linux-kernel - [PATCH] rtc: ftrtc010: Fix error handling in ftrtc010_rtc

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Date:   Sun,  3 Apr 2022 05:49:12 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] rtc: ftrtc010: Fix error handling in ftrtc010_rtc_probe

In the error handling path, the clk_prepare_enable() function
call should be balanced by a corresponding 'clk_disable_unprepare()'
call , as already done in the remove function.

clk_disable_unprepare calls clk_disable() and clk_unprepare().
They will use IS_ERR_OR_NULL to check the argument.

Fixes: ac05fba39cc5 ("rtc: gemini: Add optional clock handling")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/rtc/rtc-ftrtc010.c | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/rtc/rtc-ftrtc010.c b/drivers/rtc/rtc-ftrtc010.c
index 53bb08fe1cd4..25c6e7d9570f 100644
--- a/drivers/rtc/rtc-ftrtc010.c
+++ b/drivers/rtc/rtc-ftrtc010.c
@@ -137,26 +137,34 @@ static int ftrtc010_rtc_probe(struct platform_device *pdev)
 		ret = clk_prepare_enable(rtc->extclk);
 		if (ret) {
 			dev_err(dev, "failed to enable EXTCLK\n");
-			return ret;
+			goto err_disable_pclk;
 		}
 	}
 
 	rtc->rtc_irq = platform_get_irq(pdev, 0);
-	if (rtc->rtc_irq < 0)
-		return rtc->rtc_irq;
+	if (rtc->rtc_irq < 0) {
+		ret = rtc->rtc_irq;
+		goto err_disable_extclk;
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
+	if (!res) {
+		ret = -ENODEV;
+		goto err_disable_extclk;
+	}
 
 	rtc->rtc_base = devm_ioremap(dev, res->start,
 				     resource_size(res));
-	if (!rtc->rtc_base)
-		return -ENOMEM;
+	if (!rtc->rtc_base) {
+		ret = -ENOMEM;
+		goto err_disable_extclk;
+	}
 
 	rtc->rtc_dev = devm_rtc_allocate_device(dev);
-	if (IS_ERR(rtc->rtc_dev))
-		return PTR_ERR(rtc->rtc_dev);
+	if (IS_ERR(rtc->rtc_dev)) {
+		ret = PTR_ERR(rtc->rtc_dev);
+		goto err_disable_extclk;
+	}
 
 	rtc->rtc_dev->ops = &ftrtc010_rtc_ops;
 
@@ -172,9 +180,15 @@ static int ftrtc010_rtc_probe(struct platform_device *pdev)
 	ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt,
 			       IRQF_SHARED, pdev->name, dev);
 	if (unlikely(ret))
-		return ret;
+		goto err_disable_extclk;
 
 	return devm_rtc_register_device(rtc->rtc_dev);
+
+err_disable_extclk:
+	clk_disable_unprepare(rtc->extclk);
+err_disable_pclk:
+	clk_disable_unprepare(rtc->pclk);
+	return ret;
 }
 
 static int ftrtc010_rtc_remove(struct platform_device *pdev)
-- 
2.17.1