[PATCH 0/5] platform/x86: hp-wmi: fix bugs in Victus S fan control

[Emre Cecanpunar <emreleno@gmail.com>]

This series fixes five bugs in the hwmon fan control code added for
HP Victus S laptops:

- Return values from WMI calls were silently discarded in two paths
  of hp_wmi_apply_fan_settings(), and the function's own return value
  was ignored by both of its callers.
- cancel_delayed_work_sync() was called from inside the work handler
  it was trying to cancel, causing a potential deadlock.
- schedule_delayed_work() does not reset a pending timer, so rapid
  back-to-back fan updates did not extend the keep-alive window.
- u8 arithmetic was used to compute a signed delta, producing silent
  unsigned wrap-around on malformed firmware fan tables.
- mode and pwm fields in hp_wmi_hwmon_priv were accessed from both
  sysfs and workqueue context without any synchronisation.

Patches are ordered so that each one applies cleanly on top of the
previous. Patches 1-4 are independent fixes; patch 5 (locking) builds
on patch 2 (cancel_delayed_work) to avoid a lock-ordering issue.

Emre Cecanpunar (5):
  platform/x86: hp-wmi: fix ignored return values in fan settings
  platform/x86: hp-wmi: avoid cancel_delayed_work_sync from work handler
  platform/x86: hp-wmi: use mod_delayed_work to reset keep-alive timer
  platform/x86: hp-wmi: fix u8 underflow in gpu_delta calculation
  platform/x86: hp-wmi: add locking for concurrent hwmon access

 drivers/platform/x86/hp/hp-wmi.c | 59 ++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 18 deletions(-)

-- 
2.53.0