On 15/03/17 13:28, Gargi Sharma wrote:
> The IIO subsystem is redefining iio_dev->mlock to be used by
> the IIO core only for protecting device operating mode changes.
> ie. Changes between INDIO_DIRECT_MODE, INDIO_BUFFER_* modes.
>
> In this driver, mlock was being used to protect hardware state
> changes. Replace it with a lock in the devices global data.
>
> Signed-off-by: Gargi Sharma <gs051095@xxxxxxxxx>
Was missing from Alison's original patch (since fixed), but
we need to call mutex_init on the mutex somewhere suitable in probe.
Thanks,
Jonathan
> ---
> Changes in v2:
> - Made the commit log clearer.
> ---
> drivers/staging/iio/adc/ad7280a.c | 21 +++++++++++----------
> 1 file changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
> index ee679ac..b482606 100644
> --- a/drivers/staging/iio/adc/ad7280a.c
> +++ b/drivers/staging/iio/adc/ad7280a.c
> @@ -134,6 +134,7 @@ struct ad7280_state {
> unsigned char aux_threshhigh;
> unsigned char aux_threshlow;
> unsigned char cb_mask[AD7280A_MAX_CHAIN];
> + struct mutex lock; /* protect sensor state */
>
> __be32 buf[2] ____cacheline_aligned;
> };
> @@ -410,7 +411,7 @@ static ssize_t ad7280_store_balance_sw(struct device *dev,
> devaddr = this_attr->address >> 8;
> ch = this_attr->address & 0xFF;
>
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->lock);
> if (readin)
> st->cb_mask[devaddr] |= 1 << (ch + 2);
> else
> @@ -418,7 +419,7 @@ static ssize_t ad7280_store_balance_sw(struct device *dev,
>
> ret = ad7280_write(st, devaddr, AD7280A_CELL_BALANCE,
> 0, st->cb_mask[devaddr]);
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->lock);
>
> return ret ? ret : len;
> }
> @@ -433,10 +434,10 @@ static ssize_t ad7280_show_balance_timer(struct device *dev,
> int ret;
> unsigned int msecs;
>
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->lock);
> ret = ad7280_read(st, this_attr->address >> 8,
> this_attr->address & 0xFF);
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->lock);
>
> if (ret < 0)
> return ret;
> @@ -466,11 +467,11 @@ static ssize_t ad7280_store_balance_timer(struct device *dev,
> if (val > 31)
> return -EINVAL;
>
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->lock);
> ret = ad7280_write(st, this_attr->address >> 8,
> this_attr->address & 0xFF,
> 0, (val & 0x1F) << 3);
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->lock);
>
> return ret ? ret : len;
> }
> @@ -655,7 +656,7 @@ static ssize_t ad7280_write_channel_config(struct device *dev,
>
> val = clamp(val, 0L, 0xFFL);
>
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->lock);
> switch ((u32)this_attr->address) {
> case AD7280A_CELL_OVERVOLTAGE:
> st->cell_threshhigh = val;
> @@ -674,7 +675,7 @@ static ssize_t ad7280_write_channel_config(struct device *dev,
> ret = ad7280_write(st, AD7280A_DEVADDR_MASTER,
> this_attr->address, 1, val);
>
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->lock);
>
> return ret ? ret : len;
> }
> @@ -792,13 +793,13 @@ static int ad7280_read_raw(struct iio_dev *indio_dev,
>
> switch (m) {
> case IIO_CHAN_INFO_RAW:
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->lock);
> if (chan->address == AD7280A_ALL_CELLS)
> ret = ad7280_read_all_channels(st, st->scan_cnt, NULL);
> else
> ret = ad7280_read_channel(st, chan->address >> 8,
> chan->address & 0xFF);
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->lock);
>
> if (ret < 0)
> return ret;
>
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