linux-kernel - [PATCH 1/7] arch/arm/plat-s3c24xx: Move a dereference below a NULL test

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Date:	Fri, 26 Dec 2008 08:26:52 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	ben-linux@...ff.org, linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/7] arch/arm/plat-s3c24xx: Move a dereference below a NULL
 test

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

If the NULL test is necessary, then the dereference should be moved below
the NULL test.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/).

// <smpl>
@disable is_null@
identifier f;
expression E;
identifier fld;
statement S;
@@

+ if (E == NULL) S
  f(...,E->fld,...);
- if (E == NULL) S

@@
identifier f;
expression E;
identifier fld;
statement S;
@@

+ if (!E) S
  f(...,E->fld,...);
- if (!E) S
// </smpl>

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

---
 arch/arm/plat-s3c24xx/dma.c         |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/plat-s3c24xx/dma.c b/arch/arm/plat-s3c24xx/dma.c
index aee2aeb..f95cb02 100644
--- a/arch/arm/plat-s3c24xx/dma.c
+++ b/arch/arm/plat-s3c24xx/dma.c
@@ -227,14 +227,14 @@ s3c2410_dma_loadbuffer(struct s3c2410_dma_chan *chan,
 {
 	unsigned long reload;
 
-	pr_debug("s3c2410_chan_loadbuffer: loading buff %p (0x%08lx,0x%06x)\n",
-		 buf, (unsigned long)buf->data, buf->size);
-
 	if (buf == NULL) {
 		dmawarn("buffer is NULL\n");
 		return -EINVAL;
 	}
 
+	pr_debug("s3c2410_chan_loadbuffer: loading buff %p (0x%08lx,0x%06x)\n",
+		 buf, (unsigned long)buf->data, buf->size);
+
 	/* check the state of the channel before we do anything */
 
 	if (chan->load_state == S3C2410_DMALOAD_1LOADED) {
--
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