linux-kernel - [PATCH 1/5] drivers/ata: Move a dereference below a NULL test

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Message-ID: <Pine.LNX.4.64.0907110949280.29592@ask.diku.dk>
Date:	Sat, 11 Jul 2009 09:49:48 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/5] drivers/ata: 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>
@@
type T;
expression E;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
  ... when != E
      when != i
  if (E == NULL) S
+ i = E->fld;
// </smpl>

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

---
 drivers/ata/pata_at91.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -u -p a/drivers/ata/pata_at91.c b/drivers/ata/pata_at91.c
--- a/drivers/ata/pata_at91.c
+++ b/drivers/ata/pata_at91.c
@@ -312,11 +312,12 @@ err_ide_ioremap:
 static int __devexit pata_at91_remove(struct platform_device *pdev)
 {
 	struct ata_host *host = dev_get_drvdata(&pdev->dev);
-	struct at91_ide_info *info = host->private_data;
+	struct at91_ide_info *info;
 	struct device *dev = &pdev->dev;
 
 	if (!host)
 		return 0;
+	info = host->private_data;
 
 	ata_host_detach(host);
 
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