Public bug reported:
[Impact]
The typo in the original code led to the PCI_EXP_LNKCTL register values being
swapped between the parent PCI device and its child device.
It may lead to incorrect power state, device malfunction on system resume, or
potential data loss or system stability issues.
[Fix]
Kaiheng submitted a patch to fix the issue and has been included in v6.9
mainline kernel.
f3d049b35b01 PCI/ASPM: Restore parent state to parent, child state to child
[Test]
There is no test cases for the issue now.
[Where problems may occur]
It fixes the typo and should not introduce any regression.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: linux (Ubuntu Noble)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Affects: linux (Ubuntu Oracular)
Importance: Undecided
Status: Fix Released
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Oracular)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Oracular)
Status: New => Fix Released
** Changed in: linux (Ubuntu Noble)
Status: New => In Progress
** Changed in: linux (Ubuntu Noble)
Assignee: (unassigned) => AceLan Kao (acelankao)
** Description changed:
[Impact]
+ The typo in the original code led to the PCI_EXP_LNKCTL register values being
swapped between the parent PCI device and its child device.
+ It may lead to incorrect power state, device malfunction on system resume, or
potential data loss or system stability issues.
[Fix]
+ Kaiheng submitted a patch to fix the issue and has been included in v6.9
mainline kernel.
[Test]
+ There is no test cases for the issue now.
[Where problems may occur]
+ It fixes the typo and should not introduce any regression.
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https://bugs.launchpad.net/bugs/2071889
Title:
a critical typo in the code managing the ASPM settings for PCI
Express devices
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2071889/+subscriptions
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