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

Jonathan Cameron
2016-10-15T14:55:57Z

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@gmail.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!

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,
>