linux-kernel - Re: [PATCH] iio: accel: mma8452: claim direct mode during write raw

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Date:   Sat, 15 Oct 2016 16:05:24 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alison Schofield <amsfield22@...il.com>
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: accel: mma8452: claim direct mode during write raw

On 15/10/16 15:55, Jonathan Cameron wrote:
> On 11/10/16 20:32, Alison Schofield wrote:
>> Driver was checking for direct mode but not locking it.  Use
>> claim/release helper functions to guarantee the device stays
>> in direct mode during all write raw operations.
>>
>> Signed-off-by: Alison Schofield <amsfield22@...il.com>
> Well you were consistent.  Forgot breaks that needed adding everywhere ;)
> 
> I fixed up and applied to the togreg branch of iio.git - initially
> pushed out as testing for the autobuilders to play with it.
> 
> Please sanity check I didn't mess it up!
Just noticed, that break would work better than goto here as well
so have made that change and pushed out.

Let me know if i messed it up.

Jonathan
> 
> Thanks,
> 
> Jonathan
>> ---
>>  drivers/iio/accel/mma8452.c | 53 +++++++++++++++++++++++++++------------------
>>  1 file changed, 32 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
>> index 7951def..cbbc746 100644
>> --- a/drivers/iio/accel/mma8452.c
>> +++ b/drivers/iio/accel/mma8452.c
>> @@ -666,37 +666,43 @@ static int mma8452_write_raw(struct iio_dev *indio_dev,
>>  	struct mma8452_data *data = iio_priv(indio_dev);
>>  	int i, ret;
>>  
>> -	if (iio_buffer_enabled(indio_dev))
>> -		return -EBUSY;
>> +	ret = iio_device_claim_direct_mode(indio_dev);
>> +	if (ret)
>> +		return ret;
>>  
>>  	switch (mask) {
>>  	case IIO_CHAN_INFO_SAMP_FREQ:
>>  		i = mma8452_get_samp_freq_index(data, val, val2);
>> -		if (i < 0)
>> -			return i;
>> -
>> +		if (i < 0) {
>> +			ret = i;
>> +			goto release;
>> +		}
>>  		data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
>>  		data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;
>>  
>> -		return mma8452_change_config(data, MMA8452_CTRL_REG1,
>> -					     data->ctrl_reg1);
>> +		ret = mma8452_change_config(data, MMA8452_CTRL_REG1,
>> +					    data->ctrl_reg1);
> break?
>>  	case IIO_CHAN_INFO_SCALE:
>>  		i = mma8452_get_scale_index(data, val, val2);
>> -		if (i < 0)
>> -			return i;
>> +		if (i < 0) {
>> +			ret = i;
>> +			goto release;
>> +		}
>>  
>>  		data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK;
>>  		data->data_cfg |= i;
>>  
>> -		return mma8452_change_config(data, MMA8452_DATA_CFG,
>> -					     data->data_cfg);
>> +		ret = mma8452_change_config(data, MMA8452_DATA_CFG,
>> +					    data->data_cfg);
> break?
>>  	case IIO_CHAN_INFO_CALIBBIAS:
>> -		if (val < -128 || val > 127)
>> -			return -EINVAL;
>> +		if (val < -128 || val > 127) {
>> +			ret = -EINVAL;
>> +			goto release;
>> +		}
>>  
>> -		return mma8452_change_config(data,
>> -					     MMA8452_OFF_X + chan->scan_index,
>> -					     val);
>> +		ret = mma8452_change_config(data,
>> +					    MMA8452_OFF_X + chan->scan_index,
>> +					    val);
> break?
>>  
>>  	case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
>>  		if (val == 0 && val2 == 0) {
>> @@ -705,23 +711,28 @@ static int mma8452_write_raw(struct iio_dev *indio_dev,
>>  			data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK;
>>  			ret = mma8452_set_hp_filter_frequency(data, val, val2);
>>  			if (ret < 0)
>> -				return ret;
>> +				goto release;
>>  		}
>>  
>> -		return mma8452_change_config(data, MMA8452_DATA_CFG,
>> +		ret = mma8452_change_config(data, MMA8452_DATA_CFG,
>>  					     data->data_cfg);
>>  
> break?
>>  	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
>>  		ret = mma8452_get_odr_index(data);
>>  
>>  		for (i = 0; i < ARRAY_SIZE(mma8452_os_ratio); i++) {
>> -			if (mma8452_os_ratio[i][ret] == val)
>> -				return mma8452_set_power_mode(data, i);
>> +			if (mma8452_os_ratio[i][ret] == val) {
>> +				ret = mma8452_set_power_mode(data, i);
>> +				goto release;
>> +			}
>>  		}
>>  
>>  	default:
>> -		return -EINVAL;
>> +		ret = -EINVAL;
>>  	}
>> +release:
>> +	iio_device_release_direct_mode(indio_dev);
>> +	return ret;
>>  }
>>  
>>  static int mma8452_read_thresh(struct iio_dev *indio_dev,
>>
> 
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