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From: Ezequiel Garcia <elezegarcia@gmail.com>
To: <linux-kernel@vger.kernel.org>, <linux-media@vger.kernel.org>
Cc: Julia.Lawall@lip6.fr, kernel-janitors@vger.kernel.org,
	Ezequiel Garcia <elezegarcia@gmail.com>,
	Peter Senna Tschudin <peter.senna@gmail.com>
Subject: [PATCH 21/23] dvb-frontends: Replace memcpy with struct assignment
Date: Tue, 23 Oct 2012 16:57:24 -0300	[thread overview]
Message-ID: <1351022246-8201-21-git-send-email-elezegarcia@gmail.com> (raw)
In-Reply-To: <1351022246-8201-1-git-send-email-elezegarcia@gmail.com>

This kind of memcpy() is error-prone. Its replacement with a struct
assignment is prefered because it's type-safe and much easier to read.

Found by coccinelle. Hand patched and reviewed.
Tested by compilation only.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier struct_name;
struct struct_name to;
struct struct_name from;
expression E;
@@
-memcpy(&(to), &(from), E);
+to = from;
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
---
 drivers/media/dvb-frontends/cx24116.c   |    2 +-
 drivers/media/dvb-frontends/drxd_hard.c |    5 ++---
 drivers/media/dvb-frontends/stv0299.c   |    2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/media/dvb-frontends/cx24116.c b/drivers/media/dvb-frontends/cx24116.c
index b488791..2916d7c 100644
--- a/drivers/media/dvb-frontends/cx24116.c
+++ b/drivers/media/dvb-frontends/cx24116.c
@@ -819,7 +819,7 @@ static int cx24116_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 static void cx24116_clone_params(struct dvb_frontend *fe)
 {
 	struct cx24116_state *state = fe->demodulator_priv;
-	memcpy(&state->dcur, &state->dnxt, sizeof(state->dcur));
+	state->dcur = state->dnxt;
 }
 
 /* Wait for LNB */
diff --git a/drivers/media/dvb-frontends/drxd_hard.c b/drivers/media/dvb-frontends/drxd_hard.c
index 6d98537..dca1752 100644
--- a/drivers/media/dvb-frontends/drxd_hard.c
+++ b/drivers/media/dvb-frontends/drxd_hard.c
@@ -2963,7 +2963,7 @@ struct dvb_frontend *drxd_attach(const struct drxd_config *config,
 		return NULL;
 	memset(state, 0, sizeof(*state));
 
-	memcpy(&state->ops, &drxd_ops, sizeof(struct dvb_frontend_ops));
+	state->ops = drxd_ops;
 	state->dev = dev;
 	state->config = *config;
 	state->i2c = i2c;
@@ -2974,8 +2974,7 @@ struct dvb_frontend *drxd_attach(const struct drxd_config *config,
 	if (Read16(state, 0, 0, 0) < 0)
 		goto error;
 
-	memcpy(&state->frontend.ops, &drxd_ops,
-	       sizeof(struct dvb_frontend_ops));
+	state->frontend.ops = drxd_ops;
 	state->frontend.demodulator_priv = state;
 	ConfigureMPEGOutput(state, 0);
 	return &state->frontend;
diff --git a/drivers/media/dvb-frontends/stv0299.c b/drivers/media/dvb-frontends/stv0299.c
index 92a6075..b57ecf4 100644
--- a/drivers/media/dvb-frontends/stv0299.c
+++ b/drivers/media/dvb-frontends/stv0299.c
@@ -420,7 +420,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long
 
 	do_gettimeofday (&nexttime);
 	if (debug_legacy_dish_switch)
-		memcpy (&tv[0], &nexttime, sizeof (struct timeval));
+		tv[0] = nexttime;
 	stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */
 
 	dvb_frontend_sleep_until(&nexttime, 32000);
-- 
1.7.4.4


WARNING: multiple messages have this Message-ID (diff)
From: Ezequiel Garcia <elezegarcia@gmail.com>
To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
Cc: Julia.Lawall@lip6.fr, kernel-janitors@vger.kernel.org,
	Ezequiel Garcia <elezegarcia@gmail.com>,
	Peter Senna Tschudin <peter.senna@gmail.com>
Subject: [PATCH 21/23] dvb-frontends: Replace memcpy with struct assignment
Date: Tue, 23 Oct 2012 19:57:24 +0000	[thread overview]
Message-ID: <1351022246-8201-21-git-send-email-elezegarcia@gmail.com> (raw)
In-Reply-To: <1351022246-8201-1-git-send-email-elezegarcia@gmail.com>

This kind of memcpy() is error-prone. Its replacement with a struct
assignment is prefered because it's type-safe and much easier to read.

