On Thu, 14 May 2020 12:12:12 +0300 Sergiu Cuciurean <[email protected]> wrote:
> As part of the general cleanup of indio_dev->mlock, this change replaces > it with a local lock on the device's state structure. > > Signed-off-by: Sergiu Cuciurean <[email protected]> Applied to the togreg branch of iio.git and pushed out as testing. Thanks, Jonathan > --- > drivers/iio/dac/ad5764.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/drivers/iio/dac/ad5764.c b/drivers/iio/dac/ad5764.c > index f7ab211604a1..5b0f0fe354f6 100644 > --- a/drivers/iio/dac/ad5764.c > +++ b/drivers/iio/dac/ad5764.c > @@ -46,6 +46,7 @@ struct ad5764_chip_info { > * @spi: spi_device > * @chip_info: chip info > * @vref_reg: vref supply regulators > + * @lock lock to protect the data buffer during SPI ops > * @data: spi transfer buffers > */ > > @@ -53,6 +54,7 @@ struct ad5764_state { > struct spi_device *spi; > const struct ad5764_chip_info *chip_info; > struct regulator_bulk_data vref_reg[2]; > + struct mutex lock; > > /* > * DMA (thus cache coherency maintenance) requires the > @@ -126,11 +128,11 @@ static int ad5764_write(struct iio_dev *indio_dev, > unsigned int reg, > struct ad5764_state *st = iio_priv(indio_dev); > int ret; > > - mutex_lock(&indio_dev->mlock); > + mutex_lock(&st->lock); > st->data[0].d32 = cpu_to_be32((reg << 16) | val); > > ret = spi_write(st->spi, &st->data[0].d8[1], 3); > - mutex_unlock(&indio_dev->mlock); > + mutex_unlock(&st->lock); > > return ret; > } > @@ -151,7 +153,7 @@ static int ad5764_read(struct iio_dev *indio_dev, > unsigned int reg, > }, > }; > > - mutex_lock(&indio_dev->mlock); > + mutex_lock(&st->lock); > > st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16)); > > @@ -159,7 +161,7 @@ static int ad5764_read(struct iio_dev *indio_dev, > unsigned int reg, > if (ret >= 0) > *val = be32_to_cpu(st->data[1].d32) & 0xffff; > > - mutex_unlock(&indio_dev->mlock); > + mutex_unlock(&st->lock); > > return ret; > } > @@ -295,6 +297,8 @@ static int ad5764_probe(struct spi_device *spi) > indio_dev->num_channels = AD5764_NUM_CHANNELS; > indio_dev->channels = st->chip_info->channels; > > + mutex_init(&st->lock); > + > if (st->chip_info->int_vref == 0) { > st->vref_reg[0].supply = "vrefAB"; > st->vref_reg[1].supply = "vrefCD";
