On 20/03/17 16:09, 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>
> ---
> drivers/staging/iio/meter/ade7759.c | 4 ++--
> drivers/staging/iio/meter/ade7759.h | 1 +
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/iio/meter/ade7759.c b/drivers/staging/iio/meter/ade7759.c
> index 944ee3401029..1d1e0b33021f 100644
> --- a/drivers/staging/iio/meter/ade7759.c
> +++ b/drivers/staging/iio/meter/ade7759.c
> @@ -381,7 +381,7 @@ static ssize_t ade7759_write_frequency(struct device *dev,
> if (!val)
> return -EINVAL;
>
> - mutex_lock(&indio_dev->mlock);
> + mutex_lock(&st->buf_lock);
>
> t = 27900 / val;
> if (t > 0)
> @@ -402,7 +402,7 @@ static ssize_t ade7759_write_frequency(struct device *dev,
Deadlock as this call also take the buf_lock mutex..
> ret = ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
>
> out:
> - mutex_unlock(&indio_dev->mlock);
> + mutex_unlock(&st->buf_lock);
>
> return ret ? ret : len;
> }
> diff --git a/drivers/staging/iio/meter/ade7759.h b/drivers/staging/iio/meter/ade7759.h
> index f0716d2fdf8e..4f69bb93cc45 100644
> --- a/drivers/staging/iio/meter/ade7759.h
> +++ b/drivers/staging/iio/meter/ade7759.h
> @@ -42,6 +42,7 @@
> * @buf_lock: mutex to protect tx and rx
> * @tx: transmit buffer
> * @rx: receive buffer
> + * @lock protect sensor state
?
> **/
> struct ade7759_state {
> struct spi_device *us;
>
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