[PATCH 0/9] PNP: adjust pnp_register_driver signature

[Bjorn Helgaas]

This series of patches removes the assumption that pnp_register_driver()
returns the number of devices claimed.  Returning the count is unreliable
because devices may be hot-plugged in the future.  (Many devices don't
support hot-plug, of course, but PNP in general does.)

This changes the convention to "zero for success, or a negative error
value," which matches pci_register_driver(), acpi_bus_register_driver(),
and platform_driver_register().

If drivers need to know the number of devices, they can count calls
to their .probe() methods.
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