linux-kernel - [PATCH] ethernet: fman: add missing put_device() call in mac

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Message-Id: <1638881761-3262-1-git-send-email-wangqing@vivo.com>
Date:   Tue,  7 Dec 2021 04:56:00 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Madalin Bucur <madalin.bucur@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] ethernet: fman: add missing put_device() call in mac_probe()

From: Wang Qing <wangqing@...o.com>

of_find_device_by_node() takes a reference to the embedded struct device 
which needs to be dropped when error return.

Add a jump target to fix the exception handling for this 
function implementation.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/net/ethernet/freescale/fman/mac.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fman/mac.c b/drivers/net/ethernet/freescale/fman/mac.c
index d9fc5c4..5180121
--- a/drivers/net/ethernet/freescale/fman/mac.c
+++ b/drivers/net/ethernet/freescale/fman/mac.c
@@ -668,7 +668,7 @@ static int mac_probe(struct platform_device *_of_dev)
 	if (err) {
 		dev_err(dev, "failed to read cell-index for %pOF\n", dev_node);
 		err = -EINVAL;
-		goto _return_of_node_put;
+		goto _return_of_put_device;
 	}
 	/* cell-index 0 => FMan id 1 */
 	fman_id = (u8)(val + 1);
@@ -677,7 +677,7 @@ static int mac_probe(struct platform_device *_of_dev)
 	if (!priv->fman) {
 		dev_err(dev, "fman_bind(%pOF) failed\n", dev_node);
 		err = -ENODEV;
-		goto _return_of_node_put;
+		goto _return_of_put_device;
 	}
 
 	of_node_put(dev_node);
@@ -758,7 +758,7 @@ static int mac_probe(struct platform_device *_of_dev)
 			dev_err(dev, "of_find_device_by_node(%pOF) failed\n",
 				dev_node);
 			err = -EINVAL;
-			goto _return_of_node_put;
+			goto _return_of_put_device;
 		}
 
 		mac_dev->port[i] = fman_port_bind(&of_dev->dev);
@@ -766,7 +766,7 @@ static int mac_probe(struct platform_device *_of_dev)
 			dev_err(dev, "dev_get_drvdata(%pOF) failed\n",
 				dev_node);
 			err = -EINVAL;
-			goto _return_of_node_put;
+			goto _return_of_put_device;
 		}
 		of_node_put(dev_node);
 	}
@@ -863,6 +863,8 @@ static int mac_probe(struct platform_device *_of_dev)
 
 	goto _return;
 
+_return_of_put_device:
+	put_device(&of_dev->dev);
 _return_of_node_put:
 	of_node_put(dev_node);
 _return_of_get_parent:
-- 
2.7.4