From 9686f04a7ba6366dbdbb5609dc26a6282803b888 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 22 Feb 2024 18:15:39 +0100 Subject: thermal: ACPI: Discard trips table after zone registration Because the thermal core creates and uses its own copy of the trips table passed to thermal_zone_device_register_with_trips(), it is not necessary to hold on to a local copy of it any more after the given thermal zone has been registered. Accordingly, modify the ACPI thermal driver to store the trips table passed to thermal_zone_device_register_with_trips() in a local variable which is automatically discarded when acpi_thermal_add() returns to its caller. Also make some additional code simplifications unlocked by the above change. Signed-off-by: Rafael J. Wysocki Reviewed-by: Stanislaw Gruszka Acked-by: Daniel Lezcano --- drivers/acpi/thermal.c | 57 ++++++++++++++++++-------------------------------- 1 file changed, 20 insertions(+), 37 deletions(-) (limited to 'drivers/acpi/thermal.c') diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c index 4748e8061253..6c4ba00d60e2 100644 --- a/drivers/acpi/thermal.c +++ b/drivers/acpi/thermal.c @@ -47,6 +47,8 @@ #define ACPI_THERMAL_TRIP_PASSIVE (-1) +#define ACPI_THERMAL_MAX_NR_TRIPS (ACPI_THERMAL_MAX_ACTIVE + 3) + /* * This exception is thrown out in two cases: * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid @@ -112,7 +114,6 @@ struct acpi_thermal { unsigned long polling_frequency; volatile u8 zombie; struct acpi_thermal_trips trips; - struct thermal_trip *trip_table; struct thermal_zone_device *thermal_zone; int kelvin_offset; /* in millidegrees */ struct work_struct thermal_check_work; @@ -451,26 +452,19 @@ fail: return false; } -static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) +static void acpi_thermal_get_trip_points(struct acpi_thermal *tz) { - unsigned int count = 0; int i; - if (acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE)) - count++; + acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE); for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { - if (acpi_thermal_init_trip(tz, i)) - count++; - else + if (!acpi_thermal_init_trip(tz, i)) break; - } while (++i < ACPI_THERMAL_MAX_ACTIVE) tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID; - - return count; } /* sys I/F for generic thermal sysfs support */ @@ -662,13 +656,14 @@ static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz) } static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz, + const struct thermal_trip *trip_table, unsigned int trip_count, int passive_delay) { int result; tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz", - tz->trip_table, + trip_table, trip_count, 0, tz, &acpi_thermal_zone_ops, @@ -823,10 +818,10 @@ static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz) static int acpi_thermal_add(struct acpi_device *device) { + struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 }; struct acpi_thermal_trip *acpi_trip; struct thermal_trip *trip; struct acpi_thermal *tz; - unsigned int trip_count; int crit_temp, hot_temp; int passive_delay = 0; int result; @@ -848,21 +843,10 @@ static int acpi_thermal_add(struct acpi_device *device) acpi_thermal_aml_dependency_fix(tz); /* Get trip points [_CRT, _PSV, etc.] (required). */ - trip_count = acpi_thermal_get_trip_points(tz); + acpi_thermal_get_trip_points(tz); crit_temp = acpi_thermal_get_critical_trip(tz); - if (crit_temp != THERMAL_TEMP_INVALID) - trip_count++; - hot_temp = acpi_thermal_get_hot_trip(tz); - if (hot_temp != THERMAL_TEMP_INVALID) - trip_count++; - - if (!trip_count) { - pr_warn(FW_BUG "No valid trip points!\n"); - result = -ENODEV; - goto free_memory; - } /* Get temperature [_TMP] (required). */ result = acpi_thermal_get_temperature(tz); @@ -881,13 +865,7 @@ static int acpi_thermal_add(struct acpi_device *device) acpi_thermal_guess_offset(tz, crit_temp); - trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL); - if (!trip) { - result = -ENOMEM; - goto free_memory; - } - - tz->trip_table = trip; + trip = trip_table; if (crit_temp != THERMAL_TEMP_INVALID) { trip->type = THERMAL_TRIP_CRITICAL; @@ -923,9 +901,17 @@ static int acpi_thermal_add(struct acpi_device *device) trip++; } - result = acpi_thermal_register_thermal_zone(tz, trip_count, passive_delay); + if (trip == trip_table) { + pr_warn(FW_BUG "No valid trip points!\n"); + result = -ENODEV; + goto free_memory; + } + + result = acpi_thermal_register_thermal_zone(tz, trip_table, + trip - trip_table, + passive_delay); if (result) - goto free_trips; + goto free_memory; refcount_set(&tz->thermal_check_count, 3); mutex_init(&tz->thermal_check_lock); @@ -944,8 +930,6 @@ static int acpi_thermal_add(struct acpi_device *device) flush_wq: flush_workqueue(acpi_thermal_pm_queue); acpi_thermal_unregister_thermal_zone(tz); -free_trips: - kfree(tz->trip_table); free_memory: acpi_thermal_free_thermal_zone(tz); @@ -966,7 +950,6 @@ static void acpi_thermal_remove(struct acpi_device *device) flush_workqueue(acpi_thermal_pm_queue); acpi_thermal_unregister_thermal_zone(tz); - kfree(tz->trip_table); acpi_thermal_free_thermal_zone(tz); } -- cgit v1.2.3-58-ga151