Public bug reported:
[Impact]
The IPMI spec states:
The purpose of the SPMI Table is to provide a mechanism that can be used
by the OSPM (an ACPI term for “OS Operating System-directed
configuration and Power Management” essentially meaning an ACPI-aware OS
or OS loader) very early in the boot process, e.g., before the ability
to execute ACPI control methods in the OS is available.
When we are probing IPMI in Linux, ACPI control methods are available,
so we shouldn't be probing using SPMI. It could cause some confusion
during the probing process.
[Fix]
Fixed upstream in 4.17:
commit 4866b1dce0389013a268f0ab63f7229b30c6e5fe
Author: Corey Minyard <cminy...@mvista.com>
Date: Thu Mar 8 15:00:28 2018 -0600
ipmi: Remove ACPI SPMI probing from the SSIF (I2C) driver
[Test]
-- Test case --
for i in {1..500}; do sudo modprobe -r ipmi_ssif; sleep 2s ; sudo modprobe
ipmi_ssif || exit; done
--------------
-- Before Applying the patch --
Jun 19 18:53:04 starbuck kernel: [ 126.351580] ipmi_ssif 0-000e: Found new BMC
(man_id: 0x000000, prod_id: 0x0202, dev_id: 0x20)
Jun 19 18:53:06 starbuck kernel: [ 128.725391] ipmi_ssif: probe of
dmi-ipmi-ssif.1 failed with error -17
-- With patch applied --
Oct 19 19:59:49 starbuck kernel: [ 1501.699109] IPMI SSIF Interface driver
Oct 19 19:59:49 starbuck kernel: [ 1501.730439] ipmi_ssif: Trying
SMBIOS-specified SSIF interface at i2c address 0xe, adapter xlp9xx-i2c, slave
address 0x20
Oct 19 19:59:49 starbuck kernel: [ 1501.862509] ipmi_ssif 0-000e: Found new BMC
(man_id: 0x000000, prod_id: 0x0202, dev_id: 0x20)
[Regression Potential]
This patch applies to ipmi_ssif driver and was tested on ARM64 Cavium ThunderX2
platform and no regressions were found.
** Affects: linux (Ubuntu)
Importance: Critical
Assignee: Canonical Kernel Team (canonical-kernel-team)
Status: New
** Tags: cavium
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https://bugs.launchpad.net/bugs/1799276
Title:
[Bionic] ipmi: Remove ACPI SPMI probing from the SSIF (I2C) driver
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