linux-kernel - [PATCH 3/4] drivers/usb/host/ohci-omap3.c: test the just-initialized value

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Date:	Mon, 22 Aug 2011 16:00:35 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	kernel-janitors@...r.kernel.org, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] drivers/usb/host/ohci-omap3.c: test the just-initialized value

From: Julia Lawall <julia@...u.dk>

Test the just-initialized value rather than some other one.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier x,y,f!={PTR_ERR,ERR_PTR,ERR_CAST};
statement S;
@@

x = f(...);
(
if (\(x == NULL\|IS_ERR(x)\)) S
|
*if (\(y == NULL\|IS_ERR(y)\))
 { ... when != x
   return ...; }
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/usb/host/ohci-omap3.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/ohci-omap3.c b/drivers/usb/host/ohci-omap3.c
index 6048f2f..853ad8d 100644
--- a/drivers/usb/host/ohci-omap3.c
+++ b/drivers/usb/host/ohci-omap3.c
@@ -149,7 +149,7 @@ static int __devinit ohci_hcd_omap3_probe(struct platform_device *pdev)
 
 	res = platform_get_resource_byname(pdev,
 				IORESOURCE_MEM, "ohci");
-	if (!ret) {
+	if (!res) {
 		dev_err(dev, "UHH OHCI get resource failed\n");
 		return -ENOMEM;
 	}

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