Messages in this thread | | | Date | Thu, 2 Mar 2006 20:39:53 -0700 (MST) | Subject | Re: + pnp-mpu401-adjust-pnp_register_driver-signature.patch added to -mm tree | From | "Bjorn Helgaas" <> |
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>> 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.) > > Huh? > > How do onboard devices or ISA plug and play devices support hot-plug? > > Or what devices supported by the pnp subsystem support hot-plug?
I don't know for sure whether ISAPNP or PNPBIOS support hot-plug, but ACPI does, and ACPI devices are being integrated into the PNP subsystem via PNPACPI.
One example is HP sx2000 hardware that supports hot-plug of cells. Each cell contains CPUs, memory, I/O bridges, and some miscellaneous hardware like on-board serial devices. All this stuff is described by ACPI, and we'd like to use PNP drivers like 8250_pnp.c when we can.
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