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Subject[PATCH 10/10] iio: imu: adis16480: use state lock for filter freq set
Date
It's the only operation that does 2 operations (a read & a write), so the
unlocked functions can be used under a single state lock.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
drivers/iio/imu/adis16480.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
index dc13d8a33612..01dae50e985b 100644
--- a/drivers/iio/imu/adis16480.c
+++ b/drivers/iio/imu/adis16480.c
@@ -550,6 +550,7 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, unsigned int freq)
{
struct adis16480 *st = iio_priv(indio_dev);
+ struct mutex *slock = &st->adis.state_lock;
unsigned int enable_mask, offset, reg;
unsigned int diff, best_diff;
unsigned int i, best_freq;
@@ -560,9 +561,11 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
offset = ad16480_filter_data[chan->scan_index][1];
enable_mask = BIT(offset + 2);

- ret = adis_read_reg_16(&st->adis, reg, &val);
+ mutex_lock(slock);
+
+ ret = __adis_read_reg_16(&st->adis, reg, &val);
if (ret < 0)
- return ret;
+ goto out_unlock;

if (freq == 0) {
val &= ~enable_mask;
@@ -584,7 +587,11 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
val |= enable_mask;
}

- return adis_write_reg_16(&st->adis, reg, val);
+ ret = __adis_write_reg_16(&st->adis, reg, val);
+out_unlock:
+ mutex_unlock(slock);
+
+ return ret;
}

static int adis16480_read_raw(struct iio_dev *indio_dev,
--
2.20.1
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