On Mon, Feb 26, Christian Krafft wrote:

ipmi_si_intf tries to access default ports, if no device could
be found elsewhere. On PPC we have a function to check,
if these legacy IO ports are accessible. This patch adds
a check for these ports on PPC.
This patch fixes a breakage of IPMI module
on PPC machines without a BMC.

This patch is a no-op even for IPMI capable systems.
None of the platform check_legacy_ioport() functions check for port
number 0xca2, 0xca9 or 0xe4.

What exactly did you test? Appearently not Linus tree.