PCI hotplug + EEH issues

[Anton Blanchard]

> That reminds me we need to add a rwlock around device-tree functions
> since we can (and will occasionally) write to it (add properties
> is what I have in mind, locking on access to an actual property data
> is beyond the scope).

Yep, Im going to need to add and remove properties in the pSeries PCI
hotplug driver :)

Anton

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