lkml.org 
[lkml]   [2016]   [Oct]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 10/10] staging: iio: tsl2583: add locking to sysfs attributes
From
Date
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;
> }
>
>

\
 
 \ /
  Last update: 2016-10-30 19:44    [W:0.128 / U:1.940 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site