linux-kernel - [PATCH 9/11] drivers/scsi: Move a dereference below a NULL test

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Date:	Tue, 16 Dec 2008 16:15:08 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	James.Bottomley@...senPartnership.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 9/11] drivers/scsi: 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/scsi/lpfc/lpfc_init.c       |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 909be33..9a01cf0 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -1736,12 +1736,13 @@ lpfc_block_mgmt_io(struct lpfc_hba * phba)
 int
 lpfc_online(struct lpfc_hba *phba)
 {
-	struct lpfc_vport *vport = phba->pport;
+	struct lpfc_vport *vport;
 	struct lpfc_vport **vports;
 	int i;
 
 	if (!phba)
 		return 0;
+	vport = phba->pport;
 
 	if (!(vport->fc_flag & FC_OFFLINE_MODE))
 		return 0;
--
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