0495   OverCurrent Enabled Connected
  stat2     =     0495   OverCurrent Enabled Connected
Most recent frame: 56aee (750)   Last ISO frame: 56aee (750)
Periodic load table
        0       0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
        17      0       0       0       0       0       0       0
        0       0       0       0       0       0       0       0
Total: 17, #INT: 1, #ISO: 0

And, at no extra cost:

root@...1:/sys/kernel/debug/ehci/0000:00:10.4# cat *
size = 256
bus pci, device 0000:00:10.4
EHCI Host Controller
EHCI 1.00, hcd state 4
ownership 01000001 linux
SMI sts/enable 0xe00f0000
structural params 0x00103206
capability params 0x00006872
status 100f Halt FLR PCD ERR INT
command 010008 (park)=0 ithresh=1 period=256 HALT
intrenable 37 IAA FATAL PCD ERR INT
uframe 14db
port 1 status 701000 POWER sig=se0
port 2 status 701000 POWER sig=se0
port 3 status 701000 POWER sig=se0
port 4 status 701000 POWER sig=se0
port 5 status 703802 POWER OWNER sig=j CSC
port 6 status 703802 POWER OWNER sig=j CSC
irq normal 0 err 0 reclaim 0 (lost 20)
complete 0 unlink 20

Mike 
> Alan Stern
> 
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