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    SubjectRe: Null Pointer BUG in uhci_hcd
    Date
    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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