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cpuidle: coupled: fix sleeping while atomic in cpu notifier 

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.

Signed-off-by: Colin Cross <ccross@android.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Colin Cross 2012-08-15 22:10:50 +02:00 committed by Rafael J. Wysocki
parent 55d7ec4520
commit 63c6ba4352
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);