linux-kernel - [PATCH 5/5] drivers/staging/tm6000: Correct NULL test

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Message-ID: <Pine.LNX.4.64.0912272227450.20548@ask.diku.dk>
Date:	Sun, 27 Dec 2009 22:28:00 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	gregkh@...e.de, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 5/5] drivers/staging/tm6000: Correct NULL test

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

Test the just-allocated value for NULL rather than some other value.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,y;
statement S;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
(
if ((x) == NULL) S
|
if (
-   y
+   x
       == NULL)
 S
)
// </smpl>

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

---
 drivers/staging/tm6000/tm6000-video.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/staging/tm6000/tm6000-video.c b/drivers/staging/tm6000/tm6000-video.c
--- a/drivers/staging/tm6000/tm6000-video.c
+++ b/drivers/staging/tm6000/tm6000-video.c
@@ -642,7 +642,7 @@ static int tm6000_prepare_isoc(struct tm
 
 	dev->isoc_ctl.transfer_buffer = kmalloc(sizeof(void *)*num_bufs,
 				   GFP_KERNEL);
-	if (!dev->isoc_ctl.urb) {
+	if (!dev->isoc_ctl.transfer_buffer) {
 		tm6000_err("cannot allocate memory for usbtransfer\n");
 		kfree(dev->isoc_ctl.urb);
 		return -ENOMEM;
--
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