linux-kernel - [PATCH 18/37] drivers/media/video/tlg2300: Use kmemdup

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Date:	Sat, 15 May 2010 23:18:40 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Huang Shijie <shijie8@...il.com>,
	Kang Yong <kangyong@...egent.com>,
	Zhang Xiaobing <xbzhang@...egent.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 18/37] drivers/media/video/tlg2300: Use kmemdup

From: Julia Lawall <julia@...u.dk>

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

-  to = \(kmalloc\|kzalloc\)(size,flag);
+  to = kmemdup(from,size,flag);
   if (to==NULL || ...) S
-  memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/media/video/tlg2300/pd-main.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff -u -p a/drivers/media/video/tlg2300/pd-main.c b/drivers/media/video/tlg2300/pd-main.c
--- a/drivers/media/video/tlg2300/pd-main.c
+++ b/drivers/media/video/tlg2300/pd-main.c
@@ -227,12 +227,11 @@ static int firmware_download(struct usb_
 
 	fwlength = fw->size;
 
-	fwbuf = kzalloc(fwlength, GFP_KERNEL);
+	fwbuf = kmemdup(fw->data, fwlength, GFP_KERNEL);
 	if (!fwbuf) {
 		ret = -ENOMEM;
 		goto out;
 	}
-	memcpy(fwbuf, fw->data, fwlength);
 
 	max_packet_size = udev->ep_out[0x1]->desc.wMaxPacketSize;
 	log("\t\t download size : %d", (int)max_packet_size);
--
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