[PATCH] iio: dac: vf610_dac: Replace indio_dev->mlock with own device lock

[Sergiu Cuciurean <sergiu.cuciurean@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 drivers/iio/dac/vf610_dac.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/dac/vf610_dac.c b/drivers/iio/dac/vf610_dac.c
index 71f8a5c471c4..c1e15ede0e8e 100644
--- a/drivers/iio/dac/vf610_dac.c
+++ b/drivers/iio/dac/vf610_dac.c
@@ -36,6 +36,7 @@ struct vf610_dac {
 	struct device *dev;
 	enum vf610_conversion_mode_sel conv_mode;
 	void __iomem *regs;
+	struct mutex lock;
 };
 
 static void vf610_dac_init(struct vf610_dac *info)
@@ -64,7 +65,7 @@ static int vf610_set_conversion_mode(struct iio_dev *indio_dev,
 	struct vf610_dac *info = iio_priv(indio_dev);
 	int val;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(&info->lock);
 	info->conv_mode = mode;
 	val = readl(info->regs + VF610_DACx_STATCTRL);
 	if (mode)
@@ -72,7 +73,7 @@ static int vf610_set_conversion_mode(struct iio_dev *indio_dev,
 	else
 		val &= ~VF610_DAC_LPEN;
 	writel(val, info->regs + VF610_DACx_STATCTRL);
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(&info->lock);
 
 	return 0;
 }
@@ -147,9 +148,9 @@ static int vf610_write_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(&info->lock);
 		writel(VF610_DAC_DAT0(val), info->regs);
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(&info->lock);
 		return 0;
 
 	default:
@@ -205,6 +206,8 @@ static int vf610_dac_probe(struct platform_device *pdev)
 	indio_dev->channels = vf610_dac_iio_channels;
 	indio_dev->num_channels = ARRAY_SIZE(vf610_dac_iio_channels);
 
+	mutex_init(&info->lock);
+
 	ret = clk_prepare_enable(info->clk);
 	if (ret) {
 		dev_err(&pdev->dev,
-- 
2.17.1