netdev - Re: [PATCH 3/9] drivers/net: Eliminate useless code

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Message-ID: <Pine.LNX.4.64.1001180911080.12648@ask.diku.dk>
Date:	Mon, 18 Jan 2010 09:12:21 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	David Miller <davem@...emloft.net>
Cc:	ron.mercer@...gic.com, linux-driver@...gic.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/9] drivers/net: Eliminate useless code

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

The variable qdev is initialized twice to the same (side effect-free)
expression.  Drop one initialization.

A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

// <smpl>
@forall@
idexpression *x;
identifier f!=ERR_PTR;
@@

x = f(...)
... when != x
(
x = f(...,<+...x...+>,...)
|
* x = f(...)
)
// </smpl>

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

---
 drivers/net/qla3xxx.c               |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/net/qla3xxx.c b/drivers/net/qla3xxx.c
index f922294..4ef0afb 100644
--- a/drivers/net/qla3xxx.c
+++ b/drivers/net/qla3xxx.c
@@ -4087,7 +4087,6 @@ static void __devexit ql3xxx_remove(struct pci_dev *pdev)
 	struct ql3_adapter *qdev = netdev_priv(ndev);
 
 	unregister_netdev(ndev);
-	qdev = netdev_priv(ndev);
 
 	ql_disable_interrupts(qdev);
 
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