linux-kernel - [PATCH v2] memory: mtk-smi: add missing put_device() call in mtk_smi_device_link

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Date:   Wed,  1 Jun 2022 16:01:18 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Yong Wu <yong.wu@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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
Cc:     linmq006@...il.com
Subject: [PATCH v2] 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>
---
changes in v2:
- add put_device() in return path -ENODEV.

I don't add put_device in normal path(return 0) because it will set
*com_dev=&smi_com_pdev->dev; and escape to the caller.

v1 link:
https://lore.kernel.org/all/20211230084115.5375-1-linmq006@gmail.com/
---
 drivers/memory/mtk-smi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index 86a3d34f418e..4c5154e0bf00 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -404,13 +404,16 @@ 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);
 		if (!link) {
 			dev_err(dev, "Unable to link smi-common dev\n");
+			put_device(&smi_com_pdev->dev);
 			return -ENODEV;
 		}
 		*com_dev = smi_com_dev;
-- 
2.25.1