hwmon: (ads1015) Handle negative conversion values correctly

[ Upstream commit acc146943957d7418a6846f06e029b2c5e87e0d5 ]

Make the divisor signed as DIV_ROUND_CLOSEST is undefined for negative
dividends when the divisor is unsigned.

Signed-off-by: Peter Rosin <peda@axentia.se>
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c
index f155b83..2b3105c 100644 (file)
--- a/drivers/hwmon/ads1015.c
+++ b/drivers/hwmon/ads1015.c
@@ -126,7 +126,7 @@ static int ads1015_reg_to_mv(struct i2c_client *client, unsigned int channel,
        struct ads1015_data *data = i2c_get_clientdata(client);
        unsigned int pga = data->channel_data[channel].pga;
        int fullscale = fullscale_table[pga];
-       const unsigned mask = data->id == ads1115 ? 0x7fff : 0x7ff0;
+       const int mask = data->id == ads1115 ? 0x7fff : 0x7ff0;
 
        return DIV_ROUND_CLOSEST(reg * fullscale, mask);
 }