From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
commit af0e1871d79cfbb91f732d2c6fa7558e45c31038 upstream.
The lux_val returned from tsl2583_get_lux can potentially be zero,
so check for this to avoid a division by zero and an overflowed
gain_trim_val.
Fixes clang scan-build warning:
drivers/iio/light/tsl2583.c:345:40: warning: Either the
condition 'lux_val<0' is redundant or there is division
by zero at line 345. [zerodivcond]
Fixes: ac4f6eee8fe8 ("staging: iio: TAOS tsl258x: Device driver")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
[iwamatsu: Change file path.]
[Colin Ian King: minor context adjustments for 4.9.y]
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@xxxxxxxxxxxxx>
---
drivers/staging/iio/light/tsl2583.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
index 08f1583ee34e..fb3ec56d45b6 100644
--- a/drivers/staging/iio/light/tsl2583.c
+++ b/drivers/staging/iio/light/tsl2583.c
@@ -382,6 +382,15 @@ static int taos_als_calibrate(struct iio_dev *indio_dev)
dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
return lux_val;
}
+
+ /* Avoid division by zero of lux_value later on */
+ if (lux_val == 0) {
+ dev_err(&chip->client->dev,
+ "%s: lux_val of 0 will produce out of range trim_value\n",
+ __func__);
+ return -ENODATA;
+ }
+
gain_trim_val = (unsigned int)(((chip->taos_settings.als_cal_target)
* chip->taos_settings.als_gain_trim) / lux_val);
--
2.31.1
