linux-kernel - [PATCH 05/23] pwc: Replace memcpy with struct assignment

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Message-Id: <1351022246-8201-5-git-send-email-elezegarcia@gmail.com>
Date:	Tue, 23 Oct 2012 16:57:08 -0300
From:	Ezequiel Garcia <elezegarcia@...il.com>
To:	<linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>
Cc:	Julia.Lawall@...6.fr, kernel-janitors@...r.kernel.org,
	Ezequiel Garcia <elezegarcia@...il.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH 05/23] pwc: Replace memcpy with struct assignment

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>

Cc: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
Signed-off-by: Ezequiel Garcia <elezegarcia@...il.com>
---
 drivers/media/usb/pwc/pwc-if.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c
index 42e36ba..cc5c7d8 100644
--- a/drivers/media/usb/pwc/pwc-if.c
+++ b/drivers/media/usb/pwc/pwc-if.c
@@ -1003,7 +1003,7 @@ static int usb_pwc_probe(struct usb_interface *intf, const struct usb_device_id
 	vb2_queue_init(&pdev->vb_queue);
 
 	/* Init video_device structure */
-	memcpy(&pdev->vdev, &pwc_template, sizeof(pwc_template));
+	pdev->vdev = pwc_template;
 	strcpy(pdev->vdev.name, name);
 	pdev->vdev.queue = &pdev->vb_queue;
 	pdev->vdev.queue->lock = &pdev->vb_queue_lock;
-- 
1.7.4.4

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