iio: adc: ti-ads1018: fix type overflow for data rate

The variable 'drate' is currently defined as u8. However, the data rate
values in ads1018 can reach up to 3300 Hz, which exceeds the maximum
value of 255 that a u8 can hold.

Change the type of 'drate' to u32 to match the data_rate_mode_to_hz
array definition and ensure the data rate is handled correctly.

Fixes: bf0bba486b5b ("iio: adc: Add ti-ads1018 driver")
Signed-off-by: Chunyang Chen <chenchunyang0908@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Kurt Borja <kuurtb@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ti-ads1018.c b/drivers/iio/adc/ti-ads1018.c
index 6246b3cab71fd9887ef0f47fe3de99111bf9db15..0780abd0d0db42b1f3895c7ae74c50c8c5207db3 100644 (file)
--- a/drivers/iio/adc/ti-ads1018.c
+++ b/drivers/iio/adc/ti-ads1018.c
@@ -249,7 +249,7 @@ static int ads1018_single_shot(struct ads1018 *ads1018,
                               struct iio_chan_spec const *chan, u16 *cnv)
 {
        u8 max_drate_mode = ads1018->chip_info->num_data_rate_mode_to_hz - 1;
-       u8 drate = ads1018->chip_info->data_rate_mode_to_hz[max_drate_mode];
+       u32 drate = ads1018->chip_info->data_rate_mode_to_hz[max_drate_mode];
        u8 pga_mode = ads1018->chan_data[chan->scan_index].pga_mode;
        struct spi_transfer xfer[2] = {
                {