Patchwork [14/37] drivers/net/wireless/ath/ath9k: Use kmemdup

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Submitter Julia Lawall
Date May 15, 2010, 9:17 p.m.
Message ID <Pine.LNX.4.64.1005152316580.21345@ask.diku.dk>
Download mbox | patch
Permalink /patch/52729/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

Julia Lawall - May 15, 2010, 9:17 p.m.
From: Julia Lawall <julia@diku.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@diku.dk>

---
 drivers/net/wireless/ath/ath9k/hif_usb.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

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Patch

diff -u -p a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -901,12 +901,10 @@  static void ath9k_hif_usb_reboot(struct 
 	void *buf;
 	int ret;
 
-	buf = kmalloc(4, GFP_KERNEL);
+	buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
 	if (!buf)
 		return;
 
-	memcpy(buf, &reboot_cmd, 4);
-
 	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
 			   buf, 4, NULL, HZ);
 	if (ret)