thermal: intel: int340x: Protect trip temperature from concurrent updates

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commit 6757a7abe4 upstream.

Trip temperatures are read using ACPI methods and stored in the memory
during zone initializtion and when the firmware sends a notification for
change. This trip temperature is returned when the thermal core calls via
callback get_trip_temp().

But it is possible that while updating the memory copy of the trips when
the firmware sends a notification for change, thermal core is reading the
trip temperature via the callback get_trip_temp(). This may return invalid
trip temperature.

To address this add a mutex to protect the invalid temperature reads in
the callback get_trip_temp() and int340x_thermal_read_trips().

Fixes: 5fbf7f27fa ("Thermal/int340x: Add common thermal zone handler")
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: 5.0+ <stable@vger.kernel.org> # 5.0+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Srinivas Pandruvada 2023-01-23 09:21:10 -08:00 • committed by Greg Kroah-Hartman

parent 8294b4a889

commit 19df0f77b3

2 changed files with 16 additions and 3 deletions

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18

drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c

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1

drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h

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