linux-kernel - [PATCH 8/11] drivers/net: Correct NULL test

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Message-ID: <Pine.LNX.4.64.1002060943580.8092@ask.diku.dk>
Date:	Sat, 6 Feb 2010 09:44:15 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Paul Gortmaker <p_gortmaker@...oo.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 8/11] drivers/net: Correct NULL test

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

Test the value that was just allocated rather than the previously tested one.

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

// <smpl>
@r@
expression *x;
expression e;
identifier l;
@@

if (x == NULL || ...) {
    ... when forall
    return ...; }
... when != goto l;
    when != x = e
    when != &x
*x == NULL
// </smpl>

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

---
 drivers/net/ax88796.c               |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ax88796.c b/drivers/net/ax88796.c
index 62d9c9c..1dd4403 100644
--- a/drivers/net/ax88796.c
+++ b/drivers/net/ax88796.c
@@ -921,7 +921,7 @@ static int ax_probe(struct platform_device *pdev)
  		size = (res->end - res->start) + 1;
 
 		ax->mem2 = request_mem_region(res->start, size, pdev->name);
-		if (ax->mem == NULL) {
+		if (ax->mem2 == NULL) {
 			dev_err(&pdev->dev, "cannot reserve registers\n");
 			ret = -ENXIO;
 			goto exit_mem1;
--
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