[PATCH 2/3] ASoC: cs-amp-lib: Fix missing dput() after debugfs_lookup()

[Richard Fitzgerald <rf@opensource.cirrus.com>]

Rewrite cs_amp_create_debugfs() so that dput() will be called on
a valid dentry returned from debugfs_lookup().

The pointer returned from debugfs_lookup() must be released by dput().
The pointer returned from debugfs_create_dir() does not need to be
passed to dput().

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: cdd27fa3298a ("ASoC: cs-amp-lib: Add helpers for factory calibration")
---
 sound/soc/codecs/cs-amp-lib.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/cs-amp-lib.c b/sound/soc/codecs/cs-amp-lib.c
index 881c6f2264f3..e97a125ebbb3 100644
--- a/sound/soc/codecs/cs-amp-lib.c
+++ b/sound/soc/codecs/cs-amp-lib.c
@@ -833,11 +833,18 @@ EXPORT_SYMBOL_NS_GPL(cs_amp_devm_get_vendor_specific_variant_id, "SND_SOC_CS_AMP
  */
 struct dentry *cs_amp_create_debugfs(struct device *dev)
 {
-	struct dentry *dir;
+	struct dentry *dir, *created;
 
+	/* debugfs_lookup() can return NULL or ERR_PTR on error */
 	dir = debugfs_lookup("cirrus_logic", NULL);
-	if (!dir)
-		dir = debugfs_create_dir("cirrus_logic", NULL);
+	if (!IS_ERR_OR_NULL(dir)) {
+		created = debugfs_create_dir(dev_name(dev), dir);
+		dput(dir);
+
+		return created;
+	}
+
+	dir = debugfs_create_dir("cirrus_logic", NULL);
 
 	return debugfs_create_dir(dev_name(dev), dir);
 }
-- 
2.47.3