[PATCH] iio: frequency: adf4350: Replace indio_dev->mlock with own device lock

[Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>]

From: 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>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---
 drivers/iio/frequency/adf4350.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index 409c9c47161e..3f37a57cd3c3 100644
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -47,6 +47,7 @@ struct adf4350_state {
 	unsigned long			regs[6];
 	unsigned long			regs_hw[6];
 	unsigned long long		freq_req;
+	struct mutex			lock;
 	/*
 	 * DMA (thus cache coherency maintenance) requires the
 	 * transfer buffers to live in their own cache lines.
@@ -99,7 +100,7 @@ static int adf4350_reg_access(struct iio_dev *indio_dev,
 	if (reg > ADF4350_REG5)
 		return -EINVAL;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(&st->lock);
 	if (readval == NULL) {
 		st->regs[reg] = writeval & ~(BIT(0) | BIT(1) | BIT(2));
 		ret = adf4350_sync_config(st);
@@ -107,7 +108,7 @@ static int adf4350_reg_access(struct iio_dev *indio_dev,
 		*readval =  st->regs_hw[reg];
 		ret = 0;
 	}
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(&st->lock);
 
 	return ret;
 }
@@ -254,7 +255,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
 	if (ret)
 		return ret;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(&st->lock);
 	switch ((u32)private) {
 	case ADF4350_FREQ:
 		ret = adf4350_set_freq(st, readin);
@@ -295,7 +296,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
 	default:
 		ret = -EINVAL;
 	}
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(&st->lock);
 
 	return ret ? ret : len;
 }
@@ -309,7 +310,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
 	unsigned long long val;
 	int ret = 0;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(&st->lock);
 	switch ((u32)private) {
 	case ADF4350_FREQ:
 		val = (u64)((st->r0_int * st->r1_mod) + st->r0_fract) *
@@ -338,7 +339,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
 		ret = -EINVAL;
 		val = 0;
 	}
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(&st->lock);
 
 	return ret < 0 ? ret : sprintf(buf, "%llu\n", val);
 }
@@ -539,6 +540,8 @@ static int adf4350_probe(struct spi_device *spi)
 	indio_dev->channels = &adf4350_chan;
 	indio_dev->num_channels = 1;
 
+	mutex_init(&st->lock);
+
 	st->chspc = pdata->channel_spacing;
 	if (clk) {
 		st->clk = clk;
-- 
2.25.1