linux-kernel - [PATCH 1/12] drivers/atm: Correct redundant test

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Date:	Mon, 27 Jul 2009 18:12:34 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	chas@....nrl.navy.mil, linux-atm-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/12] drivers/atm: Correct redundant test

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

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

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/atm/solos-pci.c             |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c
index 9359613..307321b 100644
--- a/drivers/atm/solos-pci.c
+++ b/drivers/atm/solos-pci.c
@@ -372,7 +372,7 @@ static int process_status(struct solos_card *card, int port, struct sk_buff *skb
 	}
 
 	snr = next_string(skb);
-	if (!str)
+	if (!snr)
 		return -EIO;
 	attn = next_string(skb);
 	if (!attn)
--
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