| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 25 Jan 2023 15:54:03 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Linux ACPI <linux-acpi@...r.kernel.org>,
Zhang Rui <rui.zhang@...el.com>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: [PATCH v1 2/3] thermal: intel: int340x: Use zone lock for synchronization
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Because the ->get_trip_temp() and ->get_trip_type() thermal zone
callbacks are only invoked from __thermal_zone_get_trip() which is
always called by the thermal core under the zone lock, it is sufficient
for int340x_thermal_update_trips() to acquire the zone lock for mutual
exclusion with those callbacks.
Accordingly, modify int340x_thermal_update_trips() to use the zone lock
instead of the internal trip_mutex and drop the latter which is not
necessary any more.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c | 28 +++--------
drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h | 1
2 files changed, 8 insertions(+), 21 deletions(-)
Index: linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
+++ linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
@@ -41,9 +41,7 @@ static int int340x_thermal_get_trip_temp
int trip, int *temp)
{
struct int34x_thermal_zone *d = zone->devdata;
- int i, ret = 0;
-
- mutex_lock(&d->trip_mutex);
+ int i;
if (trip < d->aux_trip_nr)
*temp = d->aux_trips[trip];
@@ -62,12 +60,10 @@ static int int340x_thermal_get_trip_temp
}
}
if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
- ret = -EINVAL;
+ return -EINVAL;
}
- mutex_unlock(&d->trip_mutex);
-
- return ret;
+ return 0;
}
static int int340x_thermal_get_trip_type(struct thermal_zone_device *zone,
@@ -75,9 +71,7 @@ static int int340x_thermal_get_trip_type
enum thermal_trip_type *type)
{
struct int34x_thermal_zone *d = zone->devdata;
- int i, ret = 0;
-
- mutex_lock(&d->trip_mutex);
+ int i;
if (trip < d->aux_trip_nr)
*type = THERMAL_TRIP_PASSIVE;
@@ -96,12 +90,10 @@ static int int340x_thermal_get_trip_type
}
}
if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
- ret = -EINVAL;
+ return -EINVAL;
}
- mutex_unlock(&d->trip_mutex);
-
- return ret;
+ return 0;
}
static int int340x_thermal_set_trip_temp(struct thermal_zone_device *zone,
@@ -222,8 +214,6 @@ struct int34x_thermal_zone *int340x_ther
if (!int34x_thermal_zone)
return ERR_PTR(-ENOMEM);
- mutex_init(&int34x_thermal_zone->trip_mutex);
-
int34x_thermal_zone->adev = adev;
int34x_thermal_zone->ops = kmemdup(&int340x_thermal_zone_ops,
@@ -286,7 +276,6 @@ err_thermal_zone:
err_trip_alloc:
kfree(int34x_thermal_zone->ops);
err_ops_alloc:
- mutex_destroy(&int34x_thermal_zone->trip_mutex);
kfree(int34x_thermal_zone);
return ERR_PTR(ret);
}
@@ -299,7 +288,6 @@ void int340x_thermal_zone_remove(struct
acpi_lpat_free_conversion_table(int34x_thermal_zone->lpat_table);
kfree(int34x_thermal_zone->aux_trips);
kfree(int34x_thermal_zone->ops);
- mutex_destroy(&int34x_thermal_zone->trip_mutex);
kfree(int34x_thermal_zone);
}
EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove);
@@ -309,7 +297,7 @@ void int340x_thermal_update_trips(struct
acpi_handle zone_handle = int34x_zone->adev->handle;
int i, err;
- mutex_lock(&int34x_zone->trip_mutex);
+ mutex_lock(&int34x_zone->zone->lock);
if (int34x_zone->crt_trip_id > 0) {
err = int340x_thermal_get_trip_config(zone_handle, "_CRT",
@@ -344,7 +332,7 @@ void int340x_thermal_update_trips(struct
int34x_zone->act_trips[i].temp = THERMAL_TEMP_INVALID;
}
- mutex_unlock(&int34x_zone->trip_mutex);
+ mutex_unlock(&int34x_zone->zone->lock);
}
EXPORT_SYMBOL_GPL(int340x_thermal_update_trips);
Index: linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
+++ linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
@@ -32,7 +32,6 @@ struct int34x_thermal_zone {
struct thermal_zone_device_ops *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 *,
Powered by blists - more mailing lists