[PATCH 10/10] drivers/net: Move a dereference below a NULL test

From: Julia Lawall
Date: Sun Jul 19 2009 - 11:31:23 EST


From: Julia Lawall <julia@xxxxxxx>

If the NULL test is necessary, then the dereferences 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,E1;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
... when != E=E1
when != i
BUG_ON (E == NULL||...);
+ i = E->fld;
// </smpl>

Signed-off-by: Julia Lawall <julia@xxxxxxx>

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

diff --git a/drivers/net/ibm_newemac/rgmii.c b/drivers/net/ibm_newemac/rgmii.c
index 1d5379d..8d76cb8 100644
--- a/drivers/net/ibm_newemac/rgmii.c
+++ b/drivers/net/ibm_newemac/rgmii.c
@@ -188,11 +188,12 @@ void rgmii_put_mdio(struct of_device *ofdev, int input)
void rgmii_detach(struct of_device *ofdev, int input)
{
struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
- struct rgmii_regs __iomem *p = dev->base;
-
- mutex_lock(&dev->lock);
+ struct rgmii_regs __iomem *p;

BUG_ON(!dev || dev->users == 0);
+ p = dev->base;
+
+ mutex_lock(&dev->lock);

RGMII_DBG(dev, "detach(%d)" NL, input);

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