linux-kernel - Re: [RFC PATCH v2 2/2] staging: iio: ad7192: use iio_device_{claim|release}_direct

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Date:	Sat, 12 Mar 2016 11:25:29 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Alison Schofield <amsfield22@...il.com>,
	outreachy-kernel@...glegroups.com
Cc:	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michael.Hennerich@...log.com, gregkh@...uxfoundation.org,
	devel@...verdev.osuosl.org
Subject: Re: [RFC PATCH v2 2/2] staging: iio: ad7192: use
 iio_device_{claim|release}_direct_mode()

On 12/03/16 11:21, Jonathan Cameron wrote:
> On 09/03/16 19:30, Alison Schofield wrote:
>> Replace the code that guarantees the device stays in direct mode with
>> iio_device_{claim|release}_direct_mode() which does same.
>>
>> Signed-off-by: Alison Schofield <amsfield22@...il.com>
> A small improvement inline - don't eat the errors within the
> driver. 
As it is trivial - I've fixed it up as suggested and applied.
Seemed silly to go round again for such a small change.

I'm hoping you have the opportunity to take this tree wide.

Thanks,

Jonathan
> 
> Jonathan
>> ---
>>  drivers/staging/iio/adc/ad7192.c | 24 +++++++++---------------
>>  1 file changed, 9 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
>> index f843f19..94a2e06 100644
>> --- a/drivers/staging/iio/adc/ad7192.c
>> +++ b/drivers/staging/iio/adc/ad7192.c
>> @@ -349,11 +349,9 @@ static ssize_t ad7192_write_frequency(struct device *dev,
>>  	if (lval == 0)
>>  		return -EINVAL;
>>  
>> -	mutex_lock(&indio_dev->mlock);
>> -	if (iio_buffer_enabled(indio_dev)) {
>> -		mutex_unlock(&indio_dev->mlock);
>> +	ret = iio_device_claim_direct_mode(indio_dev);
>> +	if (ret)
>>  		return -EBUSY;
> return ret;  In theory we might be returning some other
> error code so best not to 'eat' the result.
>> -	}
>>  
>>  	div = st->mclk / (lval * st->f_order * 1024);
>>  	if (div < 1 || div > 1023) {
>> @@ -366,7 +364,7 @@ static ssize_t ad7192_write_frequency(struct device *dev,
>>  	ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
>>  
>>  out:
>> -	mutex_unlock(&indio_dev->mlock);
>> +	iio_device_release_direct_mode(indio_dev);
>>  
>>  	return ret ? ret : len;
>>  }
>> @@ -434,11 +432,9 @@ static ssize_t ad7192_set(struct device *dev,
>>  	if (ret < 0)
>>  		return ret;
>>  
>> -	mutex_lock(&indio_dev->mlock);
>> -	if (iio_buffer_enabled(indio_dev)) {
>> -		mutex_unlock(&indio_dev->mlock);
>> +	ret = iio_device_claim_direct_mode(indio_dev);
>> +	if (ret)
>>  		return -EBUSY;
> Same here.
>> -	}
>>  
>>  	switch ((u32)this_attr->address) {
>>  	case AD7192_REG_GPOCON:
>> @@ -461,7 +457,7 @@ static ssize_t ad7192_set(struct device *dev,
>>  		ret = -EINVAL;
>>  	}
>>  
>> -	mutex_unlock(&indio_dev->mlock);
>> +	iio_device_release_direct_mode(indio_dev);
>>  
>>  	return ret ? ret : len;
>>  }
>> @@ -555,11 +551,9 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
>>  	int ret, i;
>>  	unsigned int tmp;
>>  
>> -	mutex_lock(&indio_dev->mlock);
>> -	if (iio_buffer_enabled(indio_dev)) {
>> -		mutex_unlock(&indio_dev->mlock);
>> +	ret = iio_device_claim_direct_mode(indio_dev);
>> +	if (ret)
>>  		return -EBUSY;
> And here.
>> -	}
>>  
>>  	switch (mask) {
>>  	case IIO_CHAN_INFO_SCALE:
>> @@ -582,7 +576,7 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
>>  		ret = -EINVAL;
>>  	}
>>  
>> -	mutex_unlock(&indio_dev->mlock);
>> +	iio_device_release_direct_mode(indio_dev);
>>  
>>  	return ret;
>>  }
>>
> 
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