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Date: Sun, 9 Jul 2017 18:47:28 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Brian Masney <masneyb@...tation.org>
Cc: linux-iio@...r.kernel.org, gregkh@...uxfoundation.org,
devel@...verdev.osuosl.org, knaack.h@....de, lars@...afoo.de,
pmeerw@...erw.net, linux-kernel@...r.kernel.org,
Jon.Brenner@....com
Subject: Re: [PATCH v2 9/9] staging: iio: tsl2x7x: check return value from
tsl2x7x_invoke_change()
On Thu, 6 Jul 2017 18:56:26 -0400
Brian Masney <masneyb@...tation.org> wrote:
> The return value from tsl2x7x_invoke_change() was not checked in most
> places in the driver. This patch adds the proper error checks. The
> return values inside tsl2x7x_invoke_change() are now checked by
> this patch as well.
>
> Previously, if there was an error turning the chip back on, then the
> driver would attempt to turn the chip off and incorrectly return
> success. The code to power off the chip is removed by this patch
> since we should fail fast.
>
> Signed-off-by: Brian Masney <masneyb@...tation.org>
This went on cleanly even without patch 8 so:
Applied to the togreg branch of iio.git and pushed out as testing.
Another good set Brian, looking forward to the next one!
Jonathan
> ---
> drivers/staging/iio/light/tsl2x7x.c | 55 +++++++++++++++++++++++++------------
> 1 file changed, 37 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
> index 033468d..c00278d 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -771,22 +771,24 @@ int tsl2x7x_invoke_change(struct iio_dev *indio_dev)
> {
> struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> int device_status = chip->tsl2x7x_chip_status;
> + int ret;
>
> mutex_lock(&chip->als_mutex);
> mutex_lock(&chip->prox_mutex);
>
> - if (device_status == TSL2X7X_CHIP_WORKING)
> - tsl2x7x_chip_off(indio_dev);
> -
> - tsl2x7x_chip_on(indio_dev);
> + if (device_status == TSL2X7X_CHIP_WORKING) {
> + ret = tsl2x7x_chip_off(indio_dev);
> + if (ret < 0)
> + goto unlock;
> + }
>
> - if (device_status != TSL2X7X_CHIP_WORKING)
> - tsl2x7x_chip_off(indio_dev);
> + ret = tsl2x7x_chip_on(indio_dev);
>
> +unlock:
> mutex_unlock(&chip->prox_mutex);
> mutex_unlock(&chip->als_mutex);
>
> - return 0;
> + return ret;
> }
>
> static
> @@ -925,6 +927,7 @@ static ssize_t in_illuminance0_target_input_store(struct device *dev,
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> unsigned long value;
> + int ret;
>
> if (kstrtoul(buf, 0, &value))
> return -EINVAL;
> @@ -932,7 +935,9 @@ static ssize_t in_illuminance0_target_input_store(struct device *dev,
> if (value)
> chip->tsl2x7x_settings.als_cal_target = value;
>
> - tsl2x7x_invoke_change(indio_dev);
> + ret = tsl2x7x_invoke_change(indio_dev);
> + if (ret < 0)
> + return ret;
>
> return len;
> }
> @@ -981,7 +986,9 @@ static ssize_t in_intensity0_thresh_period_store(struct device *dev,
> dev_info(&chip->client->dev, "%s: als persistence = %d",
> __func__, filter_delay);
>
> - tsl2x7x_invoke_change(indio_dev);
> + ret = tsl2x7x_invoke_change(indio_dev);
> + if (ret < 0)
> + return ret;
>
> return IIO_VAL_INT_PLUS_MICRO;
> }
> @@ -1029,7 +1036,10 @@ static ssize_t in_proximity0_thresh_period_store(struct device *dev,
> dev_info(&chip->client->dev, "%s: prox persistence = %d",
> __func__, filter_delay);
>
> - tsl2x7x_invoke_change(indio_dev);
> + ret = tsl2x7x_invoke_change(indio_dev);
> + if (ret < 0)
> + return ret;
> +
>
> return IIO_VAL_INT_PLUS_MICRO;
> }
> @@ -1040,6 +1050,7 @@ static ssize_t in_illuminance0_calibrate_store(struct device *dev,
> {
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> bool value;
> + int ret;
>
> if (strtobool(buf, &value))
> return -EINVAL;
> @@ -1047,7 +1058,9 @@ static ssize_t in_illuminance0_calibrate_store(struct device *dev,
> if (value)
> tsl2x7x_als_calibrate(indio_dev);
>
> - tsl2x7x_invoke_change(indio_dev);
> + ret = tsl2x7x_invoke_change(indio_dev);
> + if (ret < 0)
> + return ret;
>
> return len;
> }
> @@ -1087,7 +1100,7 @@ static ssize_t in_illuminance0_lux_table_store(struct device *dev,
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> int value[ARRAY_SIZE(chip->tsl2x7x_device_lux) * 3 + 1];
> - int n;
> + int n, ret;
>
> get_options(buf, ARRAY_SIZE(value), value);
>
> @@ -1115,7 +1128,9 @@ static ssize_t in_illuminance0_lux_table_store(struct device *dev,
> memset(chip->tsl2x7x_device_lux, 0, sizeof(chip->tsl2x7x_device_lux));
> memcpy(chip->tsl2x7x_device_lux, &value[1], (value[0] * 4));
>
> - tsl2x7x_invoke_change(indio_dev);
> + ret = tsl2x7x_invoke_change(indio_dev);
> + if (ret < 0)
> + return ret;
>
> return len;
> }
> @@ -1126,6 +1141,7 @@ static ssize_t in_proximity0_calibrate_store(struct device *dev,
> {
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> bool value;
> + int ret;
>
> if (strtobool(buf, &value))
> return -EINVAL;
> @@ -1133,7 +1149,9 @@ static ssize_t in_proximity0_calibrate_store(struct device *dev,
> if (value)
> tsl2x7x_prox_cal(indio_dev);
>
> - tsl2x7x_invoke_change(indio_dev);
> + ret = tsl2x7x_invoke_change(indio_dev);
> + if (ret < 0)
> + return ret;
>
> return len;
> }
> @@ -1161,6 +1179,7 @@ static int tsl2x7x_write_interrupt_config(struct iio_dev *indio_dev,
> int val)
> {
> struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> + int ret;
>
> if (chan->type == IIO_INTENSITY) {
> if (val)
> @@ -1174,7 +1193,9 @@ static int tsl2x7x_write_interrupt_config(struct iio_dev *indio_dev,
> chip->tsl2x7x_settings.interrupts_en &= 0x10;
> }
>
> - tsl2x7x_invoke_change(indio_dev);
> + ret = tsl2x7x_invoke_change(indio_dev);
> + if (ret < 0)
> + return ret;
>
> return 0;
> }
> @@ -1422,9 +1443,7 @@ static int tsl2x7x_write_raw(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> - tsl2x7x_invoke_change(indio_dev);
> -
> - return 0;
> + return tsl2x7x_invoke_change(indio_dev);
> }
>
> static DEVICE_ATTR_RO(in_proximity0_calibscale_available);
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