[PATCHv4 1/1] thermal: core: call thermal_zone_device_update() after mode update

Eduardo Valentin
2016-06-22T15:03:28Z

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.

Also, this patch also remove deadlocks on drivers that
call thermal_zone_device_update() on .set_mode(),
as .set_mode() is now called always with tz->lock held.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Cc: "Lee, Chun-Yi" <jlee@suse.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Cc: platform-driver-x86@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
---
Hello,

V3->V4:
- ti-soc: Removed extra locking from TI SoC in set_mode
- ACPI: Kept the update on check as it is called on other places

BR,

Eduardo

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 | 1 +
drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 5 -----
6 files changed, 1 insertion(+), 13 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 743df50..3d0dc30 100644
--- a/drivers/thermal/thermal_sysfs.c
+++ b/drivers/thermal/thermal_sysfs.c
@@ -100,6 +100,7 @@ mode_store(struct device *dev, struct device_attribute *attr,
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