linux-kernel - [tip:timers/core] timer: Check failure of timer_cpu_notify() before calling init_timer

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Message-ID: <tip-c24a4a369419c360c323865b91198878275c1481@git.kernel.org>
Date:	Tue, 4 Mar 2014 03:33:30 -0800
From:	tip-bot for Viresh Kumar <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	viresh.kumar@...aro.org, tglx@...utronix.de
Subject: [tip:timers/core] timer: Check failure of timer_cpu_notify()
  before calling init_timer_stats()

Commit-ID:  c24a4a369419c360c323865b91198878275c1481
Gitweb:     http://git.kernel.org/tip/c24a4a369419c360c323865b91198878275c1481
Author:     Viresh Kumar <viresh.kumar@...aro.org>
AuthorDate: Fri, 28 Feb 2014 14:15:21 +0530
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 4 Mar 2014 12:30:29 +0100

timer: Check failure of timer_cpu_notify() before calling init_timer_stats()

timer_cpu_notify() should return NOTIFY_OK and nothing else. Anything else would
trigger a BUG_ON(). Return value of this routine is already checked correctly
but is done after issuing a call to init_timer_stats(). The right order would be
to check the error case first and then call init_timer_stats(). Lets do it.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Cc: linaro-kernel@...ts.linaro.org
Cc: fweisbec@...il.com
Cc: tj@...nel.org
Cc: peterz@...radead.org
Link: http://lkml.kernel.org/r/c439f5b6bbc2047e1662f4d523350531425bcf9d.1393576981.git.viresh.kumar@linaro.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/timer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/timer.c b/kernel/timer.c
index a71bdfd..31824ef 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1681,9 +1681,9 @@ void __init init_timers(void)
 
 	err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
 			       (void *)(long)smp_processor_id());
-	init_timer_stats();
-
 	BUG_ON(err != NOTIFY_OK);
+
+	init_timer_stats();
 	register_cpu_notifier(&timers_nb);
 	open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
 }
--
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