system generating an NMI due to 80696f991424d ("PCI: pciehp: Tolerate Presence Detect hardwired to zero")

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Hi,

I got a bug report about some systems generating an NMI and
subsequently crashing bisected down to 80696f991424d.
Apparently these systems do not react well to __pciehp_enable_slot
while no card is present. Restoring the check to __pciehp_enable_slot()
removed in 80696f991424d makes the current kernels work.

What is to be done? Do you want a special case for the affected
systems based on DMI, or should I revert 80696f991424d?

	Regards
		Oliver




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