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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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