[PATCH v2] ASoC: cpcap: use the platform OF node setter

[Yige Jiang <yigejiang86@gmail.com>]

cpcap_codec_probe() gets the audio-codec child node and assigns it
only to dev.of_node. Platform device release now puts dev.fwnode,
so the acquired node reference is never returned.

Use platform_device_set_of_node() to synchronize both fields and
give the device its own reference. Use __free(device_node) to release
the local lookup reference when probe returns. The device keeps the
node until it is replaced or the platform device is released; a probe
retry also drops the old device-owned reference.

Fixes: 7b5b51b2b05c ("driver core: platform: count references to all kinds of firmware nodes")
Signed-off-by: Yige Jiang <yigejiang86@gmail.com>
---
Changes in v2:
- Use __free(device_node) for the local lookup reference instead of
  an explicit of_node_put(), as suggested by Bartosz Golaszewski.
- Remove the Assisted-by trailer and keep a plain-text AI disclosure.

v1: https://lore.kernel.org/r/rc-review-20261103-28-afc55c614a25@gmail.com

Based on linux-next next-20261102 (2637bdec0535).
Compile-tested: arm64, GCC 14.2.0, W=1, CONFIG_OF_DYNAMIC=y.
COMPILE_TEST=y.
Baseline and v2 target objects built from this exact base.
No full kernel/module-link, hardware or runtime test was performed.
AI assistance was used for analysis and patch preparation.

 sound/soc/codecs/cpcap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/cpcap.c b/sound/soc/codecs/cpcap.c
index eaaf141dea57e3d14078c47350c1c4daaa0662b6..0e7c05f5bab607f8c4fb17d493e578b831a32f84 100644
--- a/sound/soc/codecs/cpcap.c
+++ b/sound/soc/codecs/cpcap.c
@@ -1754,14 +1754,14 @@ static const struct snd_soc_component_driver soc_codec_dev_cpcap = {
 
 static int cpcap_codec_probe(struct platform_device *pdev)
 {
-	struct device_node *codec_node =
+	struct device_node *codec_node __free(device_node) =
 		of_get_child_by_name(pdev->dev.parent->of_node, "audio-codec");
 	struct cpcap_audio *cpcap;
 
 	if (!codec_node)
 		return -ENODEV;
 
-	pdev->dev.of_node = codec_node;
+	platform_device_set_of_node(pdev, codec_node);
 
 	cpcap = devm_kzalloc(&pdev->dev, sizeof(*cpcap), GFP_KERNEL);
 	if (!cpcap)

base-commit: 2637bdec0535a2044cd830eba9a79363651d9043