[PATCH v2] staging: iio: ade7753: replace mlock with driver private lock

[simran singhal <singhalsimran0@gmail.com>]

The IIO subsystem is redefining iio_dev->mlock to be used by
the IIO core only for protecting device operating mode changes.
ie. Changes between INDIO_DIRECT_MODE, INDIO_BUFFER_* modes.

In this driver, mlock was being used to protect hardware state
changes.  Replace it with a lock in the devices global data.

Fix some coding style issues related to white space also.

Signed-off-by: simran singhal <singhalsimran0@gmail.com>
---

 v2:
   -Removed new lock to reuse the existing lock

 drivers/staging/iio/meter/ade7753.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/iio/meter/ade7753.c b/drivers/staging/iio/meter/ade7753.c
index dfd8b71..d88eaa3 100644
--- a/drivers/staging/iio/meter/ade7753.c
+++ b/drivers/staging/iio/meter/ade7753.c
@@ -83,10 +83,10 @@
  * @buf_lock:       mutex to protect tx and rx
  **/
 struct ade7753_state {
-	    struct spi_device   *us;
-		    struct mutex        buf_lock;
-			    u8          tx[ADE7753_MAX_TX] ____cacheline_aligned;
-				    u8          rx[ADE7753_MAX_RX];
+	struct spi_device   *us;
+	struct mutex        buf_lock;
+	u8          tx[ADE7753_MAX_TX] ____cacheline_aligned;
+	u8          rx[ADE7753_MAX_RX];
 };
 
 static int ade7753_spi_write_reg_8(struct device *dev,
@@ -484,7 +484,7 @@ static ssize_t ade7753_write_frequency(struct device *dev,
 	if (!val)
 		return -EINVAL;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(&st->buf_lock);
 
 	t = 27900 / val;
 	if (t > 0)
@@ -505,7 +505,7 @@ static ssize_t ade7753_write_frequency(struct device *dev,
 	ret = ade7753_spi_write_reg_16(dev, ADE7753_MODE, reg);
 
 out:
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(&st->buf_lock);
 
 	return ret ? ret : len;
 }
-- 
2.7.4