[patch 2/2] Staging: iio: unlock on error paths

[Dan Carpenter <error27@gmail.com>]

hmc5843_set_operating_mode() and set_range() didn't unlock on error
paths.

Also in hmc5843_set_operating_mode() it wasn't clear if we should return
"status", "error" or "count" so I changed it all to return "ret" and
then for consistency I did the same for set_range().

I also changed it to propagate the error codes from lower levels instead
of simply returning -EINVAL for everything.

Signed-off-by: Dan Carpenter <error27@gmail.com>

diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
index 3d3bac4..7c52038 100644
--- a/drivers/staging/iio/magnetometer/hmc5843.c
+++ b/drivers/staging/iio/magnetometer/hmc5843.c
@@ -216,26 +216,28 @@ static ssize_t hmc5843_set_operating_mode(struct device *dev,
 	struct hmc5843_data *data = indio_dev->dev_data;
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	unsigned long operating_mode = 0;
-	s32 status;
-	int error;
+	ssize_t ret = 0;
+
 	mutex_lock(&data->lock);
-	error = strict_strtoul(buf, 10, &operating_mode);
-	if (error)
-		return error;
+	ret = strict_strtoul(buf, 10, &operating_mode);
+	if (ret)
+		goto exit;
 	dev_dbg(dev, "set Conversion mode to %lu\n", operating_mode);
-	if (operating_mode > MODE_SLEEP)
-			return -EINVAL;
+	if (operating_mode > MODE_SLEEP) {
+		ret = -EINVAL;
+		goto exit;
+	}
 
-	status = i2c_smbus_write_byte_data(client, this_attr->address,
+	ret = i2c_smbus_write_byte_data(client, this_attr->address,
 					operating_mode);
-	if (status) {
-		count = -EINVAL;
+	if (ret)
 		goto exit;
-	}
 	data->operating_mode = operating_mode;
 
 exit:
 	mutex_unlock(&data->lock);
+	if (!ret)
+		ret = count;
 	return count;
 }
 static IIO_DEVICE_ATTR(operating_mode,
@@ -434,24 +436,27 @@ static ssize_t set_range(struct device *dev,
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	struct hmc5843_data *data = indio_dev->dev_data;
 	unsigned long range = 0;
-	int error;
+	ssize_t ret;
+
 	mutex_lock(&data->lock);
-	error = strict_strtoul(buf, 10, &range);
-	if (error)
-		return error;
+	ret = strict_strtoul(buf, 10, &range);
+	if (ret)
+		goto exit;
 	dev_dbg(dev, "set range to %lu\n", range);
-
-	if (range > RANGE_6_5)
-		return -EINVAL;
+	if (range > RANGE_6_5) {
+		ret = -EINVAL;
+		goto exit;
+	}
 
 	data->range = range;
 	range = range << RANGE_GAIN_OFFSET;
-	if (i2c_smbus_write_byte_data(client, this_attr->address, range))
-		count = -EINVAL;
+	ret = i2c_smbus_write_byte_data(client, this_attr->address, range);
 
+exit:
 	mutex_unlock(&data->lock);
-	return count;
-
+	if (!ret)
+		ret = count;
+	return ret;
 }
 static IIO_DEVICE_ATTR(magn_range,
 			S_IWUSR | S_IRUGO,