[PATCH 03/15] iio: adc: axp288_adc: do not use internal iio_dev lock

Nuno Sá
2022-09-20T11:29:50Z

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

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
drivers/iio/adc/axp288_adc.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/axp288_adc.c b/drivers/iio/adc/axp288_adc.c
index 580361bd9849..3bbb96156739 100644
--- a/drivers/iio/adc/axp288_adc.c
+++ b/drivers/iio/adc/axp288_adc.c
@@ -9,6 +9,7 @@

#include <linux/dmi.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/regmap.h>
@@ -50,6 +51,8 @@ enum axp288_adc_id {
struct axp288_adc_info {
int irq;
struct regmap *regmap;
+ /* lock to protect against multiple access to the device */
+ struct mutex lock;
bool ts_enabled;
};

@@ -161,7 +164,7 @@ static int axp288_adc_read_raw(struct iio_dev *indio_dev,
int ret;
struct axp288_adc_info *info = iio_priv(indio_dev);

- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&info->lock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (axp288_adc_set_ts(info, AXP288_ADC_TS_CURRENT_ON_ONDEMAND,
@@ -178,7 +181,7 @@ static int axp288_adc_read_raw(struct iio_dev *indio_dev,
default:
ret = -EINVAL;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&info->lock);

return ret;
}
@@ -264,6 +267,7 @@ static int axp288_adc_probe(struct platform_device *pdev)
return -ENOMEM;

info = iio_priv(indio_dev);
+ mutex_init(&info->lock);
info->irq = platform_get_irq(pdev, 0);
if (info->irq < 0)
return info->irq;
--
2.37.3