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From: zhong jiang <zhongjiang@huawei.com>
To: <paulus@samba.org>, <benh@kernel.crashing.org>, <mpe@ellerman.id.au>
Cc: <linuxppc-dev@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH] powerpc: Move a dereference below a NULL test
Date: Wed, 26 Sep 2018 19:46:08 +0800	[thread overview]
Message-ID: <1537962368-14019-1-git-send-email-zhongjiang@huawei.com> (raw)

It is safe to move dereference below a NULL test.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 arch/powerpc/kernel/cacheinfo.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/cacheinfo.c b/arch/powerpc/kernel/cacheinfo.c
index a8f20e5..7f19714 100644
--- a/arch/powerpc/kernel/cacheinfo.c
+++ b/arch/powerpc/kernel/cacheinfo.c
@@ -401,14 +401,13 @@ static struct cache *cache_lookup_or_instantiate(struct device_node *node,
 	struct cache *cache;
 
 	cache = cache_lookup_by_node(node);
+	if (!cache)
+		cache = cache_do_one_devnode(node, level);
 
 	WARN_ONCE(cache && cache->level != level,
 		  "cache level mismatch on lookup (got %d, expected %d)\n",
 		  cache->level, level);
 
-	if (!cache)
-		cache = cache_do_one_devnode(node, level);
-
 	return cache;
 }
 
-- 
1.7.12.4


             reply	other threads:[~2018-09-26 11:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-26 11:46 zhong jiang [this message]
2018-09-26 13:58 ` [PATCH] powerpc: Move a dereference below a NULL test Christophe LEROY
2018-09-26 14:06   ` zhong jiang
2018-09-26 14:22 ` Michal Suchánek
2018-09-26 14:42   ` zhong jiang

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