linux-kernel - [PATCH] Fix uninitialized spinlock of printk

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Message-ID: <87hbm7e6x9.fsf@devron.myhome.or.jp>
Date:	Mon, 17 May 2010 08:57:38 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix uninitialized spinlock of printk_ratelimited()

ratelimit_state initialization of printk_ratelimited() seems
broken. This fixes it by using DEFINE_RATELIMIT_STATE() to initialize
spinlock properly.

Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
---

 include/linux/kernel.h |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff -puN include/linux/kernel.h~printk_ratelimited-fix include/linux/kernel.h
--- linux-2.6/include/linux/kernel.h~printk_ratelimited-fix	2010-05-17 03:37:33.000000000 +0900
+++ linux-2.6-hirofumi/include/linux/kernel.h	2010-05-17 03:37:33.000000000 +0900
@@ -420,14 +420,13 @@ static inline char *pack_hex_byte(char *
  * no local ratelimit_state used in the !PRINTK case
  */
 #ifdef CONFIG_PRINTK
-#define printk_ratelimited(fmt, ...)  ({		\
-	static struct ratelimit_state _rs = {		\
-		.interval = DEFAULT_RATELIMIT_INTERVAL, \
-		.burst = DEFAULT_RATELIMIT_BURST,       \
-	};                                              \
-							\
-	if (__ratelimit(&_rs))                          \
-		printk(fmt, ##__VA_ARGS__);		\
+#define printk_ratelimited(fmt, ...)  ({				\
+	static DEFINE_RATELIMIT_STATE(_rs,				\
+				      DEFAULT_RATELIMIT_INTERVAL,	\
+				      DEFAULT_RATELIMIT_BURST);		\
+									\
+	if (__ratelimit(&_rs))						\
+		printk(fmt, ##__VA_ARGS__);				\
 })
 #else
 /* No effect, but we still get type checking even in the !PRINTK case: */
_
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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