linux-kernel - [PATCH 39/94] iio:tcs3472: Check for buffer enabled and locking

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Message-Id: <1405443709-15288-39-git-send-email-asadi.samuel@gmail.com>
Date:	Tue, 15 Jul 2014 20:00:54 +0300
From:	Sam Asadi <asadi.samuel@...il.com>
To:	gregkh@...uxfoundation.org
Cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	Peter Meerwald <p.meerwald@...-electronic.com>,
	Peter Meerwald <pmeerw@...erw.net>,
	Jonathan Cameron <jic23@...nel.org>,
	sam-the-6 <asadi.samuel@...il.com>
Subject: [PATCH 39/94] iio:tcs3472: Check for buffer enabled and locking

From: Peter Meerwald <p.meerwald@...-electronic.com>

Signed-off-by: Peter Meerwald <pmeerw@...erw.net>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: sam-the-6 <asadi.samuel@...il.com>
---
 drivers/iio/light/tcs3472.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c
index fe063a0..7525699 100644
--- a/drivers/iio/light/tcs3472.c
+++ b/drivers/iio/light/tcs3472.c
@@ -52,6 +52,7 @@
 
 struct tcs3472_data {
 	struct i2c_client *client;
+	struct mutex lock;
 	u8 enable;
 	u8 control;
 	u8 atime;
@@ -116,10 +117,17 @@ static int tcs3472_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
+		if (iio_buffer_enabled(indio_dev))
+			return -EBUSY;
+
+		mutex_lock(&data->lock);
 		ret = tcs3472_req_data(data);
-		if (ret < 0)
+		if (ret < 0) {
+			mutex_unlock(&data->lock);
 			return ret;
+		}
 		ret = i2c_smbus_read_word_data(data->client, chan->address);
+		mutex_unlock(&data->lock);
 		if (ret < 0)
 			return ret;
 		*val = ret;
@@ -255,6 +263,7 @@ static int tcs3472_probe(struct i2c_client *client,
 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;
+	mutex_init(&data->lock);
 
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->info = &tcs3472_info;
-- 
1.7.10.4

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