* [PATCH v2 2/8] drivers/media/dvb-frontends/lg2160.c: Removes useless kfree()
@ 2012-09-12 12:56 ` Peter Senna Tschudin
0 siblings, 0 replies; 2+ messages in thread
From: Peter Senna Tschudin @ 2012-09-12 12:56 UTC (permalink / raw)
To: Mauro Carvalho Chehab; +Cc: kernel-janitors, linux-media, linux-kernel
From: Peter Senna Tschudin <peter.senna@gmail.com>
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>
---
drivers/media/dvb-frontends/lg2160.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/media/dvb-frontends/lg2160.c b/drivers/media/dvb-frontends/lg2160.c
index cc11260..5fd14f8 100644
--- a/drivers/media/dvb-frontends/lg2160.c
+++ b/drivers/media/dvb-frontends/lg2160.c
@@ -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);
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH v2 2/8] drivers/media/dvb-frontends/lg2160.c: Removes useless kfree()
@ 2012-09-12 12:56 ` Peter Senna Tschudin
0 siblings, 0 replies; 2+ messages in thread
From: Peter Senna Tschudin @ 2012-09-12 12:56 UTC (permalink / raw)
To: Mauro Carvalho Chehab; +Cc: kernel-janitors, linux-media, linux-kernel
From: Peter Senna Tschudin <peter.senna@gmail.com>
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>
---
drivers/media/dvb-frontends/lg2160.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/media/dvb-frontends/lg2160.c b/drivers/media/dvb-frontends/lg2160.c
index cc11260..5fd14f8 100644
--- a/drivers/media/dvb-frontends/lg2160.c
+++ b/drivers/media/dvb-frontends/lg2160.c
@@ -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);
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2012-09-12 12:56 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-09-12 12:56 [PATCH v2 2/8] drivers/media/dvb-frontends/lg2160.c: Removes useless kfree() Peter Senna Tschudin
2012-09-12 12:56 ` Peter Senna Tschudin
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.