Re: Null Pointer BUG in uhci_hcd

Michael S. Zick
2009-07-08T23:56:25Z

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@cb01:/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@cb01:/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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