Found by coccinelle. Hand patched and reviewed.
Tested by compilation only.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier struct_name;
struct struct_name to;
struct struct_name from;
expression E;
@@
-memcpy(&(to), &(from), E);
+to = from;
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
---
 drivers/media/dvb-frontends/cx24116.c   |    2 +-
 drivers/media/dvb-frontends/drxd_hard.c |    5 ++---
 drivers/media/dvb-frontends/stv0299.c   |    2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/media/dvb-frontends/cx24116.c b/drivers/media/dvb-frontends/cx24116.c
index b488791..2916d7c 100644
--- a/drivers/media/dvb-frontends/cx24116.c
+++ b/drivers/media/dvb-frontends/cx24116.c
@@ -819,7 +819,7 @@ static int cx24116_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 static void cx24116_clone_params(struct dvb_frontend *fe)
 {
 	struct cx24116_state *state = fe->demodulator_priv;
-	memcpy(&state->dcur, &state->dnxt, sizeof(state->dcur));
+	state->dcur = state->dnxt;
 }
 
 /* Wait for LNB */
diff --git a/drivers/media/dvb-frontends/drxd_hard.c b/drivers/media/dvb-frontends/drxd_hard.c
index 6d98537..dca1752 100644
--- a/drivers/media/dvb-frontends/drxd_hard.c
+++ b/drivers/media/dvb-frontends/drxd_hard.c
@@ -2963,7 +2963,7 @@ struct dvb_frontend *drxd_attach(const struct drxd_config *config,
 		return NULL;
 	memset(state, 0, sizeof(*state));
 
-	memcpy(&state->ops, &drxd_ops, sizeof(struct dvb_frontend_ops));
+	state->ops = drxd_ops;
 	state->dev = dev;
 	state->config = *config;
 	state->i2c = i2c;
@@ -2974,8 +2974,7 @@ struct dvb_frontend *drxd_attach(const struct drxd_config *config,
 	if (Read16(state, 0, 0, 0) < 0)
 		goto error;
 
-	memcpy(&state->frontend.ops, &drxd_ops,
-	       sizeof(struct dvb_frontend_ops));
+	state->frontend.ops = drxd_ops;
 	state->frontend.demodulator_priv = state;
 	ConfigureMPEGOutput(state, 0);
 	return &state->frontend;
diff --git a/drivers/media/dvb-frontends/stv0299.c b/drivers/media/dvb-frontends/stv0299.c
index 92a6075..b57ecf4 100644
--- a/drivers/media/dvb-frontends/stv0299.c
+++ b/drivers/media/dvb-frontends/stv0299.c
@@ -420,7 +420,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long
 
 	do_gettimeofday (&nexttime);
 	if (debug_legacy_dish_switch)
-		memcpy (&tv[0], &nexttime, sizeof (struct timeval));
+		tv[0] = nexttime;
 	stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */
 
 	dvb_frontend_sleep_until(&nexttime, 32000);
-- 
1.7.4.4


  parent reply	other threads:[~2012-10-23 19:59 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-23 19:57 [PATCH 01/23] uvc: Replace memcpy with struct assignment Ezequiel Garcia
2012-10-23 19:57 ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 02/23] cx231xx: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 03/23] usbvision: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 04/23] sn9c102: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-24  0:50   ` Ezequiel Garcia
2012-10-24  0:50     ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 05/23] pwc: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 06/23] pvrusb2: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 07/23] hdpvr: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 08/23] cx25840: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 22:20   ` Andy Walls
2012-10-23 22:20     ` Andy Walls
2012-10-23 19:57 ` [PATCH 09/23] zr36067: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 10/23] dvb-usb/friio-fe: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 11/23] au0828: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 12/23] tuners/xc4000: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 13/23] tuners/xc2028: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 22:36   ` Andy Walls
2012-10-23 22:36     ` Andy Walls
2012-10-23 19:57 ` [PATCH 14/23] tuners/tda18271: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 15/23] ivtv: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 22:08   ` Andy Walls
2012-10-23 22:08     ` Andy Walls
2012-10-24  0:28     ` Ezequiel Garcia
2012-10-24  0:28       ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 16/23] cx88: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 17/23] cx23885: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 22:16   ` Andy Walls
2012-10-23 22:16     ` Andy Walls
2012-10-24  0:52     ` Ezequiel Garcia
2012-10-24  0:52       ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 18/23] cx18: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 22:17   ` Andy Walls
2012-10-23 22:17     ` Andy Walls
2012-10-23 19:57 ` [PATCH 19/23] bttv: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 20/23] dvb-core: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` Ezequiel Garcia [this message]
2012-10-23 19:57   ` [PATCH 21/23] dvb-frontends: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 22/23] radio-wl1273: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 23/23] wl128x: " Ezequiel Garcia
2012-10-23 19:57   ` Ezequiel Garcia
2012-10-24 22:35 ` [PATCH 01/23] uvc: " Laurent Pinchart
2012-10-24 22:35   ` Laurent Pinchart
2012-10-24 23:10   ` Andy Walls
2012-10-24 23:10     ` Andy Walls
2012-12-27 21:12 ` Ezequiel Garcia
2012-12-27 21:12   ` Ezequiel Garcia
2012-12-27 23:49   ` Mauro Carvalho Chehab
2012-12-27 23:49     ` Mauro Carvalho Chehab
2013-01-10  0:19     ` Laurent Pinchart
2013-01-10  0:19       ` Laurent Pinchart
2013-01-12 17:44       ` Ezequiel Garcia
2013-01-12 17:44         ` Ezequiel Garcia

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