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iio: adc: sc27xx_adc: do not use internal iio_dev lock

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The iio_device lock is only meant for internal use. Hence define a
device local lock to protect against concurrent accesses.

While at it, properly include "mutex.h" for mutex related APIs.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20221004134909.1692021-9-nuno.sa@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sá 2022-10-04 15:49:01 +02:00 committed by Jonathan Cameron
parent bb690935df
commit 8433aa3591
1 changed files with 10 additions and 4 deletions
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14
drivers/iio/adc/sc27xx_adc.c
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@ -4,6 +4,7 @@
#include <linux/hwspinlock.h>
#include <linux/iio/iio.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/of_device.h>
@ -83,6 +84,8 @@ struct sc27xx_adc_data {
struct device *dev;
struct regulator *volref;
struct regmap *regmap;
/* lock to protect against multiple access to the device */
struct mutex lock;
/*
* One hardware spinlock to synchronize between the multiple
* subsystems which will access the unique ADC controller.
@ -664,9 +667,9 @@ static int sc27xx_adc_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&indio_dev->mlock);
mutex_lock(&data->lock);
ret = sc27xx_adc_read(data, chan->channel, scale, &tmp);
mutex_unlock(&indio_dev->mlock);
mutex_unlock(&data->lock);
if (ret)
return ret;
@ -675,10 +678,10 @@ static int sc27xx_adc_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_PROCESSED:
mutex_lock(&indio_dev->mlock);
mutex_lock(&data->lock);
ret = sc27xx_adc_read_processed(data, chan->channel, scale,
&tmp);
mutex_unlock(&indio_dev->mlock);
mutex_unlock(&data->lock);
if (ret)
return ret;
@ -934,6 +937,9 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
indio_dev->info = &sc27xx_info;
indio_dev->channels = sc27xx_channels;
indio_dev->num_channels = ARRAY_SIZE(sc27xx_channels);
mutex_init(&sc27xx_data->lock);
ret = devm_iio_device_register(dev, indio_dev);
if (ret)
dev_err(dev, "could not register iio (ADC)");