Staging: iio: adt7316: Add an extra check for 'ret' equals to 0

ret = 0 indicates a case of no error but no data read from
the bus which is an invalid case. This case doesn't ever happen
in reality. It should perhaps be handled for correctness though.

Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/staging/iio/addac/adt7316-i2c.c b/drivers/staging/iio/addac/adt7316-i2c.c
index 856bcfa60c6c47220984ea16fb3fae1aa62ba21f..473e5e34ec0032ce94425dace224d933892efa32 100644 (file)
--- a/drivers/staging/iio/addac/adt7316-i2c.c
+++ b/drivers/staging/iio/addac/adt7316-i2c.c
@@ -30,6 +30,10 @@ static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
        }
 
        ret = i2c_smbus_read_byte(client);
+
+       if (!ret)
+               return -EIO;
+
        if (ret < 0) {
                dev_err(&cl->dev, "I2C read error\n");
                return ret;