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@xxxxxxxxxxxxxxxxxxx>: > > 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). > > > > Can you figure out exactly where the computer stops, by adding printk > > lines to the quirk_usb_handoff_ohci function? > > > > Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
