Re: [Bug 219906] New: Kernel Oops in pcie_update_link_speed when hotplugging TB4 dock on x870e / kernel 6.14.0-rc7

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On Fri, Mar 21, 2025 at 02:15:04PM -0500, Bjorn Helgaas wrote:
> On Fri, Mar 21, 2025 at 06:30:40PM +0000, bugzilla-daemon@xxxxxxxxxx wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=219906
> > 
> >             Bug ID: 219906
> >            Summary: Kernel Oops in pcie_update_link_speed when hotplugging
> >                     TB4 dock on x870e / kernel 6.14.0-rc7
> 
> Do you know whether this is a regression?  Does any kernel work
> correctly on the system in question?

This is a regression caused by

    commit 665745f274870c921020f610e2c99a3b1613519b
    Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
    Date:   Fri Oct 18 17:47:52 2024 +0300

    PCI/bwctrl: Re-add BW notification portdrv as PCIe BW controller

which went into v6.13-rc1.  It can be overcome by duplicating

    commit 62e4492c3063048a163d238cd1734273f2fc757d
    Author: Andreas Noever <andreas.noever@xxxxxxxxx>
    Date:   Mon Jun 9 23:03:32 2014 +0200

    PCI: Prevent NULL dereference during pciehp probe

in the bandwidth controller driver.

I can submit a patch tomorrow unless you or Ilpo beat me to it.
(Sorry, I'm still a little sleep deprived today after OSPM Summit.)

Thanks,

Lukas




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