Return a boolean value in st_sensors_new_samples_available routine in
order to avoid an infinite loop in st_sensors_irq_thread if
stat_drdy.addr is not defined or stat_drdy read fails
Fixes: 90efe05562921 ("iio: st_sensors: harden interrupt handling")
Reported-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
---
This patch is just compile tested, I have not carried out any run test
---
.../common/st_sensors/st_sensors_trigger.c | 20 ++++++++-----------
1 file changed, 8 insertions(+), 12 deletions(-)
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
index 0507283bd4c1..3bee5c9255d4 100644
--- a/drivers/iio/common/st_sensors/st_sensors_trigger.c
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -23,35 +23,31 @@
* @sdata: Sensor data.
*
* returns:
- * 0 - no new samples available
- * 1 - new samples available
- * negative - error or unknown
+ * false - no new samples available or read error
+ * true - new samples available
*/
-static int st_sensors_new_samples_available(struct iio_dev *indio_dev,
- struct st_sensor_data *sdata)
+static bool st_sensors_new_samples_available(struct iio_dev *indio_dev,
+ struct st_sensor_data *sdata)
{
int ret, status;
/* How would I know if I can't check it? */
if (!sdata->sensor_settings->drdy_irq.stat_drdy.addr)
- return -EINVAL;
+ return false;
/* No scan mask, no interrupt */
if (!indio_dev->active_scan_mask)
- return 0;
+ return false;
ret = regmap_read(sdata->regmap,
sdata->sensor_settings->drdy_irq.stat_drdy.addr,
&status);
if (ret < 0) {
dev_err(sdata->dev, "error checking samples available\n");
- return ret;
+ return false;
}
- if (status & sdata->sensor_settings->drdy_irq.stat_drdy.mask)
- return 1;
-
- return 0;
+ return !!(status & sdata->sensor_settings->drdy_irq.stat_drdy.mask);
}
/**
--
2.26.2
