From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Senna Tschudin Date: Wed, 12 Sep 2012 12:56:03 +0000 Subject: [PATCH v2 2/8] drivers/media/dvb-frontends/lg2160.c: Removes useless kfree() Message-Id: <1347454564-5178-7-git-send-email-peter.senna@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Mauro Carvalho Chehab Cc: kernel-janitors@vger.kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org From: Peter Senna Tschudin 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/) // @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); // Signed-off-by: Peter Senna Tschudin --- 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); From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wg0-f44.google.com ([74.125.82.44]:38091 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758341Ab2ILM40 (ORCPT ); Wed, 12 Sep 2012 08:56:26 -0400 From: Peter Senna Tschudin To: Mauro Carvalho Chehab Cc: kernel-janitors@vger.kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/8] drivers/media/dvb-frontends/lg2160.c: Removes useless kfree() Date: Wed, 12 Sep 2012 14:56:03 +0200 Message-Id: <1347454564-5178-7-git-send-email-peter.senna@gmail.com> Sender: linux-media-owner@vger.kernel.org List-ID: From: Peter Senna Tschudin 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/) // @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); // Signed-off-by: Peter Senna Tschudin --- 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);