* [PATCH 3/5] drivers/isdn: Move a dereference below a NULL test
@ 2009-07-11 7:50 ` Julia Lawall
0 siblings, 0 replies; 2+ messages in thread
From: Julia Lawall @ 2009-07-11 7:50 UTC (permalink / raw)
To: isdn, isdn4linux, linux-kernel, kernel-janitors
From: Julia Lawall <julia@diku.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://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@diku.dk>
---
drivers/isdn/hysdn/hysdn_net.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -u -p a/drivers/isdn/hysdn/hysdn_net.c b/drivers/isdn/hysdn/hysdn_net.c
--- a/drivers/isdn/hysdn/hysdn_net.c
+++ b/drivers/isdn/hysdn/hysdn_net.c
@@ -187,11 +187,12 @@ void
hysdn_rx_netpkt(hysdn_card * card, unsigned char *buf, unsigned short len)
{
struct net_local *lp = card->netif;
- struct net_device *dev = lp->dev;
+ struct net_device *dev;
struct sk_buff *skb;
if (!lp)
return; /* non existing device */
+ dev = lp->dev;
dev->stats.rx_bytes += len;
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH 3/5] drivers/isdn: Move a dereference below a NULL test
@ 2009-07-11 7:50 ` Julia Lawall
0 siblings, 0 replies; 2+ messages in thread
From: Julia Lawall @ 2009-07-11 7:50 UTC (permalink / raw)
To: isdn, isdn4linux, linux-kernel, kernel-janitors
From: Julia Lawall <julia@diku.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://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@diku.dk>
---
drivers/isdn/hysdn/hysdn_net.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -u -p a/drivers/isdn/hysdn/hysdn_net.c b/drivers/isdn/hysdn/hysdn_net.c
--- a/drivers/isdn/hysdn/hysdn_net.c
+++ b/drivers/isdn/hysdn/hysdn_net.c
@@ -187,11 +187,12 @@ void
hysdn_rx_netpkt(hysdn_card * card, unsigned char *buf, unsigned short len)
{
struct net_local *lp = card->netif;
- struct net_device *dev = lp->dev;
+ struct net_device *dev;
struct sk_buff *skb;
if (!lp)
return; /* non existing device */
+ dev = lp->dev;
dev->stats.rx_bytes += len;
^ permalink raw reply [flat|nested] 2+ messages in thread
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2009-07-11 7:50 [PATCH 3/5] drivers/isdn: Move a dereference below a NULL test Julia Lawall
2009-07-11 7:50 ` Julia Lawall
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