This driver used the wrong OF-helper when looking up the optional
capture-codec child node during probe. Instead of searching just
children of the sound node, a tree-wide depth-first search starting at
the unrelated platform node was done. Not only could this end up
matching an unrelated node or no node at all; the platform node could
also be prematurely freed since of_find_node_by_name() drops a reference
to its first argument. This particular pattern has been observed leading
to crashes after probe deferrals in other drivers.
Fix this by dropping the broken call to of_find_node_by_name() and
keeping only the second, correct lookup using of_get_child_by_name()
while taking care not to bail out if the optional node is missing.
Note that this also addresses two capture-codec node-reference leaks
(one for each of the original helper calls).
Compile tested only.
Fixes: d349caeb0510 ("ASoC: mediatek: Add second I2S on mt8173-rt5650 machine
driver")
Cc: PC Liao <pc.l...@mediatek.com>
Signed-off-by: Johan Hovold <jo...@kernel.org>
---
sound/soc/mediatek/mt8173/mt8173-rt5650.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/sound/soc/mediatek/mt8173/mt8173-rt5650.c
b/sound/soc/mediatek/mt8173/mt8173-rt5650.c
index 40ebefd625c1..679fc8bea0a3 100644
--- a/sound/soc/mediatek/mt8173/mt8173-rt5650.c
+++ b/sound/soc/mediatek/mt8173/mt8173-rt5650.c
@@ -272,15 +272,10 @@ static int mt8173_rt5650_dev_probe(struct platform_device
*pdev)
}
mt8173_rt5650_codecs[1].of_node = mt8173_rt5650_codecs[0].of_node;
- if (of_find_node_by_name(platform_node, "codec-capture")) {
- np = of_get_child_by_name(pdev->dev.of_node, "codec-capture");
- if (!np) {
- dev_err(&pdev->dev,
- "%s: Can't find codec-capture DT node\n",
- __func__);
- return -EINVAL;
- }
+ np = of_get_child_by_name(pdev->dev.of_node, "codec-capture");
+ if (np) {
ret = snd_soc_of_get_dai_name(np, &codec_capture_dai);
+ of_node_put(np);
if (ret < 0) {
dev_err(&pdev->dev,
"%s codec_capture_dai name fail %d\n",
--
2.13.6
