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Subject[BUG][2.5]deadlock on cpci hot insert
When I hot insert a cpci peripheral board into a ZT5084 chassis
with a ZT5550 system master board, my ZT5550 locks up. I managed
to isolate the problem to a deadlock with list_lock

* hot insert *
||
\/
cpci_hotplug_core.c:check_slots() which does a spin_lock(&list_lock)
||
\/
* inserted card is found *
||
\/
cpci_hotplug_pci.c:cpci_configure_slot()
||
\/
pci_hotplug_util.c:pci_visit_dev()
||
|| (fn->visit_pci_dev)
\/
cpci_hotplug_pci.c:configure_visit_pci_dev()
||
\/
cpci_hotplug_core.c:cpci_find_slot() which also does a spin_lock(&list_lock)
||
\/
* deadlock *


I'm not sure which is the correct way to fix this. Maybe a
cpci_unlocked_find_slot()? hmm... pci_visit_dev is exported,
so anybody could call it.

--rustyl
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