[PATCH AUTOSEL 5.7 194/388] ASoC: ux500: mop500: Fix some refcounted resources issues

Sasha Levin
2020-06-18T01:13:26Z

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit 4e8748fcaeec073e3ba794871ce86c545e4f961f ]

There are 2 issues here:
- if one of the 'of_parse_phandle' fails, calling 'mop500_of_node_put()'
is a no-op because the 'mop500_dai_links' structure has not been
initialized yet, so the referenced are not decremented
- The reference stored in 'mop500_dai_links[i].codecs' is refcounted
only once in the probe and must be decremented only once.

Fixes: 39013bd60e79 ("ASoC: Ux500: Dispose of device nodes correctly")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/20200512100705.246349-1-christophe.jaillet@wanadoo.fr
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/ux500/mop500.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/sound/soc/ux500/mop500.c b/sound/soc/ux500/mop500.c
index 2873e8e6f02b..cdae1190b930 100644
--- a/sound/soc/ux500/mop500.c
+++ b/sound/soc/ux500/mop500.c
@@ -63,10 +63,11 @@ static void mop500_of_node_put(void)
{
int i;

- for (i = 0; i < 2; i++) {
+ for (i = 0; i < 2; i++)
of_node_put(mop500_dai_links[i].cpus->of_node);
- of_node_put(mop500_dai_links[i].codecs->of_node);
- }
+
+ /* Both links use the same codec, which is refcounted only once */
+ of_node_put(mop500_dai_links[0].codecs->of_node);
}

static int mop500_of_probe(struct platform_device *pdev,
@@ -81,7 +82,9 @@ static int mop500_of_probe(struct platform_device *pdev,

if (!(msp_np[0] && msp_np[1] && codec_np)) {
dev_err(&pdev->dev, "Phandle missing or invalid\n");
- mop500_of_node_put();
+ for (i = 0; i < 2; i++)
+ of_node_put(msp_np[i]);
+ of_node_put(codec_np);
return -EINVAL;
}

--
2.25.1