linux-kernel - [PATCH] net: mscc: ocelot: add missing of_node_put after calling of_get_child_by

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Message-Id: <20190929065424.2437-1-wenyang@linux.alibaba.com>
Date:   Sun, 29 Sep 2019 14:54:24 +0800
From:   Wen Yang <wenyang@...ux.alibaba.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        davem@...emloft.net
Cc:     xlpang@...ux.alibaba.com, zhiche.yy@...baba-inc.com,
        Wen Yang <wenyang@...ux.alibaba.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: mscc: ocelot: add missing of_node_put after calling of_get_child_by_name

of_node_put needs to be called when the device node which is got
from of_get_child_by_name finished using.
In both cases of success and failure, we need to release 'ports',
so clean up the code using goto.

fixes: a556c76adc05 ("net: mscc: Add initial Ocelot switch support")
Signed-off-by: Wen Yang <wenyang@...ux.alibaba.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/ethernet/mscc/ocelot_board.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot_board.c b/drivers/net/ethernet/mscc/ocelot_board.c
index b063eb7..aac1151 100644
--- a/drivers/net/ethernet/mscc/ocelot_board.c
+++ b/drivers/net/ethernet/mscc/ocelot_board.c
@@ -388,13 +388,14 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 			continue;
 
 		phy = of_phy_find_device(phy_node);
+		of_node_put(phy_node);
 		if (!phy)
 			continue;
 
 		err = ocelot_probe_port(ocelot, port, regs, phy);
 		if (err) {
 			of_node_put(portnp);
-			return err;
+			goto out_put_ports;
 		}
 
 		phy_mode = of_get_phy_mode(portnp);
@@ -422,7 +423,8 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 				"invalid phy mode for port%d, (Q)SGMII only\n",
 				port);
 			of_node_put(portnp);
-			return -EINVAL;
+			err = -EINVAL;
+			goto out_put_ports;
 		}
 
 		serdes = devm_of_phy_get(ocelot->dev, portnp, NULL);
@@ -435,7 +437,8 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 					"missing SerDes phys for port%d\n",
 					port);
 
-			goto err_probe_ports;
+			of_node_put(portnp);
+			goto out_put_ports;
 		}
 
 		ocelot->ports[port]->serdes = serdes;
@@ -447,9 +450,8 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 
 	dev_info(&pdev->dev, "Ocelot switch probed\n");
 
-	return 0;
-
-err_probe_ports:
+out_put_ports:
+	of_node_put(ports);
 	return err;
 }
 
-- 
1.8.3.1