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Old 03-22-2012, 02:15 PM
Joseph Salisbury
 
Default LP:961482 Added To Kernel Team Hot List

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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
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Old 03-22-2012, 08:47 PM
Joseph Salisbury
 
Default LP:961482 Added To Kernel Team Hot List

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Hash: SHA1

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
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Old 03-22-2012, 09:54 PM
Joseph Salisbury
 
Default LP:961482 Added To Kernel Team Hot List

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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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