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author | Nuno Sá <nuno.sa@analog.com> | 2022-10-04 15:49:01 +0200 |
---|---|---|
committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-11-23 19:43:58 +0000 |
commit | 8433aa3591afff6f4dc641a2e274e6171f66a4b7 (patch) | |
tree | a4ed457a052ee17ef2a94306c0de418f41b2dac3 /drivers/iio/adc | |
parent | bb690935df8dd8f97612b422c669bd1a5fe87096 (diff) | |
download | linux-stable-8433aa3591afff6f4dc641a2e274e6171f66a4b7.tar.gz linux-stable-8433aa3591afff6f4dc641a2e274e6171f66a4b7.tar.bz2 linux-stable-8433aa3591afff6f4dc641a2e274e6171f66a4b7.zip |
iio: adc: sc27xx_adc: do not use internal iio_dev lock
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>
Diffstat (limited to 'drivers/iio/adc')
-rw-r--r-- | drivers/iio/adc/sc27xx_adc.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c index f8421cbba8fa..ff1fc329bb9b 100644 --- a/drivers/iio/adc/sc27xx_adc.c +++ b/drivers/iio/adc/sc27xx_adc.c @@ -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)"); |