thermal: Cleanup patches

thermal: Cleanup patches

[Sascha Hauer]

This series contains some cleanup patches for the thermal framework.
Some patches are already acked by Eduardo but not yet included in any
tree. Please review/apply.

Sascha

----------------------------------------------------------------
Sascha Hauer (4):
      thermal: trivial: fix typo in comment
      thermal: remove unnecessary call to thermal_zone_device_set_polling
      thermal: Use IS_ENABLED instead of #ifdef
      thermal: Add comment explaining test for critical temperature

 drivers/thermal/thermal_core.c | 55 +++++++++++++++++++-----------------------
 1 file changed, 25 insertions(+), 30 deletions(-)

[PATCH 1/4] thermal: trivial: fix typo in comment

[Sascha Hauer]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
---
 drivers/thermal/thermal_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 04659bf..34ce9e4 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -465,7 +465,7 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 }
 
 /**
- * thermal_zone_get_temp() - returns its the temperature of thermal zone
+ * thermal_zone_get_temp() - returns the temperature of a thermal zone
  * @tz: a valid pointer to a struct thermal_zone_device
  * @temp: a valid pointer to where to store the resulting temperature.
  *
-- 
2.1.4

[PATCH 2/4] thermal: remove unnecessary call to thermal_zone_device_set_polling

[Sascha Hauer]

When the thermal zone has no get_temp callback then thermal_zone_device_register()
calls thermal_zone_device_set_polling() with a polling delay of 0. This
only cancels the poll_queue. Since the poll_queue hasn't been scheduled this
is a no-op. Remove it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
---
 drivers/thermal/thermal_core.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 34ce9e4..aa0a661 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1848,9 +1848,6 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 
 	INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
 
-	if (!tz->ops->get_temp)
-		thermal_zone_device_set_polling(tz, 0);
-
 	thermal_zone_device_update(tz);
 
 	return tz;
-- 
2.1.4

[PATCH 3/4] thermal: Use IS_ENABLED instead of #ifdef

[Sascha Hauer]

Use IS_ENABLED(CONFIG_THERMAL_EMULATION) to make the code more readable
and to get rid of the addtional #ifdef around the variable definitions
in thermal_zone_get_temp().

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/thermal/thermal_core.c | 45 ++++++++++++++++++------------------------
 1 file changed, 19 insertions(+), 26 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index aa0a661..67296da 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -477,11 +477,9 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 {
 	int ret = -EINVAL;
-#ifdef CONFIG_THERMAL_EMULATION
 	int count;
 	unsigned long crit_temp = -1UL;
 	enum thermal_trip_type type;
-#endif
 
 	if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 		goto exit;
@@ -489,25 +487,21 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 	mutex_lock(&tz->lock);
 
 	ret = tz->ops->get_temp(tz, temp);
-#ifdef CONFIG_THERMAL_EMULATION
-	if (!tz->emul_temperature)
-		goto skip_emul;
-
-	for (count = 0; count < tz->trips; count++) {
-		ret = tz->ops->get_trip_type(tz, count, &type);
-		if (!ret && type == THERMAL_TRIP_CRITICAL) {
-			ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
-			break;
-		}
-	}
 
-	if (ret)
-		goto skip_emul;
+	if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
+		for (count = 0; count < tz->trips; count++) {
+			ret = tz->ops->get_trip_type(tz, count, &type);
+			if (!ret && type == THERMAL_TRIP_CRITICAL) {
+				ret = tz->ops->get_trip_temp(tz, count,
+						&crit_temp);
+				break;
+			}
+		}
 
-	if (*temp < crit_temp)
-		*temp = tz->emul_temperature;
-skip_emul:
-#endif
+		if (!ret && *temp < crit_temp)
+			*temp = tz->emul_temperature;
+	}
+ 
 	mutex_unlock(&tz->lock);
 exit:
 	return ret;
@@ -847,7 +841,6 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 	return sprintf(buf, "%s\n", tz->governor->name);
 }
 
-#ifdef CONFIG_THERMAL_EMULATION
 static ssize_t
 emul_temp_store(struct device *dev, struct device_attribute *attr,
 		     const char *buf, size_t count)
@@ -873,7 +866,6 @@ emul_temp_store(struct device *dev, struct device_attribute *attr,
 	return ret ? ret : count;
 }
 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
-#endif/*CONFIG_THERMAL_EMULATION*/
 
 static ssize_t
 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
@@ -1802,11 +1794,12 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 			goto unregister;
 	}
 
-#ifdef CONFIG_THERMAL_EMULATION
-	result = device_create_file(&tz->device, &dev_attr_emul_temp);
-	if (result)
-		goto unregister;
-#endif
+	if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
+		result = device_create_file(&tz->device, &dev_attr_emul_temp);
+		if (result)
+			goto unregister;
+	}
+
 	/* Create policy attribute */
 	result = device_create_file(&tz->device, &dev_attr_policy);
 	if (result)
-- 
2.1.4

[PATCH 4/4] thermal: Add comment explaining test for critical temperature

[Sascha Hauer]

The code testing if a temperature should be emulated or not is
not obvious. Add a comment explaining why this test is done.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/thermal/thermal_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 67296da..956684e 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -498,6 +498,11 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 			}
 		}
 
+		/*
+		 * Only allow emulating a temperature when the real temperature
+		 * is below the critical temperature so that the emulation code
+		 * cannot hide critical conditions.
+		 */
 		if (!ret && *temp < crit_temp)
 			*temp = tz->emul_temperature;
 	}
-- 
2.1.4

Re: [PATCH 3/4] thermal: Use IS_ENABLED instead of #ifdef

[Lukasz Majewski]

Hi Sascha,

> Use IS_ENABLED(CONFIG_THERMAL_EMULATION) to make the code more
> readable and to get rid of the addtional #ifdef around the variable
> definitions in thermal_zone_get_temp().

Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>

> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>  drivers/thermal/thermal_core.c | 45
> ++++++++++++++++++------------------------ 1 file changed, 19
> insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_core.c
> b/drivers/thermal/thermal_core.c index aa0a661..67296da 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -477,11 +477,9 @@ static void handle_thermal_trip(struct
> thermal_zone_device *tz, int trip) int thermal_zone_get_temp(struct
> thermal_zone_device *tz, unsigned long *temp) {
>  	int ret = -EINVAL;
> -#ifdef CONFIG_THERMAL_EMULATION
>  	int count;
>  	unsigned long crit_temp = -1UL;
>  	enum thermal_trip_type type;
> -#endif
>  
>  	if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
>  		goto exit;
> @@ -489,25 +487,21 @@ int thermal_zone_get_temp(struct
> thermal_zone_device *tz, unsigned long *temp) mutex_lock(&tz->lock);
>  
>  	ret = tz->ops->get_temp(tz, temp);
> -#ifdef CONFIG_THERMAL_EMULATION
> -	if (!tz->emul_temperature)
> -		goto skip_emul;
> -
> -	for (count = 0; count < tz->trips; count++) {
> -		ret = tz->ops->get_trip_type(tz, count, &type);
> -		if (!ret && type == THERMAL_TRIP_CRITICAL) {
> -			ret = tz->ops->get_trip_temp(tz, count,
> &crit_temp);
> -			break;
> -		}
> -	}
>  
> -	if (ret)
> -		goto skip_emul;
> +	if (IS_ENABLED(CONFIG_THERMAL_EMULATION) &&
> tz->emul_temperature) {
> +		for (count = 0; count < tz->trips; count++) {
> +			ret = tz->ops->get_trip_type(tz, count,
> &type);
> +			if (!ret && type == THERMAL_TRIP_CRITICAL) {
> +				ret = tz->ops->get_trip_temp(tz,
> count,
> +						&crit_temp);
> +				break;
> +			}
> +		}
>  
> -	if (*temp < crit_temp)
> -		*temp = tz->emul_temperature;
> -skip_emul:
> -#endif
> +		if (!ret && *temp < crit_temp)
> +			*temp = tz->emul_temperature;
> +	}
> + 
>  	mutex_unlock(&tz->lock);
>  exit:
>  	return ret;
> @@ -847,7 +841,6 @@ policy_show(struct device *dev, struct
> device_attribute *devattr, char *buf) return sprintf(buf, "%s\n",
> tz->governor->name); }
>  
> -#ifdef CONFIG_THERMAL_EMULATION
>  static ssize_t
>  emul_temp_store(struct device *dev, struct device_attribute *attr,
>  		     const char *buf, size_t count)
> @@ -873,7 +866,6 @@ emul_temp_store(struct device *dev, struct
> device_attribute *attr, return ret ? ret : count;
>  }
>  static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
> -#endif/*CONFIG_THERMAL_EMULATION*/
>  
>  static ssize_t
>  sustainable_power_show(struct device *dev, struct device_attribute
> *devattr, @@ -1802,11 +1794,12 @@ struct thermal_zone_device
> *thermal_zone_device_register(const char *type, goto unregister;
>  	}
>  
> -#ifdef CONFIG_THERMAL_EMULATION
> -	result = device_create_file(&tz->device,
> &dev_attr_emul_temp);
> -	if (result)
> -		goto unregister;
> -#endif
> +	if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
> +		result = device_create_file(&tz->device,
> &dev_attr_emul_temp);
> +		if (result)
> +			goto unregister;
> +	}
> +
>  	/* Create policy attribute */
>  	result = device_create_file(&tz->device, &dev_attr_policy);
>  	if (result)



-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group

Re: [PATCH 1/4] thermal: trivial: fix typo in comment

[Sascha Hauer]

Hi Rui,

Any input to this series? Could you apply it?

Sascha

On Mon, Jul 06, 2015 at 09:46:14AM +0200, Sascha Hauer wrote:
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> Acked-by: Eduardo Valentin <edubezval@gmail.com>
> ---
>  drivers/thermal/thermal_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 04659bf..34ce9e4 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -465,7 +465,7 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
>  }
>  
>  /**
> - * thermal_zone_get_temp() - returns its the temperature of thermal zone
> + * thermal_zone_get_temp() - returns the temperature of a thermal zone
>   * @tz: a valid pointer to a struct thermal_zone_device
>   * @temp: a valid pointer to where to store the resulting temperature.
>   *
> -- 
> 2.1.4
> 
> 

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