[PATCH 3/8] drivers/pcmcia: remove unnecessary kzalloc

Julia Lawall
2009-11-21T11:50:32Z

From: Julia Lawall <julia@diku.dk>

The result of calling kzalloc is never used or freed.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
when != if (...) { <+...x...+> }
(
x->f1 = E
|
(x->f1 == NULL || ...)
|
f(...,x->f1,...)
)
...>
(
return \(0\|<+...x...+>\|ptr\);
|
return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
---
drivers/pcmcia/sa1111_generic.c | 4 ----
1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/drivers/pcmcia/sa1111_generic.c b/drivers/pcmcia/sa1111_generic.c
index deb5036..de6bc33 100644
--- a/drivers/pcmcia/sa1111_generic.c
+++ b/drivers/pcmcia/sa1111_generic.c
@@ -127,10 +127,6 @@ int sa1111_pcmcia_add(struct sa1111_dev *dev, struct pcmcia_low_level *ops,
ops->socket_state = sa1111_pcmcia_socket_state;
ops->socket_suspend = sa1111_pcmcia_socket_suspend;

- s = kzalloc(sizeof(*s) * ops->nr, GFP_KERNEL);
- if (!s)
- return -ENODEV;
-
for (i = 0; i < ops->nr; i++) {
s = kzalloc(sizeof(*s), GFP_KERNEL);
if (!s)