[REGRESSION][PRECISE] LP:961482 Added To Kernel Team Hot List

Joseph Salisbury joseph.salisbury at canonical.com
Thu Mar 22 22:54:07 UTC 2012


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On 03/22/2012 05:47 PM, Joseph Salisbury wrote:
> On 03/22/2012 11:15 AM, Joseph Salisbury wrote:
>> Hello,
> 
>> I've added the following bug to the Kernel Team Hot List:
>> LP:961482[0]
> 
>> 	* This is a regression between 3.2.0-18 and 3.2.0-19 that prevents the
>> system from booting.
>> 	* One duplicate so far.
>> 	* I'll kick of a bisect to try and identify the offending commit.
> 
>> If anyone has some free cycles, it would be great if this bug could be
>> reviewed.
> 
>> Thanks,
> 
>> Joe
> 
> 
> 
> 
>> [0] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/961482
> 
> 
> 
> 
> Some bisecting and testing was performed.  The bad commit which caused
> this regression appears to be:
> 
> 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.  There has already been some discussion on this commit
> upstream[0], and I reported this bug upstream as well[1].
> 
> Thanks,
> 
> Joe
> 
> [0] https://lkml.org/lkml/2012/3/19/408
> [1] https://lkml.org/lkml/2012/3/22/384
> 

On addition note, GKH states that commit fixes other issues[0], so a
simple revert may not be possible.

[0] https://lkml.org/lkml/2012/3/22/392
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