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cpuidle: coupled: fix sleeping while atomic in cpu notifier

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The cpu hotplug notifier gets called in both atomic and non-atomic
contexts, it is not always safe to lock a mutex.  Filter out all events
except the six necessary ones, which are all sleepable, before taking
the mutex.

Change-Id: I7afa567997f2f3b70b985795026ee92b90657ab5
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Colin Cross 2012-07-24 17:27:10 -07:00 committed by Android Partner Code Review
parent da0c213102
commit a062fa21db
1 changed files with 12 additions and 0 deletions
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12
drivers/cpuidle/coupled.c
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@ -678,6 +678,18 @@ static int cpuidle_coupled_cpu_notify(struct notifier_block *nb,
int cpu = (unsigned long)hcpu;
struct cpuidle_device *dev;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_UP_PREPARE:
case CPU_DOWN_PREPARE:
case CPU_ONLINE:
case CPU_DEAD:
case CPU_UP_CANCELED:
case CPU_DOWN_FAILED:
break;
default:
return NOTIFY_OK;
}
mutex_lock(&cpuidle_lock);
dev = per_cpu(cpuidle_devices, cpu);