linux-kernel - [PATCH 1/5] arch/arm: Correct NULL test

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Date:	Sun, 27 Dec 2009 22:26:54 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/5] arch/arm: Correct NULL test

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

Test the just-allocated value for NULL rather than some other value.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,y;
statement S;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
(
if ((x) == NULL) S
|
if (
-   y
+   x
       == NULL)
 S
)
// </smpl>

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

---
 arch/arm/plat-pxa/dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/arch/arm/plat-pxa/dma.c b/arch/arm/plat-pxa/dma.c
--- a/arch/arm/plat-pxa/dma.c
+++ b/arch/arm/plat-pxa/dma.c
@@ -244,7 +244,7 @@ static void pxa_dma_init_debugfs(void)
 
 	dbgfs_chan = kmalloc(sizeof(*dbgfs_state) * num_dma_channels,
 			     GFP_KERNEL);
-	if (!dbgfs_state)
+	if (!dbgfs_chan)
 		goto err_alloc;
 
 	chandir = debugfs_create_dir("channels", dbgfs_root);
--
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