[PATCH] phy: hisilicon: Fix OF node reference leak

[Haotian Zhang]

hi3670_pcie_get_resources_from_pcie() leaks an OF node reference
obtained by of_get_child_by_name(). The reference is not released
on any of the error paths or on successful return, causing a
reference count leak.

Fix this by declaring the device node with the __free(device_node)
cleanup construct to ensure the reference is automatically released.

Fixes: 73075011ffff ("phy: HiSilicon: Add driver for Kirin 970 PCIe PHY")
Signed-off-by: Haotian Zhang <vulab at iscas.ac.cn>
---
 drivers/phy/hisilicon/phy-hi3670-pcie.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/hisilicon/phy-hi3670-pcie.c b/drivers/phy/hisilicon/phy-hi3670-pcie.c
index dbc7dcce682b..fc4f50aa31cd 100644
--- a/drivers/phy/hisilicon/phy-hi3670-pcie.c
+++ b/drivers/phy/hisilicon/phy-hi3670-pcie.c
@@ -558,11 +558,10 @@ static int hi3670_pcie_noc_power(struct hi3670_pcie_phy *phy, bool enable)
 
 static int hi3670_pcie_get_resources_from_pcie(struct hi3670_pcie_phy *phy)
 {
-	struct device_node *pcie_port;
 	struct device *dev = phy->dev;
 	struct device *pcie_dev;
-
-	pcie_port = of_get_child_by_name(dev->parent->of_node, "pcie");
+	struct device_node *pcie_port __free(device_node) =
+		of_get_child_by_name(dev->parent->of_node, "pcie");
 	if (!pcie_port) {
 		dev_err(dev, "no pcie node found in %s\n",
 			dev->parent->of_node->full_name);
-- 
2.50.1.windows.1