linux-kernel - [036/151] x86, mce: dont restart timer if disabled

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Message-Id: <20091217035647.605378154@mini.kroah.org>
Date:	Wed, 16 Dec 2009 19:55:33 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Huang Ying <ying.huang@...el.com>,
	Jan Beulich <jbeulich@...ell.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [036/151] x86, mce: dont restart timer if disabled

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>

commit fe5ed91ddce85a0ed0e4f92c10b099873ef62167 upstream.

Even it is in error path unlikely taken, add_timer_on() at
CPU_DOWN_FAILED* needs to be skipped if mce_timer is disabled.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Huang Ying <ying.huang@...el.com>
Cc: Jan Beulich <jbeulich@...ell.com>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/cpu/mcheck/mce.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1991,9 +1991,11 @@ mce_cpu_callback(struct notifier_block *
 		break;
 	case CPU_DOWN_FAILED:
 	case CPU_DOWN_FAILED_FROZEN:
-		t->expires = round_jiffies(jiffies +
+		if (!mce_ignore_ce && check_interval) {
+			t->expires = round_jiffies(jiffies +
 					   __get_cpu_var(mce_next_interval));
-		add_timer_on(t, cpu);
+			add_timer_on(t, cpu);
+		}
 		smp_call_function_single(cpu, mce_reenable_cpu, &action, 1);
 		break;
 	case CPU_POST_DEAD:


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