[PATCH 10/13] iio: dac: ad3552: Use __free(fwnode_handle) to replace fwnode_handle_put() calls

Jonathan Cameron
2024-01-14T17:21:28Z

us to exit directly from error conditions within the
device_for_each_child_node(dev, child) loop. On normal exit from that
loop no fwnode_handle reference will be held and the child pointer
will be NULL thus making the automatically run fwnode_handle_put() a
noop.

Removing the goto err; statements also allows more extensive use of
dev_err_probe() further simplifying the code.

Cc: Mihail Chindris <mihail.chindris@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
drivers/iio/dac/ad3552r.c | 50 +++++++++++++++------------------------
1 file changed, 19 insertions(+), 31 deletions(-)

diff --git a/drivers/iio/dac/ad3552r.c b/drivers/iio/dac/ad3552r.c
index a492e8f2fc0f..f21c88cb480a 100644
--- a/drivers/iio/dac/ad3552r.c
+++ b/drivers/iio/dac/ad3552r.c
@@ -880,7 +880,7 @@ static void ad3552r_reg_disable(void *reg)
static int ad3552r_configure_device(struct ad3552r_desc *dac)
{
struct device *dev = &dac->spi->dev;
- struct fwnode_handle *child;
+ struct fwnode_handle *child __free(fwnode_handle) = NULL;
struct regulator *vref;
int err, cnt = 0, voltage, delta = 100000;
u32 vals[2], val, ch;
@@ -951,51 +951,43 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)

device_for_each_child_node(dev, child) {
err = fwnode_property_read_u32(child, "reg", &ch);
- if (err) {
- dev_err(dev, "mandatory reg property missing\n");
- goto put_child;
- }
- if (ch >= AD3552R_NUM_CH) {
- dev_err(dev, "reg must be less than %d\n",
- AD3552R_NUM_CH);
- err = -EINVAL;
- goto put_child;
- }
+ if (err)
+ return dev_err_probe(dev, err,
+ "mandatory reg property missing\n");
+ if (ch >= AD3552R_NUM_CH)
+ return dev_err_probe(dev, -EINVAL,
+ "reg must be less than %d\n",
+ AD3552R_NUM_CH);

if (fwnode_property_present(child, "adi,output-range-microvolt")) {
err = fwnode_property_read_u32_array(child,
"adi,output-range-microvolt",
vals,
2);
- if (err) {
- dev_err(dev,
+ if (err)
+ return dev_err_probe(dev, err,
"adi,output-range-microvolt property could not be parsed\n");
- goto put_child;
- }

err = ad3552r_find_range(dac->chip_id, vals);
- if (err < 0) {
- dev_err(dev,
- "Invalid adi,output-range-microvolt value\n");
- goto put_child;
- }
+ if (err < 0)
+ return dev_err_probe(dev, err,
+ "Invalid adi,output-range-microvolt value\n");
+
val = err;
err = ad3552r_set_ch_value(dac,
AD3552R_CH_OUTPUT_RANGE_SEL,
ch, val);
if (err)
- goto put_child;
+ return err;

dac->ch_data[ch].range = val;
} else if (dac->chip_id == AD3542R_ID) {
- dev_err(dev,
- "adi,output-range-microvolt is required for ad3542r\n");
- err = -EINVAL;
- goto put_child;
+ return dev_err_probe(dev, -EINVAL,
+ "adi,output-range-microvolt is required for ad3542r\n");
} else {
err = ad3552r_configure_custom_gain(dac, child, ch);
if (err)
- goto put_child;
+ return err;
}

ad3552r_calc_gain_and_offset(dac, ch);
@@ -1003,7 +995,7 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)

err = ad3552r_set_ch_value(dac, AD3552R_CH_SELECT, ch, 1);
if (err < 0)
- goto put_child;
+ return err;

dac->channels[cnt] = AD3552R_CH_DAC(ch);
++cnt;
@@ -1021,10 +1013,6 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)
dac->num_ch = cnt;

return 0;
-put_child:
- fwnode_handle_put(child);
-
- return err;
}

static int ad3552r_init(struct ad3552r_desc *dac)
--
2.43.0