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authorJohan Hovold <johan@kernel.org>2018-01-31 16:59:21 +1100
committerMark Brown <broonie@kernel.org>2018-02-07 11:16:39 +0000
commit3a0a7b261009a9eaebd84140e933ee579df18d0c (patch)
tree76800ddda68a2603b466322066bdf8ea19ab6e2d /sound/soc
parent4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323 (diff)
ASoC: mt8173-rt5650: fix child-node lookup
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") Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/mediatek/mt8173/mt8173-rt5650.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/sound/soc/mediatek/mt8173/mt8173-rt5650.c b/sound/soc/mediatek/mt8173/mt8173-rt5650.c
index e69c141d8ed4..45fc2d2640ae 100644
--- a/sound/soc/mediatek/mt8173/mt8173-rt5650.c
+++ b/sound/soc/mediatek/mt8173/mt8173-rt5650.c
@@ -274,15 +274,10 @@ 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",

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