linux-kernel - [PATCH] memory: mtk-smi: add missing put_device() call in mtk_smi_device_link

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Message-Id: <20211230084115.5375-1-linmq006@gmail.com>
Date:   Thu, 30 Dec 2021 08:41:15 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linmq006@...il.com, Yong Wu <yong.wu@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ikjoon Jang <ikjn@...omium.org>,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] memory: mtk-smi: add missing put_device() call in mtk_smi_device_link_common

The reference taken by 'of_find_device_by_node()' must be released when
not needed anymore.
Add the corresponding 'put_device()' in the error handling paths.

Fixes: 4740475 ("memory: mtk-smi: Add device link for smi-sub-common")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/memory/mtk-smi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index e201e5976f34..2131f2c9e7ed 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -386,8 +386,10 @@ static int mtk_smi_device_link_common(struct device *dev, struct device **com_de
 	of_node_put(smi_com_node);
 	if (smi_com_pdev) {
 		/* smi common is the supplier, Make sure it is ready before */
-		if (!platform_get_drvdata(smi_com_pdev))
+		if (!platform_get_drvdata(smi_com_pdev)) {
+			put_device(&smi_com_pdev->dev);
 			return -EPROBE_DEFER;
+		}
 		smi_com_dev = &smi_com_pdev->dev;
 		link = device_link_add(dev, smi_com_dev,
 				       DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
-- 
2.17.1