linux-kernel - [PATCH 17/20 V2] drivers/net/ethernet/sun/niu.c: fix error return code

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Message-Id: <1349476856-16075-2-git-send-email-peter.senna@gmail.com>
Date:	Sat,  6 Oct 2012 00:40:53 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	davem@...emloft.net
Cc:	mcarlson@...adcom.com, eric.dumazet@...il.com, mchan@...adcom.com,
	shuah.khan@...com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH 17/20 V2] drivers/net/ethernet/sun/niu.c: fix error return code

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

The function niu_pci_init_one() 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_out_free_res:. 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/ethernet/sun/niu.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 8419bf3..275b430 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -9788,6 +9788,7 @@ static int __devinit niu_pci_init_one(struct pci_dev *pdev,
 
 	if (!pci_is_pcie(pdev)) {
 		dev_err(&pdev->dev, "Cannot find PCI Express capability, aborting\n");
+		err = -ENODEV;
 		goto err_out_free_res;
 	}
 

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