linux-kernel - [PATCH] block: move the dereference below the NULL test

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Date:	Fri, 7 Sep 2012 15:04:05 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	grant.likely@...retlab.ca, rob.herring@...xeda.com
Cc:	yongjun_wei@...ndmicro.com.cn, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH] block: 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>
---
 drivers/block/swim3.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index 89ddab1..25a522d 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -1090,13 +1090,14 @@ static const struct block_device_operations floppy_fops = {
 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
 {
 	struct floppy_state *fs = macio_get_drvdata(mdev);
-	struct swim3 __iomem *sw = fs->swim3;
+	struct swim3 __iomem *sw;
 
 	if (!fs)
 		return;
 	if (mb_state != MB_FD)
 		return;
 
+	sw = fs->swim3;
 	/* Clear state */
 	out_8(&sw->intr_enable, 0);
 	in_8(&sw->intr);

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