linux-kernel - [PATCH 7/11] drivers/net/wireless/ath9k: Move a dereference below a NULL test

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Date:	Tue, 16 Dec 2008 16:14:28 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	lrodriguez@...eros.com, jmalinen@...eros.com,
	linux-wireless@...r.kernel.org, ath9k-devel@...ts.ath9k.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 7/11] drivers/net/wireless/ath9k: 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/net/wireless/ath9k/hw.c     |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index 98bc25c..7d1dac6 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -5581,11 +5581,12 @@ static inline bool ath9k_hw_run_init_cals(struct ath_hal *ah,
 	struct ath9k_channel ichan;
 	bool isCalDone;
 	struct hal_cal_list *currCal = ahp->ah_cal_list_curr;
-	const struct hal_percal_data *calData = currCal->calData;
+	const struct hal_percal_data *calData;
 	int i;
 
 	if (currCal == NULL)
 		return false;
+	calData = currCal->calData;
 
 	ichan.CalValid = 0;
 
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