iio: dac: ad5761: Replace indio_dev->mlock with own device lock

As part of the general cleanup of indio_dev->mlock, this change replaces
it with a local lock on the device's state structure.

Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/dac/ad5761.c b/drivers/iio/dac/ad5761.c
index 4fb42b7..6717994 100644 (file)
--- a/drivers/iio/dac/ad5761.c
+++ b/drivers/iio/dac/ad5761.c
@@ -57,11 +57,13 @@ enum ad5761_supported_device_ids {
  * @use_intref:                true when the internal voltage reference is used
  * @vref:              actual voltage reference in mVolts
  * @range:             output range mode used
+ * @lock               lock to protect the data buffer during SPI ops
  * @data:              cache aligned spi buffer
  */
 struct ad5761_state {
        struct spi_device               *spi;
        struct regulator                *vref_reg;
+       struct mutex                    lock;
 
        bool use_intref;
        int vref;
@@ -124,9 +126,9 @@ static int ad5761_spi_write(struct iio_dev *indio_dev, u8 addr, u16 val)
        struct ad5761_state *st = iio_priv(indio_dev);
        int ret;
 
-       mutex_lock(&indio_dev->mlock);
+       mutex_lock(&st->lock);
        ret = _ad5761_spi_write(st, addr, val);
-       mutex_unlock(&indio_dev->mlock);
+       mutex_unlock(&st->lock);
 
        return ret;
 }
@@ -163,9 +165,9 @@ static int ad5761_spi_read(struct iio_dev *indio_dev, u8 addr, u16 *val)
        struct ad5761_state *st = iio_priv(indio_dev);
        int ret;
 
-       mutex_lock(&indio_dev->mlock);
+       mutex_lock(&st->lock);
        ret = _ad5761_spi_read(st, addr, val);
-       mutex_unlock(&indio_dev->mlock);
+       mutex_unlock(&st->lock);
 
        return ret;
 }
@@ -368,6 +370,8 @@ static int ad5761_probe(struct spi_device *spi)
        if (pdata)
                voltage_range = pdata->voltage_range;
 
+       mutex_init(&st->lock);
+
        ret = ad5761_spi_set_range(st, voltage_range);
        if (ret)
                goto disable_regulator_err;