iio: ltc2983: Fix of_node refcounting

When returning or breaking early from a
`for_each_available_child_of_node()` loop, we need to explicitly call
`of_node_put()` on the child node to possibly release the node.

Fixes: f110f3188e563 ("iio: temperature: Add support for LTC2983")
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200925091045.302-1-nuno.sa@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
index 55ff28a..3b5ba26 100644 (file)
--- a/drivers/iio/temperature/ltc2983.c
+++ b/drivers/iio/temperature/ltc2983.c
@@ -1285,18 +1285,20 @@ static int ltc2983_parse_dt(struct ltc2983_data *st)
                ret = of_property_read_u32(child, "reg", &sensor.chan);
                if (ret) {
                        dev_err(dev, "reg property must given for child nodes\n");
-                       return ret;
+                       goto put_child;
                }
 
                /* check if we have a valid channel */
                if (sensor.chan < LTC2983_MIN_CHANNELS_NR ||
                    sensor.chan > LTC2983_MAX_CHANNELS_NR) {
+                       ret = -EINVAL;
                        dev_err(dev,
                                "chan:%d must be from 1 to 20\n", sensor.chan);
-                       return -EINVAL;
+                       goto put_child;
                } else if (channel_avail_mask & BIT(sensor.chan)) {
+                       ret = -EINVAL;
                        dev_err(dev, "chan:%d already in use\n", sensor.chan);
-                       return -EINVAL;
+                       goto put_child;
                }
 
                ret = of_property_read_u32(child, "adi,sensor-type",
@@ -1304,7 +1306,7 @@ static int ltc2983_parse_dt(struct ltc2983_data *st)
                if (ret) {
                        dev_err(dev,
                                "adi,sensor-type property must given for child nodes\n");
-                       return ret;
+                       goto put_child;
                }
 
                dev_dbg(dev, "Create new sensor, type %u, chann %u",
@@ -1334,13 +1336,15 @@ static int ltc2983_parse_dt(struct ltc2983_data *st)
                        st->sensors[chan] = ltc2983_adc_new(child, st, &sensor);
                } else {
                        dev_err(dev, "Unknown sensor type %d\n", sensor.type);
-                       return -EINVAL;
+                       ret = -EINVAL;
+                       goto put_child;
                }
 
                if (IS_ERR(st->sensors[chan])) {
                        dev_err(dev, "Failed to create sensor %ld",
                                PTR_ERR(st->sensors[chan]));
-                       return PTR_ERR(st->sensors[chan]);
+                       ret = PTR_ERR(st->sensors[chan]);
+                       goto put_child;
                }
                /* set generic sensor parameters */
                st->sensors[chan]->chan = sensor.chan;
@@ -1351,6 +1355,9 @@ static int ltc2983_parse_dt(struct ltc2983_data *st)
        }
 
        return 0;
+put_child:
+       of_node_put(child);
+       return ret;
 }
 
 static int ltc2983_setup(struct ltc2983_data *st, bool assign_iio)