cpu hotplug: thermal_throttle: fix cpu hotplug error handling

Do thermal_throttle_add_dev() in CPU_UP_PREPARE instead of CPU_ONLINE.

Cc: Dmitriy Zavin <dmitriyz@google.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Andi Kleen <ak@suse.de>
Cc: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index 494d320..24885be 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -131,17 +131,19 @@ static __cpuinit int thermal_throttle_cpu_callback(struct notifier_block *nfb,
 {
        unsigned int cpu = (unsigned long)hcpu;
        struct sys_device *sys_dev;
-       int err;
+       int err = 0;
 
        sys_dev = get_cpu_sysdev(cpu);
        switch (action) {
-       case CPU_ONLINE:
-       case CPU_ONLINE_FROZEN:
+       case CPU_UP_PREPARE:
+       case CPU_UP_PREPARE_FROZEN:
                mutex_lock(&therm_cpu_lock);
                err = thermal_throttle_add_dev(sys_dev);
                mutex_unlock(&therm_cpu_lock);
                WARN_ON(err);
                break;
+       case CPU_UP_CANCELED:
+       case CPU_UP_CANCELED_FROZEN:
        case CPU_DEAD:
        case CPU_DEAD_FROZEN:
                mutex_lock(&therm_cpu_lock);
@@ -149,7 +151,7 @@ static __cpuinit int thermal_throttle_cpu_callback(struct notifier_block *nfb,
                mutex_unlock(&therm_cpu_lock);
                break;
        }
-       return NOTIFY_OK;
+       return err ? NOTIFY_BAD : NOTIFY_OK;
 }
 
 static struct notifier_block thermal_throttle_cpu_notifier __cpuinitdata =