[PATCH v2 10/10] iio: adc: ad7606: switch mutexes to scoped_guard
From: Guillaume Stols <hidden>
Date: 2024-06-28 14:48:46
Also in:
linux-devicetree, linux-iio, lkml
Subsystem:
analog devices inc iio drivers, iio subsystem and drivers, the rest · Maintainers:
Nuno Sá, Michael Hennerich, Jonathan Cameron, Linus Torvalds
Switching to scoped_guard simplifies the code and avoids to take care to unlock the mutex in case of premature return. Signed-off-by: Guillaume Stols <redacted> --- drivers/iio/adc/ad7606.c | 60 ++++++++++++++++++++++-------------------------- 1 file changed, 27 insertions(+), 33 deletions(-)
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
index 50ccc245e314..3c439787d130 100644
--- a/drivers/iio/adc/ad7606.c
+++ b/drivers/iio/adc/ad7606.c@@ -69,19 +69,17 @@ static int ad7606_reg_access(struct iio_dev *indio_dev, struct ad7606_state *st = iio_priv(indio_dev); int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); + if (readval) { ret = st->bops->reg_read(st, reg); if (ret < 0) - goto err_unlock; + return ret; *readval = ret; - ret = 0; + return 0; } else { - ret = st->bops->reg_write(st, reg, writeval); + return st->bops->reg_write(st, reg, writeval); } -err_unlock: - mutex_unlock(&st->lock); - return ret; } static int ad7606_read_samples(struct ad7606_state *st)
@@ -124,18 +122,18 @@ static irqreturn_t ad7606_trigger_handler(int irq, void *p) struct ad7606_state *st = iio_priv(indio_dev); int ret; - mutex_lock(&st->lock); + scoped_guard(mutex, &st->lock) { + ret = ad7606_read_samples(st); + if (ret) + goto error_ret; - ret = ad7606_read_samples(st); - if (ret == 0) iio_push_to_buffers_with_timestamp(indio_dev, st->data, iio_get_time_ns(indio_dev)); - - iio_trigger_notify_done(indio_dev->trig); - /* The rising edge of the CONVST signal starts a new conversion. */ - gpiod_set_value(st->gpio_convst, 1); - - mutex_unlock(&st->lock); +error_ret: + iio_trigger_notify_done(indio_dev->trig); + /* The rising edge of the CONVST signal starts a new conversion. */ + gpiod_set_value(st->gpio_convst, 1); + } return IRQ_HANDLED; }
@@ -259,17 +257,15 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_SCALE: - mutex_lock(&st->lock); - i = find_closest(val2, st->scale_avail, st->num_scales); - if (st->sw_mode_en) - ch = chan->address; - ret = st->write_scale(indio_dev, ch, i); - if (ret < 0) { - mutex_unlock(&st->lock); - return ret; + scoped_guard(mutex, &st->lock) { + i = find_closest(val2, st->scale_avail, st->num_scales); + if (st->sw_mode_en) + ch = chan->address; + ret = st->write_scale(indio_dev, ch, i); + if (ret < 0) + return ret; + st->range[ch] = i; } - st->range[ch] = i; - mutex_unlock(&st->lock); return 0; case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
@@ -277,14 +273,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, return -EINVAL; i = find_closest(val, st->oversampling_avail, st->num_os_ratios); - mutex_lock(&st->lock); - ret = st->write_os(indio_dev, i); - if (ret < 0) { - mutex_unlock(&st->lock); - return ret; + scoped_guard(mutex, &st->lock) { + ret = st->write_os(indio_dev, i); + if (ret < 0) + return ret; + st->oversampling = st->oversampling_avail[i]; } - st->oversampling = st->oversampling_avail[i]; - mutex_unlock(&st->lock); return 0; default:
--
2.34.1