linux-kernel - [PATCH 5.15 221/317] mfd: altera-sysmgr: Call of_node_put() only when of_parse

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Message-ID: <20240324233458.1352854-222-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:33:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Peter Griffin <peter.griffin@...aro.org>,
	Lee Jones <lee@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 221/317] mfd: altera-sysmgr: Call of_node_put() only when of_parse_phandle() takes a ref

From: Peter Griffin <peter.griffin@...aro.org>

[ Upstream commit e28c28a34ee9fa2ea671a20e5e7064e6220d55e7 ]

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: f36e789a1f8d ("mfd: altera-sysmgr: Add SOCFPGA System Manager")
Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
Link: https://lore.kernel.org/r/20240220115012.471689-4-peter.griffin@linaro.org
Signed-off-by: Lee Jones <lee@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mfd/altera-sysmgr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/altera-sysmgr.c b/drivers/mfd/altera-sysmgr.c
index 5d3715a28b28e..dbe1009943718 100644
--- a/drivers/mfd/altera-sysmgr.c
+++ b/drivers/mfd/altera-sysmgr.c
@@ -110,7 +110,9 @@ struct regmap *altr_sysmgr_regmap_lookup_by_phandle(struct device_node *np,
 
 	dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver,
 					    (void *)sysmgr_np);
-	of_node_put(sysmgr_np);
+	if (property)
+		of_node_put(sysmgr_np);
+
 	if (!dev)
 		return ERR_PTR(-EPROBE_DEFER);
 
-- 
2.43.0