linux-kernel - [PATCH] drivers/staging/cpc-usb: Adjust NULL test

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Date:	Wed, 20 May 2009 09:17:11 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	gregkh@...e.de, haas@...-wuensche.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] drivers/staging/cpc-usb: Adjust NULL test

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

Since card must already be non-NULL, it seems that what was intended
was to test the result of kmalloc.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression E,E1;
identifier f,fld,fld1;
statement S1,S2;
@@

E->fld = f(...);
... when != E = E1
    when != E->fld1 = E1
if (
-   E
+   E->fld
           == NULL) S1 else S2
// </smpl>

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

---
 drivers/staging/cpc-usb/cpc-usb_drv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/staging/cpc-usb/cpc-usb_drv.c b/drivers/staging/cpc-usb/cpc-usb_drv.c
--- a/drivers/staging/cpc-usb/cpc-usb_drv.c
+++ b/drivers/staging/cpc-usb/cpc-usb_drv.c
@@ -899,7 +899,7 @@ static int cpcusb_probe(struct usb_inter
 
 	/* allocate and initialize the channel struct */
 	card->chan = kmalloc(sizeof(CPC_CHAN_T), GFP_KERNEL);
-	if (!card) {
+	if (!card->chan) {
 		kfree(card);
 		err("Out of memory");
 		return -ENOMEM;
--
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