4.9-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 38cd989ee38c16388cde89db5b734f9d55b905f9 ]
The current register (04h) has a sign bit at MSB. The comments for this calculation also mention that it's a signed register.
However, the regval is unsigned type so result of calculation turns out to be an incorrect value when current is negative.
This patch simply fixes this by adding a casting to s16.
Fixes: 5d389b125186c ("hwmon: (ina2xx) Make calibration register value fixed") Signed-off-by: Nicolin Chen nicoleotsuka@gmail.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwmon/ina2xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c index 9ac6e1673375..1f291b344178 100644 --- a/drivers/hwmon/ina2xx.c +++ b/drivers/hwmon/ina2xx.c @@ -273,7 +273,7 @@ static int ina2xx_get_value(struct ina2xx_data *data, u8 reg, break; case INA2XX_CURRENT: /* signed register, result in mA */ - val = regval * data->current_lsb_uA; + val = (s16)regval * data->current_lsb_uA; val = DIV_ROUND_CLOSEST(val, 1000); break; case INA2XX_CALIBRATION: