linux-kernel - [PATCH 1/3] mfd: syscon: call of_node_put() only when of_parse

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Date: Tue, 20 Feb 2024 11:50:10 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: arnd@...db.de,
	lee@...nel.org,
	thor.thayer@...ux.intel.com
Cc: kernel-team@...roid.com,
	krzysztof.kozlowski@...aro.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	pankaj.dubey@...sung.com,
	tudor.ambarus@...aro.org,
	andre.draszik@...aro.org,
	saravanak@...gle.com,
	willmcvicker@...gle.com,
	Peter Griffin <peter.griffin@...aro.org>
Subject: [PATCH 1/3] mfd: syscon: call of_node_put() only when of_parse_phandle() takes a ref

of_parse_phandle() returns a device_node with refcount incremented, which
the callee needs to call of_node_put() on when done. We should only call
of_node_put() when the property argument is provided though as otherwise
nothing has taken a reference on the node.

Fixes: 45330bb43421 ("mfd: syscon: Allow property as NULL in syscon_regmap_lookup_by_phandle")
Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
---
 drivers/mfd/syscon.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index c9550368d9ea..7d0e91164cba 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -238,7 +238,9 @@ struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
 		return ERR_PTR(-ENODEV);
 
 	regmap = syscon_node_to_regmap(syscon_np);
-	of_node_put(syscon_np);
+
+	if (property)
+		of_node_put(syscon_np);
 
 	return regmap;
 }
-- 
2.44.0.rc0.258.g7320e95886-goog