netdev - [PATCH] caif: move the dereference below the NULL test

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Message-ID: <CAPgLHd-MBQnrU9tS0VFw-O7yvs47r3waHqGm1SRS4GA72Pn1hg@mail.gmail.com>
Date:	Mon, 10 Sep 2012 12:38:27 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	sjur.brandeland@...ricsson.com, davem@...emloft.net
Cc:	yongjun_wei@...ndmicro.com.cn, netdev@...r.kernel.org
Subject: [PATCH] caif: move the dereference below the NULL test

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

The dereference should be moved below the NULL test.

spatch with a semantic match is used to found this.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 net/caif/cfsrvl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/caif/cfsrvl.c b/net/caif/cfsrvl.c
index dd485f6..ba217e9 100644
--- a/net/caif/cfsrvl.c
+++ b/net/caif/cfsrvl.c
@@ -211,9 +211,10 @@ void caif_client_register_refcnt(struct cflayer *adapt_layer,
 					void (*put)(struct cflayer *lyr))
 {
 	struct cfsrvl *service;
-	service = container_of(adapt_layer->dn, struct cfsrvl, layer);
 
-	WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL);
+	if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL))
+		return;
+	service = container_of(adapt_layer->dn, struct cfsrvl, layer);
 	service->hold = hold;
 	service->put = put;
 }

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