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iio: dht11: Add locking

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Make sure that the read function is not interrupted...

Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Harald Geyer <harald@ccbib.org>
Reviewed-by: Sanjeev Sharma <sanjeev_sharma@mentor.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Richard Weinberger 2015-01-07 13:18:23 +01:00 committed by Jonathan Cameron
parent ddc25bdd2b
commit 004bc53034
1 changed files with 5 additions and 0 deletions
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5
drivers/iio/humidity/dht11.c
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@ -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;