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[PATCH 10/10] staging: iio: tsl2583: add locking to sysfs attributes

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  [PATCH 10/10] staging: iio: tsl2583: add locking to sysfs attributes Brian Masney <masneyb@onstation.org> - 2016-10-28 12:10 +0200
    Re: [PATCH 10/10] staging: iio: tsl2583: add locking to sysfs  attributes Jonathan Cameron <jic23@kernel.org> - 2016-10-30 19:50 +0100

#1511024 — [PATCH 10/10] staging: iio: tsl2583: add locking to sysfs attributes

in_illuminance_input_target_show(), in_illuminance_input_target_store(),
in_illuminance_calibrate_store(), and in_illuminance_lux_table_store()
accesses data from the tsl2583_chip struct. Some of these fields can be
modified by other parts of the driver concurrently. This patch adds the
mutex locking to these sysfs attributes.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
 drivers/staging/iio/light/tsl2583.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
index 98afa5b..49b19f5 100644
--- a/drivers/staging/iio/light/tsl2583.c
+++ b/drivers/staging/iio/light/tsl2583.c
@@ -513,8 +513,13 @@ static ssize_t in_illuminance_input_target_show(struct device *dev,
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct tsl2583_chip *chip = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&chip->als_mutex);
+	ret = sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
+	mutex_unlock(&chip->als_mutex);
 
-	return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
+	return ret;
 }
 
 static ssize_t in_illuminance_input_target_store(struct device *dev,
@@ -528,7 +533,9 @@ static ssize_t in_illuminance_input_target_store(struct device *dev,
 	if (kstrtoint(buf, 0, &value) || !value)
 		return -EINVAL;
 
+	mutex_lock(&chip->als_mutex);
 	chip->taos_settings.als_cal_target = value;
+	mutex_unlock(&chip->als_mutex);
 
 	return len;
 }
@@ -538,12 +545,15 @@ static ssize_t in_illuminance_calibrate_store(struct device *dev,
 					      const char *buf, size_t len)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct tsl2583_chip *chip = iio_priv(indio_dev);
 	int value;
 
 	if (kstrtoint(buf, 0, &value) || value != 1)
 		return -EINVAL;
 
+	mutex_lock(&chip->als_mutex);
 	taos_als_calibrate(indio_dev);
+	mutex_unlock(&chip->als_mutex);
 
 	return len;
 }
@@ -583,6 +593,8 @@ static ssize_t in_illuminance_lux_table_store(struct device *dev,
 	int value[ARRAY_SIZE(taos_device_lux) * 3 + 1];
 	int n, ret = -EINVAL;
 
+	mutex_lock(&chip->als_mutex);
+
 	get_options(buf, ARRAY_SIZE(value), value);
 
 	/* We now have an array of ints starting at value[1], and
@@ -617,6 +629,8 @@ static ssize_t in_illuminance_lux_table_store(struct device *dev,
 	ret = len;
 
 done:
+	mutex_unlock(&chip->als_mutex);
+
 	return ret;
 }
 
-- 
2.7.4

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#1512175 — Re: [PATCH 10/10] staging: iio: tsl2583: add locking to sysfs attributes

On 28/10/16 11:00, Brian Masney wrote:
> in_illuminance_input_target_show(), in_illuminance_input_target_store(),
> in_illuminance_calibrate_store(), and in_illuminance_lux_table_store()
> accesses data from the tsl2583_chip struct. Some of these fields can be
> modified by other parts of the driver concurrently. This patch adds the
> mutex locking to these sysfs attributes.
> 
> Signed-off-by: Brian Masney <masneyb@onstation.org>
Applied to the togreg branch of iio.git and pushed out as testing for the
autobuilders to play with it.

Some elements of this were probably a little over paranoid but in theory
you might get a wrong reading (compared to what the hardware is set to) so
fair enough.

Good patch set.

Thanks,

Jonathan
> ---
>  drivers/staging/iio/light/tsl2583.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
> index 98afa5b..49b19f5 100644
> --- a/drivers/staging/iio/light/tsl2583.c
> +++ b/drivers/staging/iio/light/tsl2583.c
> @@ -513,8 +513,13 @@ static ssize_t in_illuminance_input_target_show(struct device *dev,
>  {
>  	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>  	struct tsl2583_chip *chip = iio_priv(indio_dev);
> +	int ret;
> +
> +	mutex_lock(&chip->als_mutex);
> +	ret = sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
> +	mutex_unlock(&chip->als_mutex);
>  
> -	return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
> +	return ret;
>  }
>  
>  static ssize_t in_illuminance_input_target_store(struct device *dev,
> @@ -528,7 +533,9 @@ static ssize_t in_illuminance_input_target_store(struct device *dev,
>  	if (kstrtoint(buf, 0, &value) || !value)
>  		return -EINVAL;
>  
> +	mutex_lock(&chip->als_mutex);
>  	chip->taos_settings.als_cal_target = value;
> +	mutex_unlock(&chip->als_mutex);
>  
>  	return len;
>  }
> @@ -538,12 +545,15 @@ static ssize_t in_illuminance_calibrate_store(struct device *dev,
>  					      const char *buf, size_t len)
>  {
>  	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> +	struct tsl2583_chip *chip = iio_priv(indio_dev);
>  	int value;
>  
>  	if (kstrtoint(buf, 0, &value) || value != 1)
>  		return -EINVAL;
>  
> +	mutex_lock(&chip->als_mutex);
>  	taos_als_calibrate(indio_dev);
> +	mutex_unlock(&chip->als_mutex);
>  
>  	return len;
>  }
> @@ -583,6 +593,8 @@ static ssize_t in_illuminance_lux_table_store(struct device *dev,
>  	int value[ARRAY_SIZE(taos_device_lux) * 3 + 1];
>  	int n, ret = -EINVAL;
>  
> +	mutex_lock(&chip->als_mutex);
> +
>  	get_options(buf, ARRAY_SIZE(value), value);
>  
>  	/* We now have an array of ints starting at value[1], and
> @@ -617,6 +629,8 @@ static ssize_t in_illuminance_lux_table_store(struct device *dev,
>  	ret = len;
>  
>  done:
> +	mutex_unlock(&chip->als_mutex);
> +
>  	return ret;
>  }
>  
> 

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