From: Keith Busch <kbusch@xxxxxxxxxx> I am working with larger pcie topologies again, and we're seeing some failures when dealing with certain overlapping pcie events. The topology is essentially this: [Root Port] <-> [UpStream Port] <-> [DownStream Port] <-> [End Device] An error between the DSP and ED triggers DPC. There's only inband presence detection so it also triggers hotplug. Before the error handling is completed, though, another error seen by the RP triggers its own DPC handling. The concurrent event handling reveals some interesting races, and this small patchset tries to address these in the low invasive way. Keith Busch (2): PCI: pciehp: fix concurrent sub-tree removal deadlock PCI: err: ensure stable topology during handling drivers/pci/hotplug/pciehp_pci.c | 12 +++++++++--- drivers/pci/pci.h | 1 + drivers/pci/pcie/err.c | 8 +++++++- drivers/pci/probe.c | 24 ++++++++++++++++++++++++ include/linux/pci.h | 2 ++ 5 files changed, 43 insertions(+), 4 deletions(-) -- 2.43.0
