linux-kernel - [PATCH] drivers/mfd: Adjust NULL test

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Message-ID: <Pine.LNX.4.64.0812211907400.9555@pc-004.diku.dk>
Date:	Sun, 21 Dec 2008 19:08:09 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	sameo@...nedhand.com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] drivers/mfd: Adjust NULL test

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

Since ei is already known to be non-NULL, I assume that what was intended
was to test the result of kzalloc.

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/mfd/htc-egpio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/mfd/htc-egpio.c b/drivers/mfd/htc-egpio.c
--- a/drivers/mfd/htc-egpio.c
+++ b/drivers/mfd/htc-egpio.c
@@ -307,7 +307,7 @@ static int __init egpio_probe(struct pla
 
 	ei->nchips = pdata->num_chips;
 	ei->chip = kzalloc(sizeof(struct egpio_chip) * ei->nchips, GFP_KERNEL);
-	if (!ei) {
+	if (!ei->chip) {
 		ret = -ENOMEM;
 		goto fail;
 	}
--
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