1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c
index fe063a0a21cd..752569985d1d 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;