Messages in this thread |  | | | Date | Fri, 17 Oct 2008 08:20:45 -0700 | | From | Jeremy Fitzhardinge <> | | Subject | Re: Oops in UHCI when encountering "host controller process error" |
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Alan Stern wrote: >> ------------[ cut here ]------------ >> WARNING: at /home/jeremy/hg/xen/paravirt/linux/drivers/usb/host/uhci-q.c:1744 uhci_scan_schedule+0xb7/0x9a3() >> uhci->skelqh[1]->node.next is NULL >> > > Odd. Is skelqh[1] the only entry whose node.next is NULL? Not > skelqh[2] or others? >
No, the others too, but all the WARN_ON backtraces got very verbose and I had to rush home at the end of the day.
> The node is initialized during uhci_start() in uhci-hcd.c -- there's a > loop which initializes all the uhci->skelqh[i] entries by calling > uhci_alloc_qh(). You should check inside that loop to see whether > uhci->skelqh[i]->node.next is NULL to begin with. If it is then > something about the DMA-coherent memory is funny; if not then the > linked list pointer gets corrupted somewhere. >
OK, will check it out.
J
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