linux-kernel - Re: [PATCH] iio: light: tcs3414: use iio helper function to guarantee direct mode

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Date:	Sat, 11 Jun 2016 16:56:36 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	Alison Schofield <amsfield22@...il.com>
Cc:	knaack.h@....de, lars@...afoo.de, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: light: tcs3414: use iio helper function to guarantee
 direct mode

On 07/06/16 06:23, Peter Meerwald-Stadler 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>
Applied, thanks.

Joanthan
>  
>> Signed-off-by: Alison Schofield <amsfield22@...il.com>
>> Cc: Daniel Baluta <daniel.baluta@...il.com>
>> ---
>>  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 f90f8c5..8a15fb5 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;
>>
>