* [PATCH v2 1/8] drivers/media/dvb-frontends/dvb_dummy_fe.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/dvb_dummy_fe.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/drivers/media/dvb-frontends/dvb_dummy_fe.c b/drivers/media/dvb-frontends/dvb_dummy_fe.c
index dcfc902..d5acc30 100644
--- a/drivers/media/dvb-frontends/dvb_dummy_fe.c
+++ b/drivers/media/dvb-frontends/dvb_dummy_fe.c
@@ -121,16 +121,13 @@ struct dvb_frontend* dvb_dummy_fe_ofdm_attach(void)
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
- if (state = NULL) goto error;
+ if (!state)
+ return NULL;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &dvb_dummy_fe_ofdm_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
-
-error:
- kfree(state);
- return NULL;
}
static struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops;
@@ -141,16 +138,13 @@ struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void)
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
- if (state = NULL) goto error;
+ if (!state)
+ return NULL;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &dvb_dummy_fe_qpsk_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
-
-error:
- kfree(state);
- return NULL;
}
static struct dvb_frontend_ops dvb_dummy_fe_qam_ops;
@@ -161,16 +155,13 @@ struct dvb_frontend *dvb_dummy_fe_qam_attach(void)
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
- if (state = NULL) goto error;
+ if (!state)
+ return NULL;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &dvb_dummy_fe_qam_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
-
-error:
- kfree(state);
- return NULL;
}
static struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops = {
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH v2 1/8] drivers/media/dvb-frontends/dvb_dummy_fe.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/dvb_dummy_fe.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/drivers/media/dvb-frontends/dvb_dummy_fe.c b/drivers/media/dvb-frontends/dvb_dummy_fe.c
index dcfc902..d5acc30 100644
--- a/drivers/media/dvb-frontends/dvb_dummy_fe.c
+++ b/drivers/media/dvb-frontends/dvb_dummy_fe.c
@@ -121,16 +121,13 @@ struct dvb_frontend* dvb_dummy_fe_ofdm_attach(void)
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
- if (state == NULL) goto error;
+ if (!state)
+ return NULL;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &dvb_dummy_fe_ofdm_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
-
-error:
- kfree(state);
- return NULL;
}
static struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops;
@@ -141,16 +138,13 @@ struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void)
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
- if (state == NULL) goto error;
+ if (!state)
+ return NULL;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &dvb_dummy_fe_qpsk_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
-
-error:
- kfree(state);
- return NULL;
}
static struct dvb_frontend_ops dvb_dummy_fe_qam_ops;
@@ -161,16 +155,13 @@ struct dvb_frontend *dvb_dummy_fe_qam_attach(void)
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
- if (state == NULL) goto error;
+ if (!state)
+ return NULL;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &dvb_dummy_fe_qam_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
-
-error:
- kfree(state);
- return NULL;
}
static struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops = {
^ permalink raw reply related [flat|nested] 2+ messages in thread
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2012-09-12 12:56 [PATCH v2 1/8] drivers/media/dvb-frontends/dvb_dummy_fe.c: Removes useless kfree() Peter Senna Tschudin
2012-09-12 12:56 ` Peter Senna Tschudin
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