commit 004bc530341a40536494431cf665504f8ee70266
author Richard Weinberger <richard@nod.at> Wed Jan 07 13:18:23 2015 +0100
committer Jonathan Cameron <jic23@kernel.org> Sat Jan 10 11:14:53 2015 +0000
tree 86dd7876e723b9d58772b893bd09294833c2e938
parent ddc25bdd2b7f34667111714fafc9c04f6ad97fee

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>

drivers/iio/humidity/dht11.c

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 @@
 	int				irq;
 
 	struct completion		completion;
+	struct mutex			lock;
 
 	s64				timestamp;
 	int				temperature;
@@ -145,6 +147,7 @@
 	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 @@
 		ret = -EINVAL;
 err:
 	dht11->num_edges = -1;
+	mutex_unlock(&dht11->lock);
 	return ret;
 }
 
@@ -268,6 +272,7 @@
 	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;