linux-kernel - [PATCH 10/20 V2] drivers/net/irda/sh

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Message-Id: <1349472786-10921-1-git-send-email-peter.senna@gmail.com>
Date:	Fri,  5 Oct 2012 23:33:02 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	samuel@...tiz.org
Cc:	irda-users@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH 10/20 V2] drivers/net/irda/sh_irda.c: fix error return code

From: Peter Senna Tschudin <peter.senna@...il.com>

The function sh_irda_probe() return 0 for success and negative value
for most of its internal tests failures. There is one exception
that is error case going to err_mem_4:. For this error case, the
function abort its success execution path, but returns non negative
value, making it difficult for a caller function to notice the error.

This patch fixes the error case that do not return negative value.

This was found by Coccinelle, but the code change was made by hand.
This patch is not robot generated.

A simplified version of the semantic match that finds this problem is
as follows: (http://coccinelle.lip6.fr/)

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>

---
Change from V1:
        Updated commit message. See:
        http://www.kernelhub.org/?p=2&msg=139319

 drivers/net/irda/sh_irda.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/irda/sh_irda.c b/drivers/net/irda/sh_irda.c
index eb315b8..4b746d9 100644
--- a/drivers/net/irda/sh_irda.c
+++ b/drivers/net/irda/sh_irda.c
@@ -808,8 +808,8 @@ static int __devinit sh_irda_probe(struct platform_device *pdev)
 		goto err_mem_4;
 
 	platform_set_drvdata(pdev, ndev);
-
-	if (request_irq(irq, sh_irda_irq, IRQF_DISABLED, "sh_irda", self)) {
+	err = request_irq(irq, sh_irda_irq, IRQF_DISABLED, "sh_irda", self);
+	if (err) {
 		dev_warn(&pdev->dev, "Unable to attach sh_irda interrupt\n");
 		goto err_mem_4;
 	}

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