iio: light: veml6030: fix IIO device retrieval from embedded device

The dev pointer that is received as an argument in the
in_illuminance_period_available_show function references the device
embedded in the IIO device, not in the i2c client.

dev_to_iio_dev() must be used to accessthe right data. The current
implementation leads to a segmentation fault on every attempt to read
the attribute because indio_dev gets a NULL assignment.

This bug has been present since the first appearance of the driver,
apparently since the last version (V6) before getting applied. A
constant attribute was used until then, and the last modifications might
have not been tested again.

Cc: stable@vger.kernel.org
Fixes: 7b779f573c48 ("iio: light: add driver for veml6030 ambient light sensor")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20240913-veml6035-v1-3-0b09c0c90418@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/light/veml6030.c b/drivers/iio/light/veml6030.c
index 2e86d310952ede41925431d838e70c1ba4fae386..df2ba3078b912afbe8087f71218fc316d552169a 100644 (file)
--- a/drivers/iio/light/veml6030.c
+++ b/drivers/iio/light/veml6030.c
@@ -99,9 +99,8 @@ static const char * const period_values[] = {
 static ssize_t in_illuminance_period_available_show(struct device *dev,
                                struct device_attribute *attr, char *buf)
 {
+       struct veml6030_data *data = iio_priv(dev_to_iio_dev(dev));
        int ret, reg, x;
-       struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
-       struct veml6030_data *data = iio_priv(indio_dev);
 
        ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, &reg);
        if (ret) {