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SubjectRe: Regression causes a hang on boot with a Comtrol PCI card
On Mon, 1 Apr 2019, Bjorn Helgaas wrote:

> [+cc Mathias, Greg, Alan, linux-usb]
>
> Beginning of thread: https://lore.kernel.org/linux-pci/CANSNSoWiKd98Dt1N2sSjP9Af8zk1NPV-=3P4VLtFs_cSQG4RUg@mail.gmail.com
>
> Synopsis: v5.0 hangs at boot unless the following commits are reverted:
>
> 1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones")
> 1c3c5eab1715 ("sched/core: Enable might_sleep() and smp_processor_id() checks early")
>
> The hang appears to be in quirk_usb_early_handoff(). With
> "initcall_debug", we see the call but not the completion:
>
> On Fri, Mar 22, 2019 at 03:02:11PM -0500, Jesse Hathaway wrote:
> > > So apparently the hang happens while we're running the "final" PCI
> > > fixups. This happens after all the rest of PCI is initialized.
> > >
> > > Can you boot v5.0 vanilla with "initcall_debug"? Maybe we can narrow
> > > it down to a specific quirk.
> >
> > yup, added the "initcall_debug" output to the ticket:
> > https://bugzilla.kernel.org/show_bug.cgi?id=202927, here is the tail end
> >
> > [ 14.896337] NET: Registered protocol family 1
> > [ 14.901314] initcall af_unix_init+0x0/0x4e returned 0 after 4866 usecs
> > [ 14.908694] calling ipv6_offload_init+0x0/0x7f @ 1
> > [ 14.914238] initcall ipv6_offload_init+0x0/0x7f returned 0 after 1 usecs
> > [ 14.921821] calling vlan_offload_init+0x0/0x20 @ 1
> > [ 14.927365] initcall vlan_offload_init+0x0/0x20 returned 0 after 0 usecs
> > [ 14.934948] calling pci_apply_final_quirks+0x0/0x126 @ 1
> > [ 14.941106] pci 0000:00:1a.0: calling quirk_usb_early_handoff+0x0/0x6a0 @ 1
> >
> > thanks, Jesse Hathaway

Most likely the problem occurs somewhere inside
quirk_usb_handoff_xhci(). Can Jesse add debugging statements to that
routine in order to pin down exactly where the problem lies?

Alan Stern

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