[PATCH 09/10] iio: gyro: adis16136: rework locks using ADIS library's state lock

[Alexandru Ardelean]

This replaces indio_dev's mlock with the state lock/mutex from the ADIS
library.

The __adis16136_get_freq() function has been prefixed to mark it as
unlocked. The adis16136_{set,get}_filter() functions now hold the state
lock for all the ops that they do.

Signed-off-by: Alexandru Ardelean <alexandru.ardel...@analog.com>
---
 drivers/iio/gyro/adis16136.c | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/gyro/adis16136.c b/drivers/iio/gyro/adis16136.c
index 5bec7ad53d8b..2d2c48f0b996 100644
--- a/drivers/iio/gyro/adis16136.c
+++ b/drivers/iio/gyro/adis16136.c
@@ -185,12 +185,12 @@ static int adis16136_set_freq(struct adis16136 
*adis16136, unsigned int freq)
        return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, t);
 }
 
-static int adis16136_get_freq(struct adis16136 *adis16136, unsigned int *freq)
+static int __adis16136_get_freq(struct adis16136 *adis16136, unsigned int 
*freq)
 {
        uint16_t t;
        int ret;
 
-       ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
+       ret = __adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
        if (ret < 0)
                return ret;
 
@@ -224,10 +224,13 @@ static ssize_t adis16136_read_frequency(struct device 
*dev,
 {
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
        struct adis16136 *adis16136 = iio_priv(indio_dev);
+       struct mutex *slock = &adis16136->adis.state_lock;
        unsigned int freq;
        int ret;
 
-       ret = adis16136_get_freq(adis16136, &freq);
+       mutex_lock(slock);
+       ret = __adis16136_get_freq(adis16136, &freq);
+       mutex_unlock(slock);
        if (ret < 0)
                return ret;
 
@@ -252,42 +255,50 @@ static const unsigned adis16136_3db_divisors[] = {
 static int adis16136_set_filter(struct iio_dev *indio_dev, int val)
 {
        struct adis16136 *adis16136 = iio_priv(indio_dev);
+       struct mutex *slock = &adis16136->adis.state_lock;
        unsigned int freq;
        int i, ret;
 
-       ret = adis16136_get_freq(adis16136, &freq);
+       mutex_lock(slock);
+       ret = __adis16136_get_freq(adis16136, &freq);
        if (ret < 0)
-               return ret;
+               goto out_unlock;
 
        for (i = ARRAY_SIZE(adis16136_3db_divisors) - 1; i >= 1; i--) {
                if (freq / adis16136_3db_divisors[i] >= val)
                        break;
        }
 
-       return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, i);
+       ret = __adis_write_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, i);
+out_unlock:
+       mutex_unlock(slock);
+
+       return ret;
 }
 
 static int adis16136_get_filter(struct iio_dev *indio_dev, int *val)
 {
        struct adis16136 *adis16136 = iio_priv(indio_dev);
+       struct mutex *slock = &adis16136->adis.state_lock;
        unsigned int freq;
        uint16_t val16;
        int ret;
 
-       mutex_lock(&indio_dev->mlock);
+       mutex_lock(slock);
 
-       ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, &val16);
+       ret = __adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT,
+                                &val16);
        if (ret < 0)
                goto err_unlock;
 
-       ret = adis16136_get_freq(adis16136, &freq);
+       ret = __adis16136_get_freq(adis16136, &freq);
        if (ret < 0)
                goto err_unlock;
 
        *val = freq / adis16136_3db_divisors[val16 & 0x07];
 
 err_unlock:
-       mutex_unlock(&indio_dev->mlock);
+       mutex_unlock(slock);
 
        return ret ? ret : IIO_VAL_INT;
 }
-- 
2.20.1