drivers/char/mmtimer.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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index 33dc2298af73a9118649208df8e75a79bef1bd15..3d6c0671e9965bcd020f81cece6680c3e5dfd726 100644 (file)
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -826,7 +826,7 @@ static int __init mmtimer_init(void)
 
        /* Allocate list of node ptrs to mmtimer_t's */
        timers = kzalloc(sizeof(struct mmtimer_node)*maxn, GFP_KERNEL);
-       if (timers == NULL) {
+       if (!timers) {
                printk(KERN_ERR "%s: failed to allocate memory for device\n",
                                MMTIMER_NAME);
                goto out3;
@@ -848,7 +848,6 @@ static int __init mmtimer_init(void)
        return 0;
 
 out3:
-       kfree(timers);
        misc_deregister(&mmtimer_miscdev);
 out2:
        free_irq(SGI_MMTIMER_VECTOR, NULL);