linux-kernel - [PATCH] fs/ceph: Move a dereference below a NULL test

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Date:	Sat, 21 Nov 2009 16:53:16 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Sage Weil <sage@...dream.net>, ceph-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] fs/ceph: Move a dereference below a NULL test

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

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://coccinelle.lip6.fr/).

// <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>

---
 fs/ceph/osd_client.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -u -p a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
--- a/fs/ceph/osd_client.c
+++ b/fs/ceph/osd_client.c
@@ -1244,11 +1244,12 @@ int ceph_osdc_writepages(struct ceph_osd
 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
 {
 	struct ceph_osd *osd = con->private;
-	struct ceph_osd_client *osdc = osd->o_osdc;
+	struct ceph_osd_client *osdc;
 	int type = le16_to_cpu(msg->hdr.type);
 
 	if (!osd)
 		return;
+	osdc = osd->o_osdc;
 
 	switch (type) {
 	case CEPH_MSG_OSD_MAP:
--
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