hwmon: (pmbus/ina233) Add error check for pmbus_read_word_data() return value

ina233_read_word_data() uses the return value of pmbus_read_word_data()
directly in a DIV_ROUND_CLOSEST() computation without first checking for
errors. If the underlying I2C transaction fails, a negative error code is
used in the arithmetic, producing a garbage sensor value instead of
propagating the error.

Add the missing error check before using the return value.

Fixes: b64b6cb ("hwmon: Add driver for TI INA233 Current and Power Monitor")
Cc: [email protected]
Signed-off-by: Sanman Pradhan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: Sanman Pradhan

drivers/hwmon/pmbus/ina233.c

@@ -67,6 +67,8 @@ static int ina233_read_word_data(struct i2c_client *client, int page,
 	switch (reg) {
 	case PMBUS_VIRT_READ_VMON:
 		ret = pmbus_read_word_data(client, 0, 0xff, MFR_READ_VSHUNT);
+		if (ret < 0)
+			return ret;
 
 		/* Adjust returned value to match VIN coefficients */
 		/* VIN: 1.25 mV VSHUNT: 2.5 uV LSB */