linux-kernel - [PATCH] rtc: omap: Handle return value of clk_prepare

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Message-Id: <7bfcac1de9426c3e512a61922bca4239f8b520b5.1496922334.git.arvind.yadav.cs@gmail.com>
Date:   Thu,  8 Jun 2017 17:17:49 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     a.zummo@...ertech.it, alexandre.belloni@...e-electrons.com
Cc:     rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH] rtc: omap: Handle return value of clk_prepare_enable.

- clk_prepare_enable() can fail here and we must check its return value.
- Add missing clk_disable_unprepare(), if omap_rtc_probe is not successful.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
 drivers/rtc/rtc-omap.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 13f7cd1..83b876d 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -705,13 +705,19 @@ static int omap_rtc_probe(struct platform_device *pdev)
 	else
 		rtc->clk = devm_clk_get(&pdev->dev, "int-clk");
 
-	if (!IS_ERR(rtc->clk))
-		clk_prepare_enable(rtc->clk);
+	if (IS_ERR(rtc->clk))
+		return PTR_ERR(rtc->clk);
+
+	ret = clk_prepare_enable(rtc->clk);
+	if (ret)
+		return ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	rtc->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(rtc->base))
-		return PTR_ERR(rtc->base);
+	if (IS_ERR(rtc->base)) {
+		ret = PTR_ERR(rtc->base);
+		goto err_clk;
+	}
 
 	platform_set_drvdata(pdev, rtc);
 
@@ -830,7 +836,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
 	rtc->pctldev = pinctrl_register(&rtc_pinctrl_desc, &pdev->dev, rtc);
 	if (IS_ERR(rtc->pctldev)) {
 		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
-		return PTR_ERR(rtc->pctldev);
+		ret = PTR_ERR(rtc->pctldev);
+		goto err;
 	}
 
 	return 0;
@@ -841,6 +848,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 
+err_clk:
+	clk_disable_unprepare(rtc->clk);
 	return ret;
 }
 
-- 
1.9.1