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iio: light: vcnl4000: Add missing locking 

Signed-off-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald-Stadler 2016-07-05 12:23:21 +02:00 committed by Jonathan Cameron
parent 5d6931393f
commit ff34ed6d78
1 changed files with 14 additions and 4 deletions
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18
drivers/iio/light/vcnl4000.c
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@ -48,6 +48,7 @@
struct vcnl4000_data {
struct i2c_client *client;
struct mutex lock;
};
static const struct i2c_device_id vcnl4000_id[] = {
@ -63,16 +64,18 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
__be16 buf;
int ret;
mutex_lock(&data->lock);
ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND,
req_mask);
if (ret < 0)
return ret;
goto fail;
/* wait for data to become ready */
while (tries--) {
ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND);
if (ret < 0)
return ret;
goto fail;
if (ret & rdy_mask)
break;
msleep(20); /* measurement takes up to 100 ms */
@ -81,17 +84,23 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
if (tries < 0) {
dev_err(&data->client->dev,
"vcnl4000_measure() failed, data not ready\n");
return -EIO;
ret = -EIO;
goto fail;
}
ret = i2c_smbus_read_i2c_block_data(data->client,
data_reg, sizeof(buf), (u8 *) &buf);
if (ret < 0)
return ret;
goto fail;
mutex_unlock(&data->lock);
*val = be16_to_cpu(buf);
return 0;
fail:
mutex_unlock(&data->lock);
return ret;
}
static const struct iio_chan_spec vcnl4000_channels[] = {
@ -163,6 +172,7 @@ static int vcnl4000_probe(struct i2c_client *client,
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
mutex_init(&data->lock);
ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV);
if (ret < 0)