From b67869791084662e7428e4598129651c29c93667 Mon Sep 17 00:00:00 2001 From: Alison Schofield Date: Mon, 6 Jun 2016 22:09:21 -0700 Subject: [PATCH] iio: light: tcs3414: 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 possible race around a buffer being enabled whilst a 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/tcs3414.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/iio/light/tcs3414.c b/drivers/iio/light/tcs3414.c index f90f8c5919fe..8a15fb541dc3 100644 --- a/drivers/iio/light/tcs3414.c +++ b/drivers/iio/light/tcs3414.c @@ -53,7 +53,6 @@ struct tcs3414_data { struct i2c_client *client; - struct mutex lock; u8 control; u8 gain; u8 timing; @@ -134,16 +133,16 @@ static int tcs3414_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 = tcs3414_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; @@ -288,7 +287,6 @@ static int tcs3414_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 = &tcs3414_info; -- 2.20.1