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    SubjectRe: Null Pointer BUG in uhci_hcd
    On Wed, 8 Jul 2009, Michael S. Zick wrote:

    > > > > > 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

    Those files all look perfectly normal. You made these copies at a time
    when everything was working, right? It will be more interesting to see
    them at a time when something isn't working.

    Alan Stern



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