PCI: hv: Lock PCI bus on device eject

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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 potentially
modify the bus from multiple places.

Properly lock the bus access.

Thanks Dexuan Cui <decui@microsoft.com> for pointing out the race condition
in create_root_hv_pci_bus().

Reported-by: Xiaofeng Wang <xiaofwan@redhat.com>
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>

...

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Long Li 2017-03-23 14:58:32 -07:00 • committed by Bjorn Helgaas

parent d3a78d8bf7

commit 414428c5da

1 changed files with 4 additions and 0 deletions

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drivers/pci/host/pci-hyperv.c

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