Make sure that the read function is not interrupted...
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Acked-by: Harald Geyer <harald@xxxxxxxxx>
---
Resending for Richard Weinberger.
No changes since v1 except reordering.
drivers/iio/humidity/dht11.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index f546eca..7717f5c 100644
--- a/drivers/iio/humidity/dht11.c
+++ b/drivers/iio/humidity/dht11.c
@@ -29,6 +29,7 @@
#include <linux/wait.h>
#include <linux/bitops.h>
#include <linux/completion.h>
+#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
@@ -57,6 +58,7 @@ struct dht11 {
int irq;
struct completion completion;
+ struct mutex lock;
s64 timestamp;
int temperature;
@@ -145,6 +147,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev,
struct dht11 *dht11 = iio_priv(iio_dev);
int ret;
+ mutex_lock(&dht11->lock);
if (dht11->timestamp + DHT11_DATA_VALID_TIME < iio_get_time_ns()) {
reinit_completion(&dht11->completion);
@@ -185,6 +188,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev,
ret = -EINVAL;
err:
dht11->num_edges = -1;
+ mutex_unlock(&dht11->lock);
return ret;
}
@@ -268,6 +272,7 @@ static int dht11_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, iio);
init_completion(&dht11->completion);
+ mutex_init(&dht11->lock);
iio->name = pdev->name;
iio->dev.parent = &pdev->dev;
iio->info = &dht11_iio_info;
--
1.7.2.5
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