On 20/03/17 19:51, Arushi Singhal 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: Arushi Singhal <arushisinghal19971997@xxxxxxxxx>
Nice patch.
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.
Thanks,
Jonathan
> ---
> changes in v3
> - Add mutex_init.
> - correct the Documentation.
>
> drivers/staging/iio/adc/ad7606.c | 9 +++++----
> drivers/staging/iio/adc/ad7606.h | 3 +++
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
> index 9dbfa64b1e53..18f5f139117e 100644
> --- a/drivers/staging/iio/adc/ad7606.c
> +++ b/drivers/staging/iio/adc/ad7606.c
> @@ -208,7 +208,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> switch (mask) {
> case IIO_CHAN_INFO_SCALE:
> ret = -EINVAL;
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->lock);
> for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
> if (val2 == scale_avail[i][1]) {
> gpiod_set_value(st->gpio_range, i);
> @@ -217,7 +217,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> ret = 0;
> break;
> }
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->lock);
>
> return ret;
> case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> @@ -231,11 +231,11 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> values[1] = (ret >> 1) & 1;
> values[2] = (ret >> 2) & 1;
>
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->lock);
> gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
> values);
> st->oversampling = val;
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->lock);
>
> return 0;
> default:
> @@ -413,6 +413,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
> st = iio_priv(indio_dev);
>
> st->dev = dev;
> + mutex_init(&st->lock);
> st->bops = bops;
> st->base_address = base_address;
> /* tied to logic low, analog input range is +/- 5V */
> diff --git a/drivers/staging/iio/adc/ad7606.h b/drivers/staging/iio/adc/ad7606.h
> index 746f9553d2ba..acaed8d5379c 100644
> --- a/drivers/staging/iio/adc/ad7606.h
> +++ b/drivers/staging/iio/adc/ad7606.h
> @@ -14,6 +14,7 @@
> * @name: identification string for chip
> * @channels: channel specification
> * @num_channels: number of channels
> + * @lock protect sensor state
> */
>
> struct ad7606_chip_info {
> @@ -23,6 +24,7 @@ struct ad7606_chip_info {
>
> /**
> * struct ad7606_state - driver instance specific data
> + * @lock protect sensor state
> */
>
> struct ad7606_state {
> @@ -37,6 +39,7 @@ struct ad7606_state {
> bool done;
> void __iomem *base_address;
>
> + struct mutex lock; /* protect sensor state */
> struct gpio_desc *gpio_convst;
> struct gpio_desc *gpio_reset;
> struct gpio_desc *gpio_range;
>
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