[PATCH] I2C-S3C2410: Use common error handling code in s3c24xx_i2c_probe()

[PATCH] I2C-S3C2410: Use common error handling code in s3c24xx_i2c_probe()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 25 Oct 2017 15:00:35 +0200

Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/i2c/busses/i2c-s3c2410.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 5d97510ee48b..304a6d492c8c 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -1168,8 +1168,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	clk_disable(i2c->clk);
 	if (ret != 0) {
 		dev_err(&pdev->dev, "I2C controller init failed\n");
-		clk_unprepare(i2c->clk);
-		return ret;
+		goto unprepare_clock;
 	}
 
 	/*
@@ -1180,24 +1179,21 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 		i2c->irq = ret = platform_get_irq(pdev, 0);
 		if (ret <= 0) {
 			dev_err(&pdev->dev, "cannot find IRQ\n");
-			clk_unprepare(i2c->clk);
-			return ret;
+			goto unprepare_clock;
 		}
 
 		ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq,
 				       0, dev_name(&pdev->dev), i2c);
 		if (ret != 0) {
 			dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
-			clk_unprepare(i2c->clk);
-			return ret;
+			goto unprepare_clock;
 		}
 	}
 
 	ret = s3c24xx_i2c_register_cpufreq(i2c);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
-		clk_unprepare(i2c->clk);
-		return ret;
+		goto unprepare_clock;
 	}
 
 	/*
@@ -1217,12 +1213,15 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	if (ret < 0) {
 		pm_runtime_disable(&pdev->dev);
 		s3c24xx_i2c_deregister_cpufreq(i2c);
-		clk_unprepare(i2c->clk);
-		return ret;
+		goto unprepare_clock;
 	}
 
 	dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
 	return 0;
+
+unprepare_clock:
+	clk_unprepare(i2c->clk);
+	return ret;
 }
 
 static int s3c24xx_i2c_remove(struct platform_device *pdev)
-- 
2.14.3

Re: [PATCH] I2C-S3C2410: Use common error handling code in s3c24xx_i2c_probe()

[Dan Carpenter]

> @@ -1180,24 +1179,21 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
>  		i2c->irq = ret = platform_get_irq(pdev, 0);
>  		if (ret <= 0) {

Not related to this patch, but the comparison here should be < 0.  Or
otherwise we should set an error code.  The bug was introduced in commit
e0d1ec97853f ("i2c-s3c2410: Change IRQ to be plain integer.").

>  			dev_err(&pdev->dev, "cannot find IRQ\n");
> -			clk_unprepare(i2c->clk);
> -			return ret;

regards,
dan carpenter

Re: [PATCH] I2C-S3C2410: Use common error handling code in s3c24xx_i2c_probe()

[Ben Dooks]

On Wed, Oct 25, 2017 at 04:26:20PM +0300, Dan Carpenter wrote:
> > @@ -1180,24 +1179,21 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
> >  		i2c->irq = ret = platform_get_irq(pdev, 0);
> >  		if (ret <= 0) {
> 
> Not related to this patch, but the comparison here should be < 0.  Or
> otherwise we should set an error code.  The bug was introduced in commit
> e0d1ec97853f ("i2c-s3c2410: Change IRQ to be plain integer.").
> 
> >  			dev_err(&pdev->dev, "cannot find IRQ\n");
> > -			clk_unprepare(i2c->clk);
> > -			return ret;
> 
> regards,
> dan carpenter

I believe (ret < 0) { } should be the correct case here.

-- 
Ben Dooks, ben@fluff.org, http://www.fluff.org/ben/

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