iio: frequency: adf4350: 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.
The lock protect the state of the device from potential concurrent writes.
The device is configured via a sequence of SPI writes, and this lock is
meant to prevent the start of another sequence before another one has
finished.

This is part of a bigger cleanup.
Link: https://lore.kernel.org/linux-iio/CA+U=Dsoo6YABe5ODLp+eFNPGFDjk5ZeQEceGkqjxXcVEhLWubw@mail.gmail.com/
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20200916092731.77220-1-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index 409c9c4..82c050a 100644 (file)
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -48,6 +48,13 @@ struct adf4350_state {
        unsigned long                   regs_hw[6];
        unsigned long long              freq_req;
        /*
+        * Lock to protect the state of the device from potential concurrent
+        * writes. The device is configured via a sequence of SPI writes,
+        * and this lock is meant to prevent the start of another sequence
+        * before another one has finished.
+        */
+       struct mutex                    lock;
+       /*
         * DMA (thus cache coherency maintenance) requires the
         * transfer buffers to live in their own cache lines.
         */
@@ -99,7 +106,7 @@ 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 +114,7 @@ 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 +261,7 @@ 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 +302,7 @@ 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 +316,7 @@ 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 +345,7 @@ 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 +546,8 @@ 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;