linux-kernel - [PATCH 3/3] w1: mxc_w1: Check the clk_prepare

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Date:	Fri, 29 Nov 2013 15:39:30 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	linux-kernel@...r.kernel.org
Cc:	Evgeniy Polyakov <zbr@...emap.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Alexander Shiyan <shc_work@...l.ru>
Subject: [PATCH 3/3] w1: mxc_w1: Check the clk_prepare_enable() return value

Signed-off-by: Alexander Shiyan <shc_work@...l.ru>
---
 drivers/w1/masters/mxc_w1.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c
index 953168c..1e5d94c 100644
--- a/drivers/w1/masters/mxc_w1.c
+++ b/drivers/w1/masters/mxc_w1.c
@@ -108,7 +108,7 @@ static int mxc_w1_probe(struct platform_device *pdev)
 	unsigned long clkrate;
 	struct resource *res;
 	unsigned int clkdiv;
-	int err = 0;
+	int err;
 
 	mdev = devm_kzalloc(&pdev->dev, sizeof(struct mxc_w1_device),
 			    GFP_KERNEL);
@@ -135,20 +135,23 @@ static int mxc_w1_probe(struct platform_device *pdev)
 	if (IS_ERR(mdev->regs))
 		return PTR_ERR(mdev->regs);
 
-	clk_prepare_enable(mdev->clk);
+	err = clk_prepare_enable(mdev->clk);
+	if (err)
+		return err;
+
 	__raw_writeb(clkdiv - 1, mdev->regs + MXC_W1_TIME_DIVIDER);
 
 	mdev->bus_master.data = mdev;
 	mdev->bus_master.reset_bus = mxc_w1_ds2_reset_bus;
 	mdev->bus_master.touch_bit = mxc_w1_ds2_touch_bit;
 
-	err = w1_add_master_device(&mdev->bus_master);
+	platform_set_drvdata(pdev, mdev);
 
+	err = w1_add_master_device(&mdev->bus_master);
 	if (err)
-		return err;
+		clk_disable_unprepare(mdev->clk);
 
-	platform_set_drvdata(pdev, mdev);
-	return 0;
+	return err;
 }
 
 /*
-- 
1.8.3.2

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