linux-kernel - [PATCH 3/12] drivers/mtd: Correct redundant test

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Date:	Mon, 27 Jul 2009 18:13:11 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 3/12] drivers/mtd: Correct redundant test

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

info has already been tested.  It seems that this test should be on the
recently returned value mtd_list.

A simplified version of the semantic match that finds this problem is as
follows: (http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
expression E;
@@

if (x == NULL || ...) { ... when forall
   return ...; }
... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
(
*x == NULL
|
*x != NULL
)
// </smpl>

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

---
 drivers/mtd/maps/physmap_of.c       |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index 39d357b..2cc0b0d 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -215,7 +215,7 @@ static int __devinit of_flash_probe(struct of_device *dev,
 		goto err_out;
 
 	mtd_list = kzalloc(sizeof(struct mtd_info) * count, GFP_KERNEL);
-	if (!info)
+	if (!mtd_list)
 		goto err_out;
 
 	dev_set_drvdata(&dev->dev, info);
--
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