Commit 1a5d2da1 authored Sep 12, 2012 by Peter Senna Tschudin Committed by Mauro Carvalho Chehab Oct 06, 2012

[media] drivers/media/dvb-frontends/lg2160.c: Removes 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: Mauro Carvalho Chehab <mchehab@redhat.com>

parent 3f037426

drivers/media/dvb-frontends/lg2160.c

+2 −6

Original line number	Diff line number	Diff line
		@@ -1421,8 +1421,8 @@ struct dvb_frontend lg2160_attach(const struct lg2160_config config,
		config ? config->i2c_addr : 0);

		state = kzalloc(sizeof(struct lg216x_state), GFP_KERNEL);
		if (state == NULL)
		goto fail;
		if (!state)
		return NULL;

		state->cfg = config;
		state->i2c_adap = i2c_adap;
		@@ -1449,10 +1449,6 @@ struct dvb_frontend lg2160_attach(const struct lg2160_config config,
		state->frontend.dtv_property_cache.atscmh_parade_id = 1;

		return &state->frontend;
		fail:
		lg_warn("unable to detect LG216x hardware\n");
		kfree(state);
		return NULL;
		}
		EXPORT_SYMBOL(lg2160_attach);