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was introduced. If you have a bus, say cardbus, that is derived from a base-bus (say PCI), then ordinarily all PCI drivers would attach to cardbus devices. However, there had been one exception: kldload wouldn't work. The problem is in devclass_add_driver. In this routine, all we did was call to the pci device's BUS_DRIVER_ADDED routine. However, since cardbus bus instances had a different devclass, none of them were called. The solution is to call all subclass devclasses, recursively down the tree, of the class that was loaded. Since we don't have a 'children class' pointer, we search the whole list of devclasses for a class whose parent matches. Since just done a kldload time, this isn't as bad as it sounds. In addition, we short-circuit the whole process by marking those classes with subclasses with a flag. We'll likely have to reevaluate this method the number of devclasses with subclasses gets large. This means we can remove the "cardbus" lines from all the PCI drivers since we have no cardbus specific attach device attachments in the tree. # Also: minor tweak to an error message
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