[SRU v2] [G] [PATCH 0/6] Prevent thermal shutdown during boot process

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1906168

[Impact]
Surprising thermal shutdown at boot on Intel based mobile workstations.

[Fix]
Since these thermal devcies are not in ACPI ThermalZone, OS shouldn't
shutdown the system.

These critial temperatures are for usespace to handle, so let kernel
know it shouldn't handle it.

For Groovy, a patch that removes .notify callback is dropped.

[Test]
Use reboot stress as a reproducer. 5% chance to see a surprising
shutdown at boot.

With the fix applied, the thermal shutdown is no longer reproducible.

[Where problems could occur]
For ACPI based platforms, we still have "acpitz" to protect systems from
overheating. If these acpitz sensors don't work, then the system could
face real overheating issue.

Daniel Lezcano (4):
  thermal/core: Emit a warning if the thermal zone is updated without
    ops
  thermal/core: Add critical and hot ops
  thermal/drivers/acpi: Use hot and critical ops
  thermal/drivers/rcar: Remove notification usage

Kai-Heng Feng (2):
  thermal: int340x: Fix unexpected shutdown at critical temperature
  thermal: intel: pch: Fix unexpected shutdown at critical temperature

 drivers/acpi/thermal.c                        | 30 ++++++------
 .../int340x_thermal/int340x_thermal_zone.c    |  6 +++
 drivers/thermal/intel/intel_pch_thermal.c     |  6 +++
 drivers/thermal/rcar_thermal.c                | 19 --------
 drivers/thermal/thermal_core.c                | 46 ++++++++++++-------
 include/linux/thermal.h                       |  3 ++
 6 files changed, 58 insertions(+), 52 deletions(-)

-- 
2.29.2