Public bug reported: == Comment: #0 - Michael Ranweiler <mranw...@us.ibm.com> - 2018-08-21 13:52:03 == +++ This bug was initially created as a clone of Bug #170766 +++
Please apply the following kernel patch: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=db2173198b9513f7add8009f225afa1f1c79bcc6 powerpc/powernv/pci: Work around races in PCI bridge enabling The generic code is racy when multiple children of a PCI bridge try to enable it simultaneously. This leads to drivers trying to access a device through a not-yet-enabled bridge, and this EEH errors under various circumstances when using parallel driver probing. There is work going on to fix that properly in the PCI core but it will take some time. x86 gets away with it because (outside of hotplug), the BIOS enables all the bridges at boot time. This patch does the same thing on powernv by enabling all bridges that have child devices at boot time, thus avoiding subsequent races. It's suitable for backporting to stable and distros, while the proper PCI fix will probably be significantly more invasive. Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: sta...@vger.kernel.org Signed-off-by: Michael Ellerman <m...@ellerman.id.au> == Comment: #2 - Michael Ranweiler <mranw...@us.ibm.com> - 2018-08-21 18:23:35 == This has some fuzz and also move it back from the pci macro to dev_err so we'll attach the backported patch. ** Affects: kernel-package (Ubuntu) Importance: Undecided Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Tags: architecture-ppc64le bugnameltc-170793 severity-critical targetmilestone-inin--- ** Tags added: architecture-ppc64le bugnameltc-170793 severity-critical targetmilestone-inin--- ** Changed in: ubuntu Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) ** Package changed: ubuntu => kernel-package (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1788549 Title: powerpc/powernv/pci: Work around races in PCI bridge enabling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kernel-package/+bug/1788549/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
