You have been subscribed to a public bug: == Comment: #0 - Breno Leitao <bren...@br.ibm.com> - 2018-08-23 17:52:30 == Please apply the following kernel patch into Bionic 4.15 kernel, and Xenial 4.4 kernel.
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> ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Tags: architecture-ppc64le bugnameltc-170843 severity-high targetmilestone-inin--- -- [Bionic, Xenial] powerpc/powernv/pci: Work around races in PCI bridge enabling https://bugs.launchpad.net/bugs/1788850 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
