I'm having a problem on a number of systems where the IPMI driver isn't able to 
find the ACPI IPMI device.

This is happening because the ACPI scan is attaching the acpi_pnp handler to 
the ACPI IPMI device, which is happening because the IPMI device has a _CID of 
PNP0C01 in addition to an _HID of IPI0001.  This is a problem because 
acpi_scan_attach_handler() doesn't know about the IPMI drivers (ipmi_si / 
ipmi_ssif), which don't register as PNP or ACPI drivers, but instead expect the 
ACPI scan find no applicable driver and thus create a platform device.

This could be fixed pretty easily by modifying acpi_scan_attach_handler() to 
make it return 0 without attaching a handler to devices that have a _HID of 
IPI0001 when the kernel has an IPMI driver available (if, say, CONFIG_IPMI_SI, 
CONFIG_IPMI_SI_MODULE, CONFIG_IPMI_SSIF, or CONFIG_IPMI_SSIF_MODULE are 
defined)... but would this be accepted?  Or is this something that will require 
reworking the IPMI drivers?  Or is there another way?

I'm willing to work on a patch, but I'm not sure what would be an acceptable 
way to fix this.

Thanks,
Stuart


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