linux-kernel - [PATCH] MIPS: Fix poweroff failure when HOTPLUG

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Message-Id: <1344823572-28461-1-git-send-email-chenhc@lemote.com>
Date:	Mon, 13 Aug 2012 10:06:12 +0800
From:	Huacai Chen <chenhuacai@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Fuxin Zhang <zhangfx@...ote.com>,
	Zhangjin Wu <wuzhangjin@...il.com>,
	Huacai Chen <chenhc@...ote.com>,
	Hongliang Tao <taohl@...ote.com>, Hua Yan <yanh@...ote.com>,
	Yong Zhang <yong.zhang@...driver.com>, stable@...r.kernel.org
Subject: [PATCH] MIPS: Fix poweroff failure when HOTPLUG_CPU configured.

When poweroff machine, kernel_power_off() call disable_nonboot_cpus().
And if we have HOTPLUG_CPU configured, disable_nonboot_cpus() is not an
empty function but attempt to actually disable the nonboot cpus. Since
system state is SYSTEM_POWER_OFF, play_dead() won't be called and thus
disable_nonboot_cpus() hangs. Therefore, we make this patch to avoid
poweroff failure.

Signed-off-by: Huacai Chen <chenhc@...ote.com>
Signed-off-by: Hongliang Tao <taohl@...ote.com>
Signed-off-by: Hua Yan <yanh@...ote.com>
Cc: Yong Zhang <yong.zhang@...driver.com>
Cc: stable@...r.kernel.org
---
 arch/mips/kernel/process.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index e9a5fd7..69b17a9 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -72,9 +72,7 @@ void __noreturn cpu_idle(void)
 			}
 		}
 #ifdef CONFIG_HOTPLUG_CPU
-		if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map) &&
-		    (system_state == SYSTEM_RUNNING ||
-		     system_state == SYSTEM_BOOTING))
+		if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map))
 			play_dead();
 #endif
 		rcu_idle_exit();
-- 
1.7.7.3

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