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Date:   Fri, 23 Sep 2022 19:47:36 -0400
From:   Sasha Levin <>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Sasha Levin <>, Marcin Wojtas <>,
        Russell King <>,
        "David S. Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Greg Kroah-Hartman <>,,
Subject: [PATCH] Revert "net: mvpp2: debugfs: fix memory leak when using debugfs_lookup()"

This reverts commit fe2c9c61f668cde28dac2b188028c5299cedcc1e.

On Tue, Sep 13, 2022 at 05:48:58PM +0100, Russell King (Oracle) wrote:
>What happens if this is built as a module, and the module is loaded,
>binds (and creates the directory), then is removed, and then re-
>inserted?  Nothing removes the old directory, so doesn't
>debugfs_create_dir() fail, resulting in subsequent failure to add
>any subsequent debugfs entries?
>I don't think this patch should be backported to stable trees until
>this point is addressed.

Revert until a proper fix is available as the original behavior was

Cc: Marcin Wojtas <>
Cc: Russell King <>
Cc: "David S. Miller" <>
Cc: Eric Dumazet <>
Cc: Jakub Kicinski <>
Cc: Paolo Abeni <>
Cc: Greg Kroah-Hartman <>
Reported-by: Russell King <>
Fixes: fe2c9c61f668 ("net: mvpp2: debugfs: fix memory leak when using debugfs_lookup()")
Signed-off-by: Sasha Levin <>
 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
index 0eec05d905eb..4a3baa7e0142 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
@@ -700,10 +700,10 @@ void mvpp2_dbgfs_cleanup(struct mvpp2 *priv)
 void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name)
-	static struct dentry *mvpp2_root;
-	struct dentry *mvpp2_dir;
+	struct dentry *mvpp2_dir, *mvpp2_root;
 	int ret, i;
+	mvpp2_root = debugfs_lookup(MVPP2_DRIVER_NAME, NULL);
 	if (!mvpp2_root)
 		mvpp2_root = debugfs_create_dir(MVPP2_DRIVER_NAME, NULL);

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