linux-kernel - [PATCH 8/12] drivers/scsi/fcoe: Correct redundant test

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Message-ID: <Pine.LNX.4.64.0907271814300.2682@ask.diku.dk>
Date:	Mon, 27 Jul 2009 18:14:48 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	linux-scsi@...r.kernel.org, James.Bottomley@...senPartnership.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 8/12] drivers/scsi/fcoe: Correct redundant test

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

The second test is more general than the first one.

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;
position p1,p2;
@@

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/scsi/fcoe/libfcoe.c         |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
index f544340..ab0eb1b 100644
--- a/drivers/scsi/fcoe/libfcoe.c
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -911,8 +911,6 @@ static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
 	u32	desc_mask;
 
 	LIBFCOE_FIP_DBG("Clear Virtual Link received\n");
-	if (!fcf)
-		return;
 	if (!fcf || !fc_host_port_id(lp->host))
 		return;
 
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