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Message-Id: <1467427749-31379-1-git-send-email-edubezval@gmail.com>
Date: Fri, 1 Jul 2016 19:49:09 -0700
From: Eduardo Valentin <edubezval@...il.com>
To: Rui Zhang <rui.zhang@...el.com>
Cc: Eduardo Valentin <edubezval@...il.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
"Lee, Chun-Yi" <jlee@...e.com>, Darren Hart <dvhart@...radead.org>,
Keerthy <j-keerthy@...com>, linux-kernel@...r.kernel.org,
linux-omap@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: [PATCHv2 1/1] thermal: sysfs: lock tz while on access to mode properties
Serialized calls to tz.ops in user facing
sysfs handler mode_show() and mode_store().
Because several drivers do the following pattern:
.set_mode()
...
local_data->mode = new_mode;
thermal_zone_device_update(tz);
makes sense to simply do the thermal_zone_device_update()
in thermal core, after setting the new mode.
as .set_mode() is now called always with tz->lock held.
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org
Cc: "Lee, Chun-Yi" <jlee@...e.com>
Cc: Darren Hart <dvhart@...radead.org>
Cc: Zhang Rui <rui.zhang@...el.com>
Cc: Keerthy <j-keerthy@...com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-omap@...r.kernel.org
Cc: platform-driver-x86@...r.kernel.org
Cc: linux-pm@...r.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
---
drivers/acpi/thermal.c | 1 -
drivers/platform/x86/acerhdf.c | 1 -
drivers/thermal/imx_thermal.c | 1 -
drivers/thermal/of-thermal.c | 5 -----
drivers/thermal/thermal_sysfs.c | 14 +++++++++++---
drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 5 -----
6 files changed, 11 insertions(+), 16 deletions(-)
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 82707f9..03c3460 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -581,7 +581,6 @@ static int thermal_set_mode(struct thermal_zone_device *thermal,
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"%s kernel ACPI thermal control\n",
tz->tz_enabled ? "Enable" : "Disable"));
- acpi_thermal_check(tz);
}
return 0;
}
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 460fa67..aee33ba 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -405,7 +405,6 @@ static inline void acerhdf_enable_kernelmode(void)
kernelmode = 1;
thz_dev->polling_delay = interval*1000;
- thermal_zone_device_update(thz_dev);
pr_notice("kernel mode fan control ON\n");
}
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index c5547bd..a413eb6 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -246,7 +246,6 @@ static int imx_set_mode(struct thermal_zone_device *tz,
}
data->mode = mode;
- thermal_zone_device_update(tz);
return 0;
}
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index b8e509c..95c47da 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -282,17 +282,12 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
{
struct __thermal_zone *data = tz->devdata;
- mutex_lock(&tz->lock);
-
if (mode == THERMAL_DEVICE_ENABLED)
tz->polling_delay = data->polling_delay;
else
tz->polling_delay = 0;
- mutex_unlock(&tz->lock);
-
data->mode = mode;
- thermal_zone_device_update(tz);
return 0;
}
diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
index ee983ca..1e223d4 100644
--- a/drivers/thermal/thermal_sysfs.c
+++ b/drivers/thermal/thermal_sysfs.c
@@ -62,7 +62,9 @@ mode_show(struct device *dev, struct device_attribute *attr, char *buf)
if (!tz->ops->get_mode)
return -EPERM;
+ mutex_lock(&tz->lock);
result = tz->ops->get_mode(tz, &mode);
+ mutex_unlock(&tz->lock);
if (result)
return result;
@@ -75,17 +77,23 @@ mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
+ enum thermal_device_mode mode = THERMAL_DEVICE_DISABLED;
int result;
if (!tz->ops->set_mode)
return -EPERM;
if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
- result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
+ mode = THERMAL_DEVICE_ENABLED;
else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
- result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
+ mode = THERMAL_DEVICE_DISABLED;
else
- result = -EINVAL;
+ return -EINVAL;
+
+ mutex_lock(&tz->lock);
+ result = tz->ops->set_mode(tz, mode);
+ mutex_unlock(&tz->lock);
+ thermal_zone_device_update(tz);
if (result)
return result;
diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
index 15c0a9a..5dce053 100644
--- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
+++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
@@ -193,19 +193,14 @@ static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
return 0;
}
- mutex_lock(&data->ti_thermal->lock);
-
if (mode == THERMAL_DEVICE_ENABLED)
data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
else
data->ti_thermal->polling_delay = 0;
- mutex_unlock(&data->ti_thermal->lock);
-
data->mode = mode;
ti_bandgap_write_update_interval(bgp, data->sensor_id,
data->ti_thermal->polling_delay);
- thermal_zone_device_update(data->ti_thermal);
dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
data->ti_thermal->polling_delay);
--
2.1.4
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