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Sat, 10 Jan 2026 01:29:11 -0800 (PST) Received: from gmail.com ([2402:e280:3e9b:22f:5089:d5e0:85cd:c96c]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-81eaeda5145sm3211071b3a.28.2026.01.10.01.29.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jan 2026 01:29:11 -0800 (PST) From: Sumeet Pawnikar To: rafael@kernel.org, daniel.lezcano@kernel.org, rui.zhang@intel.com, lukasz.luba@arm.com, linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, sumeet4linux@gmail.com Subject: [PATCH] thermal: Replace sprintf() with sysfs_emit() for sysfs show functions Date: Sat, 10 Jan 2026 14:58:51 +0530 Message-ID: <20260110092851.9078-1-sumeet4linux@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace all sprintf() calls with sysfs_emit() and sysfs_emit_at() in sysfs show functions. sysfs_emit() and sysfs_emit_at() are preferred over sprintf() for formatting sysfs output as they provide better bounds checking and prevent potential buffer overflows. Signed-off-by: Sumeet Pawnikar --- drivers/thermal/thermal_hwmon.c | 4 ++-- drivers/thermal/thermal_sysfs.c | 36 ++++++++++++++++----------------- 2 files changed, 20 insertions(+), 20 deletions(-) diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmo= n.c index 64cc3ab949fe..faf1d0083890 100644 --- a/drivers/thermal/thermal_hwmon.c +++ b/drivers/thermal/thermal_hwmon.c @@ -63,7 +63,7 @@ temp_input_show(struct device *dev, struct device_attribu= te *attr, char *buf) if (ret) return ret; =20 - return sprintf(buf, "%d\n", temperature); + return sysfs_emit(buf, "%d\n", temperature); } =20 static ssize_t @@ -84,7 +84,7 @@ temp_crit_show(struct device *dev, struct device_attribut= e *attr, char *buf) if (ret) return ret; =20 - return sprintf(buf, "%d\n", temperature); + return sysfs_emit(buf, "%d\n", temperature); } =20 =20 diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysf= s.c index d80612506a33..26b8b340fbe6 100644 --- a/drivers/thermal/thermal_sysfs.c +++ b/drivers/thermal/thermal_sysfs.c @@ -29,7 +29,7 @@ type_show(struct device *dev, struct device_attribute *at= tr, char *buf) { struct thermal_zone_device *tz =3D to_thermal_zone(dev); =20 - return sprintf(buf, "%s\n", tz->type); + return sysfs_emit(buf, "%s\n", tz->type); } =20 static ssize_t @@ -41,7 +41,7 @@ temp_show(struct device *dev, struct device_attribute *at= tr, char *buf) ret =3D thermal_zone_get_temp(tz, &temperature); =20 if (!ret) - return sprintf(buf, "%d\n", temperature); + return sysfs_emit(buf, "%d\n", temperature); =20 if (ret =3D=3D -EAGAIN) return -ENODATA; @@ -57,9 +57,9 @@ mode_show(struct device *dev, struct device_attribute *at= tr, char *buf) guard(thermal_zone)(tz); =20 if (tz->mode =3D=3D THERMAL_DEVICE_ENABLED) - return sprintf(buf, "enabled\n"); + return sysfs_emit(buf, "enabled\n"); =20 - return sprintf(buf, "disabled\n"); + return sysfs_emit(buf, "disabled\n"); } =20 static ssize_t @@ -97,7 +97,7 @@ trip_point_type_show(struct device *dev, struct device_at= tribute *attr, { struct thermal_trip *trip =3D thermal_trip_of_attr(attr, type); =20 - return sprintf(buf, "%s\n", thermal_trip_type_name(trip->type)); + return sysfs_emit(buf, "%s\n", thermal_trip_type_name(trip->type)); } =20 static ssize_t @@ -142,7 +142,7 @@ trip_point_temp_show(struct device *dev, struct device_= attribute *attr, { struct thermal_trip *trip =3D thermal_trip_of_attr(attr, temp); =20 - return sprintf(buf, "%d\n", READ_ONCE(trip->temperature)); + return sysfs_emit(buf, "%d\n", READ_ONCE(trip->temperature)); } =20 static ssize_t @@ -188,7 +188,7 @@ trip_point_hyst_show(struct device *dev, struct device_= attribute *attr, { struct thermal_trip *trip =3D thermal_trip_of_attr(attr, hyst); =20 - return sprintf(buf, "%d\n", READ_ONCE(trip->hysteresis)); + return sysfs_emit(buf, "%d\n", READ_ONCE(trip->hysteresis)); } =20 static ssize_t @@ -213,7 +213,7 @@ policy_show(struct device *dev, struct device_attribute= *devattr, char *buf) { struct thermal_zone_device *tz =3D to_thermal_zone(dev); =20 - return sprintf(buf, "%s\n", tz->governor->name); + return sysfs_emit(buf, "%s\n", tz->governor->name); } =20 static ssize_t @@ -260,7 +260,7 @@ sustainable_power_show(struct device *dev, struct devic= e_attribute *devattr, struct thermal_zone_device *tz =3D to_thermal_zone(dev); =20 if (tz->tzp) - return sprintf(buf, "%u\n", tz->tzp->sustainable_power); + return sysfs_emit(buf, "%u\n", tz->tzp->sustainable_power); else return -EIO; } @@ -291,7 +291,7 @@ sustainable_power_store(struct device *dev, struct devi= ce_attribute *devattr, struct thermal_zone_device *tz =3D to_thermal_zone(dev); \ \ if (tz->tzp) \ - return sprintf(buf, "%d\n", tz->tzp->name); \ + return sysfs_emit(buf, "%d\n", tz->tzp->name); \ else \ return -EIO; \ } \ @@ -505,7 +505,7 @@ cdev_type_show(struct device *dev, struct device_attrib= ute *attr, char *buf) { struct thermal_cooling_device *cdev =3D to_cooling_device(dev); =20 - return sprintf(buf, "%s\n", cdev->type); + return sysfs_emit(buf, "%s\n", cdev->type); } =20 static ssize_t max_state_show(struct device *dev, struct device_attribute = *attr, @@ -513,7 +513,7 @@ static ssize_t max_state_show(struct device *dev, struc= t device_attribute *attr, { struct thermal_cooling_device *cdev =3D to_cooling_device(dev); =20 - return sprintf(buf, "%ld\n", cdev->max_state); + return sysfs_emit(buf, "%ld\n", cdev->max_state); } =20 static ssize_t cur_state_show(struct device *dev, struct device_attribute = *attr, @@ -526,7 +526,7 @@ static ssize_t cur_state_show(struct device *dev, struc= t device_attribute *attr, ret =3D cdev->ops->get_cur_state(cdev, &state); if (ret) return ret; - return sprintf(buf, "%ld\n", state); + return sysfs_emit(buf, "%ld\n", state); } =20 static ssize_t @@ -638,7 +638,7 @@ static ssize_t total_trans_show(struct device *dev, return 0; =20 spin_lock(&stats->lock); - ret =3D sprintf(buf, "%u\n", stats->total_trans); + ret =3D sysfs_emit(buf, "%u\n", stats->total_trans); spin_unlock(&stats->lock); =20 return ret; @@ -664,8 +664,8 @@ time_in_state_ms_show(struct device *dev, struct device= _attribute *attr, update_time_in_state(stats); =20 for (i =3D 0; i <=3D cdev->max_state; i++) { - len +=3D sprintf(buf + len, "state%u\t%llu\n", i, - ktime_to_ms(stats->time_in_state[i])); + len +=3D sysfs_emit_at(buf, len, "state%u\t%llu\n", i, + ktime_to_ms(stats->time_in_state[i])); } spin_unlock(&stats->lock); =20 @@ -846,7 +846,7 @@ trip_point_show(struct device *dev, struct device_attri= bute *attr, char *buf) =20 instance =3D container_of(attr, struct thermal_instance, attr); =20 - return sprintf(buf, "%d\n", thermal_zone_trip_id(tz, instance->trip)); + return sysfs_emit(buf, "%d\n", thermal_zone_trip_id(tz, instance->trip)); } =20 ssize_t @@ -856,7 +856,7 @@ weight_show(struct device *dev, struct device_attribute= *attr, char *buf) =20 instance =3D container_of(attr, struct thermal_instance, weight_attr); =20 - return sprintf(buf, "%d\n", instance->weight); + return sysfs_emit(buf, "%d\n", instance->weight); } =20 ssize_t weight_store(struct device *dev, struct device_attribute *attr, --=20 2.43.0