linux-kernel - Re: [PATCH] iio: light: tcs3472: use iio helper function to guarantee direct mode

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Date:	Tue, 7 Jun 2016 07:23:32 +0200 (CEST)
From:	Peter Meerwald-Stadler <pmeerw@...erw.net>
To:	Alison Schofield <amsfield22@...il.com>
cc:	jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: light: tcs3472: use iio helper function to guarantee
 direct mode

On Mon, 6 Jun 2016, Alison Schofield wrote:

> 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.

Acked-by: Peter Meerwald-Stadler <pmeerw@...erw.net>
 
> Signed-off-by: Alison Schofield <amsfield22@...il.com>
> Cc: Daniel Baluta <daniel.baluta@...il.com>
> ---
>  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 1b530bf..b29312f 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;
> 

-- 

Peter Meerwald-Stadler
+43-664-2444418 (mobile)