Re: PROBLEM: OHCI HCD - computer freezes during boot

[Bjorn Helgaas <bhelgaas@google.com>]

On Wed, Apr 11, 2012 at 1:38 PM, Alan Stern <stern@rowland.harvard.edu> wrote:
> On Wed, 11 Apr 2012, Calin Demian wrote:
>
>> Hi!
>> Yes, in fact I did allready follow the execution, and it looks like this:
>> function                                file
>> pci_apply_final_quirks           /drivers/pci/quirks.c
>> pci_fixup_device                    ~
>> pci_do_fixups                        ~
>> here, for the ohci busses 2 functions are called:
>>   nv_msi_ht_cap_quirk_all       /drivers/usb/host/pci-quirks.c
>
> What is that?  It's not present in my copy of the kernel source.
>
>>   quirk_usb_early_handoff        ~
>> quirk_usb_early_handoff calls the following 3 functions:
>>   pci_enable_device(pdev)         /drivers/pci/pci.c
>>   quirk_usb_handoff_ohci(pdev)    /drivers/usb/host/pci-quirks.c
>>   pci_disable_device(pdev)
>>
>> The execution stops inside pci_disable_device, but because
>> quirk_usb_handoff_ohci is the only function that has changed between
>> versions 3.0.13 and 3.0.20 from the list of files mentioned above, it
>> seems that this function changed behaviour in a way that my computer
>> doesn't like.
>
> That cannot be right.  The call to pci_disable_device was added after
> the change to quirk_usb_handoff_ohci.
>
>>   Further trace:
>>   pci_disable_device
>>     do_pci_disable_device
>>       pci_read_config_word
>
> I have no idea why your computer would crash inside or after
> pci_read_config_word.
>
> Anyway, this is a PCI problem, not a USB problem.  Maybe the PCI
> experts can help.  I have CC'ed the linux-pci mailing list.
>
> Alan Stern
>
>> with respect,
>> Calin Demian
>>
>>
>> 2012/4/11 Alan Stern <stern@rowland.harvard.edu>:
>> > On Wed, 11 Apr 2012, Calin Demian wrote:
>> >
>> >> 1.Boot problem: computer stops responding during boot.
>> >>
>> >> 2.The symptom doesn't occur allways, but when it does, it is at the
>> >> same point during the boot process. The last messages displayed differ
>> >> between different kernel versions, but are the same each time.
>> >>   I would appreciate if you could take a look at function
>> >> "quirk_usb_handoff_ohci" in file /drivers/usb/host/pci-quirks.c -
>> >> which was modified in version 3.0.17 of the mainline kernel. The
>> >> problem appeared when upgrading Ubuntu from mainline kernel version
>> >> 3.0.13 to version 3.0.20. Searching the changelogs I found that this
>> >> function was modified between the two releases. The  computer freezes
>> >> durin applying the quirks (pci_apply_final_quirks) for bus
>> >> 0000:00:13.1 (the 2nd OHCI bus). Controller is ALI  (EHCI 8 ports +
>> >> OHCI 3x3 ports), dev_id 5237(OHCI).

It sounds like this is a regression between 3.0.13 and 3.0.20.  Can
you please open a bug report here:

https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers&component=PCI

and attach dmesg or serial console logs with "debug ignore_loglevel
initcall_debug" for both kernels?  For 3.0.20 you probably can't get a
dmesg log because of the hang, so a digital photo would be fine, too.

Thanks,
  Bjorn