The check for ch1lux > ch0lux inside tsl2583_get_lux is only valid if the ratio is not equal to zero. Move the code block inside the else statement. This does away with the need to initialize the variables to zero. Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx> --- drivers/staging/iio/light/tsl2583.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c index 8d9176d..5cdfe06 100644 --- a/drivers/staging/iio/light/tsl2583.c +++ b/drivers/staging/iio/light/tsl2583.c @@ -167,8 +167,6 @@ static int tsl2583_get_lux(struct iio_dev *indio_dev) struct tsl2583_lux *p; struct tsl2583_chip *chip = iio_priv(indio_dev); int i, ret; - u32 ch0lux = 0; - u32 ch1lux = 0; ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG); if (ret < 0) { @@ -238,22 +236,25 @@ static int tsl2583_get_lux(struct iio_dev *indio_dev) if (p->ratio == 0) { lux = 0; } else { + u32 ch0lux, ch1lux; + ch0lux = ((ch0 * p->ch0) + (gainadj[chip->als_settings.als_gain].ch0 >> 1)) / gainadj[chip->als_settings.als_gain].ch0; ch1lux = ((ch1 * p->ch1) + (gainadj[chip->als_settings.als_gain].ch1 >> 1)) / gainadj[chip->als_settings.als_gain].ch1; - lux = ch0lux - ch1lux; - } - /* note: lux is 31 bit max at this point */ - if (ch1lux > ch0lux) { - dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n", - __func__); - ret = 0; - chip->als_cur_info.lux = 0; - goto done; + /* note: lux is 31 bit max at this point */ + if (ch1lux > ch0lux) { + dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n", + __func__); + ret = 0; + chip->als_cur_info.lux = 0; + goto done; + } + + lux = ch0lux - ch1lux; } /* adjust for active time scale */ -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html