linux-kernel - [PATCH 2/11] drivers/infiniband: Move a dereference below a NULL test

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Date:	Tue, 16 Dec 2008 16:12:16 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	rolandd@...co.com, sean.hefty@...el.com, hal.rosenstock@...il.com,
	general@...ts.openfabrics.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 2/11] drivers/infiniband: 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/infiniband/hw/nes/nes_cm.c  |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index 2caf9da..2194ee2 100644
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/drivers/infiniband/hw/nes/nes_cm.c
@@ -376,13 +376,14 @@ int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 		int close_when_complete)
 {
 	unsigned long  flags;
-	struct nes_cm_core *cm_core = cm_node->cm_core;
+	struct nes_cm_core *cm_core;
 	struct nes_timer_entry *new_send;
 	int ret = 0;
 	u32 was_timer_set;
 
 	if (!cm_node)
 		return -EINVAL;
+	cm_core = cm_node->cm_core;
 	new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 	if (!new_send)
 		return -1;
--
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