This is what happens when you insert a fatal error to a hotplug slot. See multiple link up/down messages. /_#_[__333.699731]_pcieport_0001:00:00.0:_AER:_Uncorrected_(Fatal)_error_received:_id=0000 [ 333.748116] pcieport 0001:00:00.0: PCIe Bus Error: severity=Uncorrected (Fatal), type=Transaction Layer, id [ 333.816044] pcieport 0001:00:00.0: device [17cb:0404] error status/mask=00040000/00400000 [ 333.871581] pcieport 0001:00:00.0: [18] Malformed TLP (First) [ 333.914675] pcieport 0001:00:00.0: TLP Header: 40000001 000000ff 00000000 00000000 [ 333.968397] pciehp 0001:00:00.0:pcie004: Slot(2): Link Down [ 334.043234] iommu: Removing device 0001:01:00.4 from group 0 [ 334.095952] iommu: Removing device 0001:01:00.3 from group 0 [ 334.144644] iommu: Removing device 0001:01:00.2 from group 0 [ 334.194653] iommu: Removing device 0001:01:00.1 from group 0 [ 334.243564] pciehp 0001:00:00.0:pcie004: Slot(2): Link Up [ 334.282556] iommu: Removing device 0001:01:00.0 from group 0 [ 334.330994] pciehp 0001:00:00.0:pcie004: Slot(2): Link Up event queued; currently getting powered off [ 334.890587] pciehp 0001:00:00.0:pcie004: Timeout on hotplug command 0x13f1 (issued 282900 msec ago) [ 335.070190] pciehp 0001:00:00.0:pcie004: Slot(2): Link Down [ 335.106960] pciehp 0001:00:00.0:pcie004: Slot(2): Link Down event queued; currently getting powered on [ 335.191119] pcieport 0001:00:00.0: AER: Device recovery failed [ 346.590153] pciehp 0001:00:00.0:pcie004: Timeout on hotplug command 0x17f1 (issued 10250 msec ago) Since DPC/AER patch to refactor fatal error handling, both hotplug driver and AER/DPC driver will try removing devices and perform enumeration on link events/AER events. Perfect environment for race condition without a change. Try to mask hotplug interrupts during AER/DPC fatal error handling. Changes from v4: * add mask_irq() and unmask_irq() callbacks to struct pcie_driver * refactor reset_slot() to use pciehp_mask_irq() an pciehp_unmask_irq() Sinan Kaya (3): PCI: pciehp: implement mask and unmask interrupt functions PCI: pciehp: reuse pciehp_mask/unmask_irq() in reset_slot() PCI: Mask and unmask hotplug interrupts during reset drivers/pci/hotplug/pciehp.h | 2 ++ drivers/pci/hotplug/pciehp_core.c | 19 +++++++++++++++++++ drivers/pci/hotplug/pciehp_hpc.c | 36 ++++++++++++++++++++++++++++-------- drivers/pci/pcie/err.c | 11 +++++++++++ drivers/pci/pcie/portdrv.h | 2 ++ 5 files changed, 62 insertions(+), 8 deletions(-) -- 2.7.4
