From 95bd363bbc0bc22d9c14945e307fc30484c57166 Mon Sep 17 00:00:00 2001 From: Alison Schofield Date: Mon, 6 Jun 2016 22:10:23 -0700 Subject: [PATCH] iio: light: tcs3472: use iio helper function to guarantee direct mode Replace the code that guarantees the device stays in direct mode with iio_device_claim_direct_mode() which does same. This allows removal of an unused lock in the device private global data. Also prevents a previous race condition when a buffer is enabled whilst a raw read is going on. Signed-off-by: Alison Schofield Cc: Daniel Baluta Acked-by: Peter Meerwald-Stadler Signed-off-by: Jonathan Cameron --- drivers/iio/light/tcs3472.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c index 1b530bf04c89..b29312f99077 100644 --- a/drivers/iio/light/tcs3472.c +++ b/drivers/iio/light/tcs3472.c @@ -52,7 +52,6 @@ struct tcs3472_data { struct i2c_client *client; - struct mutex lock; u8 enable; u8 control; u8 atime; @@ -117,17 +116,16 @@ 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 = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; ret = tcs3472_req_data(data); if (ret < 0) { - mutex_unlock(&data->lock); + iio_device_release_direct_mode(indio_dev); return ret; } ret = i2c_smbus_read_word_data(data->client, chan->address); - mutex_unlock(&data->lock); + iio_device_release_direct_mode(indio_dev); if (ret < 0) return ret; *val = ret; @@ -263,7 +261,6 @@ 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; -- 2.20.1