linux-kernel - [PATCH] nvmem: sunplus-ocotp: release otp->clk before return

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Message-Id: <20230509085237.5917-1-m202271736@hust.edu.cn>
Date:   Tue,  9 May 2023 16:52:36 +0800
From:   Yi Yingao <m202271736@...t.edu.cn>
To:     Vincent Shih <vincent.sunplus@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     hust-os-kernel-patches@...glegroups.com,
        Yi Yingao <m202271736@...t.edu.cn>,
        Dongliang Mu <dzm91@...t.edu.cn>, linux-kernel@...r.kernel.org
Subject: [PATCH] nvmem: sunplus-ocotp: release otp->clk before return

Smatch reports:
drivers/nvmem/sunplus-ocotp.c:205 sp_ocotp_probe()
warn: 'otp->clk' from clk_prepare() not released on lines: 196.

In the function sp_ocotp_probe(struct platform_device *pdev), otp->clk may
not be released before return.

To fix this issue, using function clk_unprepare() to release otp->clk.

Fixes: 8747ec2e9762 ("nvmem: Add driver for OCOTP in Sunplus SP7021")
Signed-off-by: Yi Yingao <m202271736@...t.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
---
The issue is found by static analysis and the patch remains untested.
---
 drivers/nvmem/sunplus-ocotp.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/nvmem/sunplus-ocotp.c b/drivers/nvmem/sunplus-ocotp.c
index 52b928a7a6d5..f85350b17d67 100644
--- a/drivers/nvmem/sunplus-ocotp.c
+++ b/drivers/nvmem/sunplus-ocotp.c
@@ -192,9 +192,11 @@ static int sp_ocotp_probe(struct platform_device *pdev)
 	sp_ocotp_nvmem_config.dev = dev;
 
 	nvmem = devm_nvmem_register(dev, &sp_ocotp_nvmem_config);
-	if (IS_ERR(nvmem))
-		return dev_err_probe(&pdev->dev, PTR_ERR(nvmem),
+	if (IS_ERR(nvmem)) {
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(nvmem),
 						"register nvmem device fail\n");
+		goto err;
+	}
 
 	platform_set_drvdata(pdev, nvmem);
 
@@ -203,6 +205,9 @@ static int sp_ocotp_probe(struct platform_device *pdev)
 		(int)OTP_WORD_SIZE, (int)QAC628_OTP_SIZE);
 
 	return 0;
+err:
+	clk_unprepare(otp->clk);
+	return ret;
 }
 
 static const struct of_device_id sp_ocotp_dt_ids[] = {
-- 
2.34.1