From 0b4b5925bf16c83c40c4a71e78921d60db840dc2 Mon Sep 17 00:00:00 2001 From: Sergiu Cuciurean Date: Thu, 14 May 2020 12:00:42 +0300 Subject: [PATCH] iio: dac: ad5446: Replace indio_dev->mlock with own device lock 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 Signed-off-by: Jonathan Cameron --- drivers/iio/dac/ad5446.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/iio/dac/ad5446.c b/drivers/iio/dac/ad5446.c index 9884e29..8f8afc8 100644 --- a/drivers/iio/dac/ad5446.c +++ b/drivers/iio/dac/ad5446.c @@ -33,6 +33,7 @@ * @chip_info: chip model specific constants, available modes etc * @reg: supply regulator * @vref_mv: actual reference voltage used + * @lock lock to protect the data buffer during write ops */ struct ad5446_state { @@ -43,6 +44,7 @@ struct ad5446_state { unsigned cached_val; unsigned pwr_down_mode; unsigned pwr_down; + struct mutex lock; }; /** @@ -112,7 +114,7 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, if (ret) return ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->pwr_down = powerdown; if (st->pwr_down) { @@ -123,7 +125,7 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, } ret = st->chip_info->write(st, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret ? ret : len; } @@ -197,11 +199,11 @@ static int ad5446_write_raw(struct iio_dev *indio_dev, return -EINVAL; val <<= chan->scan_type.shift; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->cached_val = val; if (!st->pwr_down) ret = st->chip_info->write(st, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); break; default: ret = -EINVAL; @@ -256,6 +258,8 @@ static int ad5446_probe(struct device *dev, const char *name, indio_dev->channels = &st->chip_info->channel; indio_dev->num_channels = 1; + mutex_init(&st->lock); + st->pwr_down_mode = MODE_PWRDWN_1k; if (st->chip_info->int_vref_mv) -- 2.7.4