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]> --- 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"; -- 2.17.1
