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    SubjectRe: Regression introduced in v3.2.12 stable
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    On 03/22/2012 05:26 PM, Greg KH wrote:
    > On Thu, Mar 22, 2012 at 03:15:03PM -0400, Joseph Salisbury wrote:
    >> I figured I'd send a heads up regarding a possible regression in v3.2.12
    >> stable. The issue prevents systems from booting.
    >>
    >> There have been a few bugs[0] reported against the Ubuntu kernel, which
    >> was recently rebased to 3.2.12. We're in the process of bisecting now
    >> and will post an update..
    >
    > What specifically happens here when the system does not boot? Any error
    > message? Are you sure this isn't the known pci express issue showing up
    > here?
    >
    > Can you run 'git bisect' to trace it down to a specific patch please?
    >
    > thanks,
    >
    > greg k-h

    Hi Greg,

    Thanks for the response.

    We did some bisecting/testing and identified the bad commit in 3.2.12 as
    the following:

    f043ddb60c84ea64a23b755004572afe922e653c PCI: ignore pre-1.1 ASPM
    quirking when ASPM is disabled
    diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
    index 1cfbf22..24f049e 100644
    - --- a/drivers/pci/pcie/aspm.c
    +++ b/drivers/pci/pcie/aspm.c
    @@ -500,6 +500,9 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
    int pos;
    u32 reg32;

    + if (aspm_disabled)
    + return 0;
    +
    /*
    * Some functions in a slot might not all be PCIe functions,
    * very strange. Disable ASPM for the whole slot

    Building a test kernel with this commit reverted allows the machines to
    boot. I see there has already been some discussion on this commit[0]

    Thanks,

    Joe

    [0] https://lkml.org/lkml/2012/3/19/408
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