ACPI / hotplug / PCI: Avoid doing too much for spurious notifies
Sometimes we may get a spurious device check or bus check notify for a hotplug device and in those cases we should avoid doing all of the configuration work needed when something actually changes. To that end, check the return value of pci_scan_slot() in enable_slot() and bail out early if it is 0. This turns out to help reduce the amount of diagnostic output from the ACPIPHP subsystem and speed up boot on at least one system that generates multiple device check notifies for PCIe devices on the root bus during boot. Reported-and-tested-by:Alex Williamson <alex.williamson@redhat.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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89ec2f2e
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