linux-kernel - [PATCH 10/11] drivers/spi: Move a dereference below a NULL test

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Message-ID: <Pine.LNX.4.64.0812161615090.20444@pc-004.diku.dk>
Date:	Tue, 16 Dec 2008 16:15:31 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	dbrownell@...rs.sourceforge.net,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 10/11] drivers/spi: Move a dereference below a NULL test

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

In each case, 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/spi/pxa2xx_spi.c            |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index cf12f2d..fbad7e4 100644
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -1561,11 +1561,12 @@ out_error_master_alloc:
 static int pxa2xx_spi_remove(struct platform_device *pdev)
 {
 	struct driver_data *drv_data = platform_get_drvdata(pdev);
-	struct ssp_device *ssp = drv_data->ssp;
+	struct ssp_device *ssp;
 	int status = 0;
 
 	if (!drv_data)
 		return 0;
+	ssp = drv_data->ssp;
 
 	/* Remove the queue */
 	status = destroy_queue(drv_data);
--
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