linux-kernel - [ 132/173] MIPS: Fix poweroff failure when HOTPLUG

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Message-Id: <20121228190357.379548075@decadent.org.uk>
Date:	Fri, 28 Dec 2012 20:05:42 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Huacai Chen <chenhc@...ote.com>,
	Hongliang Tao <taohl@...ote.com>, Hua Yan <yanh@...ote.com>,
	Yong Zhang <yong.zhang@...driver.com>,
	Fuxin Zhang <zhangfx@...ote.com>,
	Zhangjin Wu <wuzhangjin@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: [ 132/173] MIPS: Fix poweroff failure when HOTPLUG_CPU configured.

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Huacai Chen <chenhc@...ote.com>

commit 8add1ecb81f541ef2fcb0b85a5470ad9ecfb4a84 upstream.

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: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Cc: Fuxin Zhang <zhangfx@...ote.com>
Cc: Zhangjin Wu <wuzhangjin@...il.com>
Patchwork: https://patchwork.linux-mips.org/patch/4211/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/mips/kernel/process.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- 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
 		tick_nohz_restart_sched_tick();


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