linux-kernel - [PATCH] regulator: Avoid a double 'of_node_get' in 'regulator_of_get_init

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Message-Id: <a79f0068812b89ff412d572a1171f22109c24132.1618947049.git.christophe.jaillet@wanadoo.fr>
Date:   Tue, 20 Apr 2021 21:31:51 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     lgirdwood@...il.com, broonie@...nel.org,
        ckeepax@...nsource.cirrus.com
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] regulator: Avoid a double 'of_node_get' in 'regulator_of_get_init_node()'

'for_each_available_child_of_node()' already performs an 'of_node_get()'
on child, so there is no need to perform another one before returning.
Otherwise, a double 'get' is performed and a resource may never be
released.

Fixes: 925c85e21ed8 ("regulator: Factor out location of init data OF node")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Untested, speculative patch
---
 drivers/regulator/of_regulator.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 564f928eb1db..49f6c05fee34 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -422,7 +422,11 @@ device_node *regulator_of_get_init_node(struct device *dev,
 
 		if (!strcmp(desc->of_match, name)) {
 			of_node_put(search);
-			return of_node_get(child);
+			/*
+			 * 'of_node_get(child)' is already performed by the
+			 * for_each loop.
+			 */
+			return child;
 		}
 	}
 
-- 
2.27.0