diff options
| author | Richard Weinberger <richard@nod.at> | 2015-01-07 15:18:23 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-01-10 14:14:53 +0300 |
| commit | 004bc530341a40536494431cf665504f8ee70266 (patch) | |
| tree | 86dd7876e723b9d58772b893bd09294833c2e938 /drivers/iio/humidity/dht11.c | |
| parent | ddc25bdd2b7f34667111714fafc9c04f6ad97fee (diff) | |
| download | linux-004bc530341a40536494431cf665504f8ee70266.tar.xz | |
iio: dht11: Add locking
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>
Diffstat (limited to 'drivers/iio/humidity/dht11.c')
| -rw-r--r-- | 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 f546ecae90f1..7717f5c3395b 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; |