linux-kernel - [PATCH] hwspinlock/core: move the dereference below the NULL test

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Date:	Mon, 10 Sep 2012 12:52:02 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	ohad@...ery.com
Cc:	yongjun_wei@...ndmicro.com.cn, linux-kernel@...r.kernel.org
Subject: [PATCH] hwspinlock/core: 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/hwspinlock/hwspinlock_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index 1201a15..db713c0 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -552,7 +552,7 @@ EXPORT_SYMBOL_GPL(hwspin_lock_request_specific);
  */
 int hwspin_lock_free(struct hwspinlock *hwlock)
 {
-	struct device *dev = hwlock->bank->dev;
+	struct device *dev;
 	struct hwspinlock *tmp;
 	int ret;
 
@@ -561,6 +561,7 @@ int hwspin_lock_free(struct hwspinlock *hwlock)
 		return -EINVAL;
 	}
 
+	dev = hwlock->bank->dev;
 	mutex_lock(&hwspinlock_tree_lock);
 
 	/* make sure the hwspinlock is used */

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