linux-kernel - [PATCH] timer_list: Correct the show function for timer

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Date:	Mon, 22 Jul 2013 16:18:31 -0500
From:	Nathan Zimmer <nzimmer@....com>
To:	linux-kernel@...r.kernel.org, holger@...yther.de
Cc:	Nathan Zimmer <nzimmer@....com>, <stable@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] timer_list: Correct the show function for timer_list by using iter->now

This patch corrects the issue with /proc/timer_list reported by Holger.
When reading from the proc file with a sufficently small buffer, 2k so not
really that small, there was one could get hung trying to read the file a
chunk at a time.

Signed-off-by Nathan Zimmer <nzimmer@....com>
Reported-by: Holger Hans Peter Freyther <holger@...yther.de>
Cc: <stable@...r.kernel.org> # 3.10.x
Cc: John Stultz <john.stultz@...aro.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/timer_list.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 3bdf283..08d7fbd 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -265,10 +265,9 @@ static inline void timer_list_header(struct seq_file *m, u64 now)
 static int timer_list_show(struct seq_file *m, void *v)
 {
 	struct timer_list_iter *iter = v;
-	u64 now = ktime_to_ns(ktime_get());

 	if (iter->cpu == -1 && !iter->second_pass)
-		timer_list_header(m, now);
+		timer_list_header(m, iter->now);
 	else if (!iter->second_pass)
 		print_cpu(m, iter->cpu, iter->now);
 #ifdef CONFIG_GENERIC_CLOCKEVENTS
-- 
1.8.2.1

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