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From:   Nishka Dasgupta <nishkadg.linux@gmail.com>
To:     agross@kernel.org, kishon@ti.com, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Nishka Dasgupta <nishkadg.linux@gmail.com>
Subject: [PATCH v3] phy: qualcomm: phy-qcom-qmp: Add of_node_put() before return
Date:   Thu,  8 Aug 2019 12:59:37 +0530
Message-Id: <20190808072937.14387-1-nishkadg.linux@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Each iteration of for_each_available_child_of_node() puts the previous
node, but in the case of a return from the middle of the loop, there is
no put, thus causing a memory leak. Hence create a new label,
err_node_put, that puts the previous node (child) before returning the
required value. Also include the statement pm_runtime_disable() under
this label in order to avoid repetition among mid-loop return
conditions. Edit the mid-loop return statements to instead go to this
new label err_node_put.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
---
Changes in v3:
- Add version number.
- Add change log.
Changes in v2:
- Move put and return statements to a label.

 drivers/phy/qualcomm/phy-qcom-qmp.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 34ff6434da8f..e7b8283acce8 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -2093,8 +2093,7 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 		if (ret) {
 			dev_err(dev, "failed to create lane%d phy, %d\n",
 				id, ret);
-			pm_runtime_disable(dev);
-			return ret;
+			goto err_node_put;
 		}
 
 		/*
@@ -2105,8 +2104,7 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 		if (ret) {
 			dev_err(qmp->dev,
 				"failed to register pipe clock source\n");
-			pm_runtime_disable(dev);
-			return ret;
+			goto err_node_put;
 		}
 		id++;
 	}
@@ -2118,6 +2116,11 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 		pm_runtime_disable(dev);
 
 	return PTR_ERR_OR_ZERO(phy_provider);
+
+err_node_put:
+	pm_runtime_disable(dev);
+	of_node_put(child);
+	return ret;
 }
 
 static struct platform_driver qcom_qmp_phy_driver = {
-- 
2.19.1