Public bug reported:
The following two patches to pci-hyperv were submitted upstream but
missed getting pulled into Bjorn's tree. They are needed to fix an issue
discovered working on SR-IOV on Azure.
Patch 1: hv_pci_devices_present is called in hv_pci_remove when we
remove a PCI device from host (e.g. by disabling SRIOV on a device). In
hv_pci_remove, the bus is already removed before the call, so we don't
need to rescan the bus in the workqueue scheduled from
hv_pci_devices_present. By introducing status hv_pcibus_removed, we can
avoid this situation.
Patch 2: A PCI_EJECT message can arrive at the same time we are calling
pci_scan_child_bus in the workqueue for the previous PCI_BUS_RELATIONS
message or in create_root_hv_pci_bus(), in this case we could
potentailly modify the bus from multiple places. Properly lock the bus
access.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "0001-pci-hyperv-properly-handle-pci-bus-remove.patch"
https://bugs.launchpad.net/bugs/1665097/+attachment/4819743/+files/0001-pci-hyperv-properly-handle-pci-bus-remove.patch
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https://bugs.launchpad.net/bugs/1665097
Title:
[Hyper-V] SAUCE: pci-hyperv fixes for SR-IOV on Azure
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