linux-kernel - [PATCH] drivers: edac: Add missing of_node_put() in altera

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Message-Id: <20220615133413.3967379-1-windhl@126.com>
Date:   Wed, 15 Jun 2022 21:34:13 +0800
From:   Liang He <windhl@....com>
To:     dinguyen@...nel.org, bp@...en8.de, mchehab@...nel.org,
        tony.luck@...el.com, james.morse@....com, rric@...nel.org
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        Liang He <windhl@....com>
Subject: [PATCH] drivers: edac: Add missing of_node_put() in altera_edac.c

In altr_portb_setup(), of_find_compatible_node() will return a node
pointer with refcount incremented. We should use of_node_put() in
fail path or when it is not used anymore.

Signed-off-by: Liang He <windhl@....com>
---
 drivers/edac/altera_edac.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index e7e8e624a436..f035d131751c 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1528,7 +1528,8 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 		edac_printk(KERN_ERR, EDAC_DEVICE,
 			    "%s: Unable to allocate PortB EDAC device\n",
 			    ecc_name);
-		return -ENOMEM;
+		rc = -ENOMEM;
+		goto out_put;
 	}
 
 	/* Initialize the PortB EDAC device structure from PortA structure */
@@ -1536,7 +1537,10 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 	*altdev = *device;
 
 	if (!devres_open_group(&altdev->ddev, altr_portb_setup, GFP_KERNEL))
-		return -ENOMEM;
+	{
+		rc = -ENOMEM;
+		goto out_put;
+	}
 
 	/* Update PortB specific values */
 	altdev->edac_dev_name = ecc_name;
@@ -1605,6 +1609,9 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 		rc = -ENOMEM;
 		goto err_release_group_1;
 	}
+	
+	of_node_put(np);
+	
 	altr_create_edacdev_dbgfs(dci, prv);
 
 	list_add(&altdev->next, &altdev->edac->a10_ecc_devices);
@@ -1618,6 +1625,8 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 	devres_release_group(&altdev->ddev, altr_portb_setup);
 	edac_printk(KERN_ERR, EDAC_DEVICE,
 		    "%s:Error setting up EDAC device: %d\n", ecc_name, rc);
+out_put:
+    of_node_put(np);	
 	return rc;
 }
 
-- 
2.25.1