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

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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>
This commit is contained in:
Srinivas Pandruvada 2023-01-23 09:21:10 -08:00 committed by Rafael J. Wysocki
parent 2241ab53cb
commit 6757a7abe4
2 changed files with 16 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
View File

@ -44,11 +44,13 @@ static int int340x_thermal_get_trip_temp(struct thermal_zone_device *zone,
int trip, int *temp)
{
struct int34x_thermal_zone *d = zone->devdata;
int i;
int i, ret = 0;
if (d->override_ops && d->override_ops->get_trip_temp)
return d->override_ops->get_trip_temp(zone, trip, temp);
mutex_lock(&d->trip_mutex);
if (trip < d->aux_trip_nr)
*temp = d->aux_trips[trip];
else if (trip == d->crt_trip_id)
@ -66,10 +68,12 @@ static int int340x_thermal_get_trip_temp(struct thermal_zone_device *zone,
}
}
if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
return -EINVAL;
ret = -EINVAL;
}
return 0;
mutex_unlock(&d->trip_mutex);
return ret;
}
static int int340x_thermal_get_trip_type(struct thermal_zone_device *zone,
@ -180,6 +184,8 @@ int int340x_thermal_read_trips(struct int34x_thermal_zone *int34x_zone)
int trip_cnt = int34x_zone->aux_trip_nr;
int i;
mutex_lock(&int34x_zone->trip_mutex);
int34x_zone->crt_trip_id = -1;
if (!int340x_thermal_get_trip_config(int34x_zone->adev->handle, "_CRT",
&int34x_zone->crt_temp))
@ -207,6 +213,8 @@ int int340x_thermal_read_trips(struct int34x_thermal_zone *int34x_zone)
int34x_zone->act_trips[i].valid = true;
}
mutex_unlock(&int34x_zone->trip_mutex);
return trip_cnt;
}
EXPORT_SYMBOL_GPL(int340x_thermal_read_trips);
@ -230,6 +238,8 @@ struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
if (!int34x_thermal_zone)
return ERR_PTR(-ENOMEM);
mutex_init(&int34x_thermal_zone->trip_mutex);
int34x_thermal_zone->adev = adev;
int34x_thermal_zone->override_ops = override_ops;
@ -281,6 +291,7 @@ err_thermal_zone:
acpi_lpat_free_conversion_table(int34x_thermal_zone->lpat_table);
kfree(int34x_thermal_zone->aux_trips);
err_trip_alloc:
mutex_destroy(&int34x_thermal_zone->trip_mutex);
kfree(int34x_thermal_zone);
return ERR_PTR(ret);
}
@ -292,6 +303,7 @@ void int340x_thermal_zone_remove(struct int34x_thermal_zone
thermal_zone_device_unregister(int34x_thermal_zone->zone);
acpi_lpat_free_conversion_table(int34x_thermal_zone->lpat_table);
kfree(int34x_thermal_zone->aux_trips);
mutex_destroy(&int34x_thermal_zone->trip_mutex);
kfree(int34x_thermal_zone);
}
EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove);

1
drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
View File

@ -32,6 +32,7 @@ struct int34x_thermal_zone {
struct thermal_zone_device_ops *override_ops;
void *priv_data;
struct acpi_lpat_conversion_table *lpat_table;
struct mutex trip_mutex;
};
struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *,