drivers/isdn/gigaset/common.c: Remove useless kfree
authorPeter Senna Tschudin <peter.senna@gmail.com>
Wed, 12 Sep 2012 05:06:47 +0000 (05:06 +0000)
committerDavid S. Miller <davem@davemloft.net>
Thu, 13 Sep 2012 21:05:17 +0000 (17:05 -0400)
commit7f2e6a5d8608d0353b017a0fe15502307593734e
tree62f49c3e8f34bcdbf8869033e92aafc0ca4b84ef
parent5744dd9b71c6b9df944c6a32a000d4a564a2abd7
drivers/isdn/gigaset/common.c: Remove useless kfree

Remove useless kfree() and clean up code related to the removal.

The semantic patch that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
position p1,p2;
expression x;
@@

if (x@p1 == NULL) { ... kfree@p2(x); ... return ...; }

@unchanged exists@
position r.p1,r.p2;
expression e <= r.x,x,e1;
iterator I;
statement S;
@@

if (x@p1 == NULL) { ... when != I(x,...) S
                        when != e = e1
                        when != e += e1
                        when != e -= e1
                        when != ++e
                        when != --e
                        when != e++
                        when != e--
                        when != &e
   kfree@p2(x); ... return ...; }

@ok depends on unchanged exists@
position any r.p1;
position r.p2;
expression x;
@@

... when != true x@p1 == NULL
kfree@p2(x);

@depends on !ok && unchanged@
position r.p2;
expression x;
@@

*kfree@p2(x);
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/isdn/gigaset/common.c